Bioluminescent bacteria

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Bioluminescent plate Biolumplate.jpg
Bioluminescent plate

Bioluminescent bacteria are light-producing bacteria that are predominantly present in sea water, marine sediments, the surface of decomposing fish and in the gut of marine animals. While not as common, bacterial bioluminescence is also found in terrestrial and freshwater bacteria. [1] These bacteria[ clarification needed ] may be free living (such as Vibrio harveyi ) or in symbiosis with animals such as the Hawaiian Bobtail squid ( Aliivibrio fischeri ) or terrestrial nematodes ( Photorhabdus luminescens ). The host organisms provide these bacteria[ clarification needed ] a safe home and sufficient nutrition. In exchange, the hosts use the light produced by the bacteria for camouflage, prey and/or mate attraction. Bioluminescent bacteria have evolved symbiotic relationships with other organisms in which both participants benefit close to equally. [2] Another possible reason bacteria use luminescence reaction is for quorum sensing, an ability to regulate gene expression in response to bacterial cell density. [3]

Contents

History

Records of bioluminescence due to bacteria have existed for thousands of years. [4] They appear in the folklore of many regions, including Scandinavia and the Indian subcontinent. Both Aristotle and Charles Darwin have described the phenomenon of the oceans glowing. [4] Since its discovery less than 30 years ago, the enzyme luciferase and its regulatory gene, lux, have led to major advances in molecular biology, through use as a reporter gene. [5] Luciferase was first purified by McElroy and Green in 1955. [6] It was later discovered that there were two subunits to luciferase, called subunits α and β. The genes encoding these enzymes, luxA and luxB, respectively, were first isolated in the lux operon of Aliivibrio fisheri [4] .

Purpose of bio-luminescence

The wide-ranged biological purposes of bio-luminescence include but are not limited to attraction of mates, [7] defense against predators, and warning signals. In the case of bioluminescent bacteria, bio-luminescence mainly serves as a form of dispersal. It has been hypothesized that enteric bacteria (bacteria that survive in the guts of other organisms) - especially those prevalent in the depths of the ocean - employ bio-luminescence as an effective form of distribution. [8] After making their way into the digestive tracts of fish and other marine organisms and being excreted in fecal pellets, bioluminescent bacteria are able to utilize their bio-luminescent capabilities to lure in other organisms and prompt ingestion of these bacterial-containing fecal pellets. [9] The bio-luminescence of bacteria thereby ensures their survival, persistence, and dispersal as they are able to enter and inhabit other organisms.

Regulation of bio-luminescence

The regulation of bio-luminescence in bacteria is achieved through the regulation of the oxidative enzyme called luciferase. It is important that bio-luminescent bacteria decrease production rates of luciferase when the population is sparse in number in order to conserve energy. Thus, bacterial bioluminescence is regulated by means of chemical communication referred to as quorum sensing. [10] Essentially, certain signaling molecules named autoinducers [11] with specific bacterial receptors become activated when the population density of bacteria is high enough. The activation of these receptors leads to a coordinated induction of luciferase production that ultimately yields visible luminescence. [12]

Biochemistry of bio-luminescence

Bacterial luciferase consists of two subunits, depicted by the red and blue regions. Bacterial luciferase.png
Bacterial luciferase consists of two subunits, depicted by the red and blue regions.

The chemical reaction that is responsible for bio-luminescence is catalyzed by the enzyme luciferase. In the presence of oxygen, luciferase catalyzes the oxidation of an organic molecule called luciferin. [13] Though bio-luminescence across a diverse range of organisms such as bacteria, insects, and dinoflagellates function in this general manner (utilizing luciferase and luciferin), there are different types of luciferin-luciferase systems. For bacterial bio-luminescence specifically, the biochemical reaction involves the oxidation of an aliphatic aldehyde by a reduced flavin mononucleotide. [14] The products of this oxidation reaction include an oxidized flavin mononucleotide, a fatty acid chain, and energy in the form of a blue-green visible light. [15]

Reaction: FMNH2 + O2 + RCHO → FMN + RCOOH + H2O + light

Evolution of bio-luminescence

Of all light emitters in the ocean, bio-luminescent bacteria is the most abundant and diverse. However, the distribution of bio-luminescent bacteria is uneven, which suggests evolutionary adaptations. The bacterial species in terrestrial genera such as Photorhabdus are bio-luminescent. On the other hand, marine genera with bio-luminescent species such as Vibrio and Shewanella oneidensis have different closely related species that are not light emitters. [16] Nevertheless, all bio-luminescent bacteria share a common gene sequence: the enzymatic oxidation of Aldehyde and reduced Flavin mononucleotide by luciferase which are contained in the lux operon. [17] Bacteria from distinct ecological niches contain this gene sequence; therefore, the identical gene sequence evidently suggests that bio-luminescence bacteria result from evolutionary adaptations.

Use as laboratory tool

After the discovery of the lux operon, the use of bioluminescent bacteria as a laboratory tool is claimed to have revolutionized the area of environmental microbiology. [4] The applications of bioluminescent bacteria include biosensors for detection of contaminants, measurement of pollutant toxicity [4] [18] [19] and monitoring of genetically engineered bacteria released into the environment. [20] [21] [22] Biosensors, created by placing a lux gene construct under the control of an inducible promoter, can be used to determine the concentration of specific pollutants. [4] Biosensors are also able to distinguish between pollutants that are bioavailable and those that are inert and unavailable. [4] For example, Pseudomonas fluorescens has been genetically engineered to be capable of degrading salicylate and naphthalene, and is used as a biosensor to assess the bioavailability of salicylate and naphthalene. [4] Biosensors can also be used as an indicator of cellular metabolic activity and to detect the presence of pathogens. [4]

Evolution

The light-producing chemistry behind bioluminescence varies across the lineages of bioluminescent organisms. [16] Based on this observation, bioluminescence is believed to have evolved independently at least 40 times. [16] In bioluminescent bacteria, the reclassification of the members ofVibrio fischeri species group as a new genus, Aliivibrio, has led to increased interest in the evolutionary origins of bioluminescence [16] . Among bacteria, the distribution of bioluminescent species is polyphyletic. For instance, while all species in the terrestrial genus Photorhabdus are luminescent, the genera Aliivibrio, Photobacterium, Shewanella and Vibrio contain both luminous and non-luminous species. [16] Despite bioluminescence in bacteria not sharing a common origin, they all share a gene sequence in common. The appearance of the highly conserved lux operon in bacteria from very different ecological niches suggests a strong selective advantage despite the high energetic costs of producing light. DNA repair is thought to be the initial selective advantage for light production in bacteria. [16] Consequently, the lux operon may have been lost in bacteria that evolved more efficient DNA repair systems but retained in those where visible light became a selective advantage. [16] [23] The evolution of quorum sensing is believed to have afforded further selective advantage for light production. Quorum sensing allows bacteria to conserve energy by ensuring that they do not synthesize light-producing chemicals unless a sufficient concentration are present to be visible. [16]

Bacterial groups that exhibit bioluminescence

All bacterial species that have been reported to possess bioluminescence belong within the families Vibrionaceae , Shewanellaceae , or Enterobacteriaceae , all of which are assigned to the class Gammaproteobacteria. [24]

FamilyGenusSpecies
Enterobacteriaceae Photorhabdus Photorhabdus asymbiotica

Photorhabdus luminescens

Photorhabdus temperata

Shewanellaceae Shewanella Shewanella woodyi

Shewanella hanedai

Vibrionaceae Aliivibrio Aliivibrio fischeri

Aliivibrio logei

Aliivibrio salmonicida

Aliivibrio sifiae

Aliivibrio "thorii"

Aliivibrio wodanis

Photobacterium Photobacterium aquimaris

Photobacterium damselae

Photobacterium kishitanii

Photobacterium leiognathi

Photobacterium mandapamensis

Photobacterium phosphoreum

Vibrio Vibrio azureus

Vibrio "beijerinckii"

Vibrio campbellii

Vibrio chagasii

Vibrio cholerae

Vibrio harveyi

Vibrio mediterranei

Vibrio orientalis

Vibrio sagamiensis

Vibrio splendidus

Vibrio vulnificus

" Candidatus Photodesmus ""Candidatus  Photodesmus katoptron "

(List from Dunlap and Henryk (2013), "Luminous Bacteria", The Prokaryotes [24] )

Distribution

Bioluminescent bacteria are most abundant in marine environments during spring blooms when there are high nutrient concentrations. These light-emitting organisms are found mainly in coastal waters near the outflow of rivers, such as the northern Adriatic Sea, Gulf of Trieste, northwestern part of the Caspian Sea, coast of Africa and many more. [25] These are known as milky seas. Bioluminescent bacteria are also found in freshwater and terrestrial environments but are less wide spread than in seawater environments. They are found globally, as free-living, symbiotic or parasitic forms [1] and possibly as opportunistic pathogens. [24] Factors that affect the distribution of bioluminescent bacteria include temperature, salinity, nutrient concentration, pH level and solar radiation. [26] For example, Aliivibriofischeri grows favourably in environments that have temperatures between 5 and 30 °C and a pH that is less than 6.8; whereas, Photobacterium phosphoreum thrives in conditions that have temperatures between 5 and 25 °C and a pH that is less than 7.0. [27]

Genetic diversity

All bioluminescent bacteria share a common gene sequence: the lux operon characterized by the luxCDABE gene organization. [24] LuxAB codes for luciferase while luxCDE codes for a fatty-acid reductase complex that is responsible for synthesizing aldehydes for the bioluminescent reaction. Despite this common gene organization, variations, such as the presence of other lux genes, can be observed among species. Based on similarities in gene content and organization, the lux operon can be organized into the following four distinct types: the Aliivibrio/Shewanella type, the Photobacterium type, theVibrio/Candidatus Photodesmus type, and the Photorhabdus type. While this organization follows the genera classification level for members of Vibrionaceae ( Aliivibrio , Photobacterium , and Vibrio ), its evolutionary history is not known. [24]

With the exception of the Photorhabdus operon type, all variants of the lux operon contain the flavin reductase-encoding luxG gene. [24] Most of the Aliivibrio/Shewanella type operons contain additional luxI/luxR regulatory genes that are used for autoinduction during quorum sensing. [28] The Photobacterum operon type is characterized by the presence of rib genes that code for riboflavin, and forms the lux-rib operon. TheVibrio/Candidatus Photodesmus operon type differs from both the Aliivibrio/Shewanella and the Photobacterium operon types in that the operon has no regulatory genes directly associated with it. [24]

Mechanism

All bacterial luciferases are approximately 80 KDa heterodimers containing two subunits: α and β. The α subunit is responsible for light emission. [4] The luxA and luxB genes encode for the α and β subunits, respectively. In most bioluminescent bacteria, the luxA and luxB genes are flanked upstream by luxC and luxD and downstream by luxE. [4]

The bioluminescent reaction is as follows:

FMNH2 + O2 + R-CHO -> FMN + H2O + R-COOH + Light (~ 495 nm)

Molecular oxygen reacts with FMNH2 (reduced flavin mononucleotide) and a long-chain aldehyde to produce FMN (flavin mononucleotide), water and a corresponding fatty acid. The blue-green light emission of bioluminescence, such as that produced by Photobacterium phosphoreum and Vibro harveyi , results from this reaction. [4] Because light emission involves expending six ATP molecules for each photon, it is an energetically expensive process. For this reason, light emission is not constitutively expressed in bioluminescent bacteria; it is expressed only when physiologically necessary.

Quorum sensing

Bacterial quorum sensing Bacterial Quorum Sensing.png
Bacterial quorum sensing

Bioluminescence in bacteria can be regulated through a phenomenon known as autoinduction or quorum sensing. [4] Quorum sensing is a form of cell-to-cell communication that alters gene expression in response to cell density. Autoinducer is a diffusible pheromone produced constitutively by bioluminescent bacteria and serves as an extracellular signalling molecule. [4] When the concentration of autoinducer secreted by bioluminescent cells in the environment reaches a threshold (above 107 cells per mL), it induces the expression of luciferase and other enzymes involved in bioluminescence. [4] Bacteria are able to estimate their density by sensing the level of autoinducer in the environment and regulate their bioluminescence such that it is expressed only when there is a sufficiently high cell population. A sufficiently high cell population ensures that the bioluminescence produced by the cells will be visible in the environment.

A well known example of quorum sensing is that which occurs between Aliivibrio fischeri and its host. This process is regulated by LuxI and LuxR, encoded by luxI and luxR respectively. LuxI is autoinducer synthase that produces autoinducer (AI) while LuxR functions as both a receptor and transcription factor for the lux operon. [4] When LuxR binds AI, LuxR-AI complex activates transcription of the lux operon and induces the expression of luciferase. [28] Using this system, A. fischeri has shown that bioluminescence is expressed only when the bacteria are host-associated and have reached sufficient cell densities. [29]

Another example of quorum sensing by bioluminescent bacteria is by Vibrio harveyi , which are known to be free-living. Unlike Aliivibrio fischeri, V. harveyi do not possess the luxI/luxR regulatory genes and therefore have a different mechanism of quorum sensing regulation. Instead, they use the system known as three-channel quorum sensing system. [30] Vibrio use small non-coding RNAs called Qrr RNAs to regulate quorum sensing, using them to control translation of energy-costly molecules.

Role

The uses of bioluminescence and its biological and ecological significance for animals, including host organisms for bacteria symbiosis, have been widely studied. The biological role and evolutionary history for specifically bioluminescent bacteria still remains quite mysterious and unclear. [4] [31] However, there are continually new studies being done to determine the impacts that bacterial bioluminescence can have on our constantly changing environment and society. Aside from the many scientific and medical uses, scientists have also recently begun to come together with artists and designers to explore new ways of incorporating bioluminescent bacteria, as well as bioluminescent plants, into urban light sources to reduce the need for electricity. [32] They have also begun to use bioluminescent bacteria as a form of art and urban design for the wonder and enjoyment of human society. [33] [34] [35]

One explanation for the role of bacterial bioluminescence is from the biochemical aspect. Several studies have shown the biochemical roles of the luminescence pathway. It can function as an alternate pathway for electron flow under low oxygen concentration, which can be advantageous when no fermentable substrate is available. [1] In this process, light emission is a side product of the metabolism.

Evidence also suggests that bacterial luciferase contributes to the resistance of oxidative stress. In laboratory culture, luxA and luxB mutants of Vibrio harveyi , which lacked luciferase activity, showed impairment of growth under high oxidative stress compared to wild type. The luxD mutants, which had an unaffected luciferase but were unable to produce luminescence, showed little or no difference. This suggests that luciferase mediates the detoxification of reactive oxygen. [36]

Bacterial bioluminescence has also been proposed to be a source of internal light in photoreactivation, a DNA repair process carried out by photolyase. [37] Experiments have shown that non-luminescent V. harveyi mutants are more sensitive to UV irradiation, suggesting the existence of a bioluminescent-mediated DNA repair system. [23]

Another hypothesis, called the "bait hypothesis", is that bacterial bioluminescence attracts predators who will assist in their dispersal. [37] They are either directly ingested by fish or indirectly ingested by zooplankton that will eventually be consumed by higher trophic levels. Ultimately, this may allow passage into the fish gut, a nutrient-rich environment where the bacteria can divide, be excreted, and continue their cycle. Experiments using luminescent Photobacterium leiognathi and non-luminescent mutants have shown that luminescence attracts zooplankton and fish, thus supporting this hypothesis. [37]

Symbiosis with other organisms

The symbiotic relationship between the Hawaiian bobtail squid Euprymna scolopes and the marine gram-negative bacterium Aliivibrio fischeri has been well studied. The two organisms exhibit a mutualistic relationship in which bioluminescence produced by A. fischeri helps to attract prey to the squid host, which provides nutrient-rich tissues and a protected environment for A. fischeri . [38] Bioluminescence provided by A. fischeri also aids in the defense of the squid E. scolopes by providing camouflage during its nighttime foraging activity. [39] Following bacterial colonization, the specialized organs of the squid undergo developmental changes and a relationship becomes established. The squid expels 90% of the bacterial population each morning, because it no longer needs to produce bioluminescence in the daylight. [4] This expulsion benefits the bacteria by aiding in their dissemination. A single expulsion by one bobtail squid produces enough bacterial symbionts to fill 10,000m3 of seawater at a concentration that is comparable to what is found in coastal waters. [39] Thus, in at least some habitats, the symbiotic relationship between A. fischeri and E. scolopes plays a key role in determining the abundance and distribution of E. scolopes. There is a higher abundance of A. fischeri in the vicinity of a population of E. scolopes and this abundance markedly decreases with increasing distance from the host's habitat. [39]

Bioluminescent Photobacterium species also engage in mutually beneficial associations with fish and squid. [40] Dense populations of P. kishitanii, P. leiogathi, and P. mandapamensis can live in the light organs of marine fish and squid, and are provided with nutrients and oxygen for reproduction [40] in return for providing bioluminescence to their hosts, which can aid in sex-specific signaling, predator avoidance, locating or attracting prey, and schooling.[ citation needed ] Interestingly, Meyer-Rochow reported in 1976 that if the fish cannot obtain food and is starving, the light of its bioluminescent symbiont becomes increasingly dim until the light emission stops altogether. [41]

Table of luminous bacterial species in light organ symbiosis with fish and squid
In the table below, the images at the right indicate in blue the locations of the light organ of different families of symbiotically luminous fish and squid. [42] E indicates an external expulsion of the bioluminescent bacteria directly into the seawater. I indicates an internal expulsion of the bioluminescent bacteria in the digestive tract. (E) or (I) indicate a putative localization of the expulsion. [43]
Luminous bacterial species in light organ symbiosis in fish and squid.png

See also

Related Research Articles

<span class="mw-page-title-main">Bonnie Bassler</span> American molecular biologist

Bonnie Lynn Bassler is an American molecular biologist; the Squibb Professor in Molecular Biology and chair of the Department of Molecular Biology at Princeton University; and a Howard Hughes Medical Institute Investigator. She has researched cell-to-cell chemical communication in bacteria and discovered key insights into the mechanism by which bacteria communicate, known as quorum sensing. She has contributed to the idea that disruption of chemical signaling can be used as an antimicrobial therapy.

In biology, quorum sensing or quorum signaling (QS) is the process of cell-to-cell communication that allows bacteria to detect and respond to cell population density by gene regulation, typically as a means of acclimating to environmental disadvantages.

<span class="mw-page-title-main">Bioluminescence</span> Emission of light by a living organism

Bioluminescence is the production and emission of light by living organisms. It is a form of chemiluminescence. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria, and terrestrial arthropods such as fireflies. In some animals, the light is bacteriogenic, produced by symbiotic bacteria such as those from the genus Vibrio; in others, it is autogenic, produced by the animals themselves.

<span class="mw-page-title-main">Luciferase</span> Enzyme family

Luciferase is a generic term for the class of oxidative enzymes that produce bioluminescence, and is usually distinguished from a photoprotein. The name was first used by Raphaël Dubois who invented the words luciferin and luciferase, for the substrate and enzyme, respectively. Both words are derived from the Latin word lucifer, meaning "lightbearer", which in turn is derived from the Latin words for "light" (lux) and "to bring or carry" (ferre).

<span class="mw-page-title-main">Bobtail squid</span> Order cephalopod molluscs closely related to cuttlefish

Bobtail squid are a group of cephalopods closely related to cuttlefish. Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. They have eight suckered arms and two tentacles and are generally quite small.

<i>Aliivibrio fischeri</i> Species of bacterium

Aliivibrio fischeri is a Gram-negative, rod-shaped bacterium found globally in marine environments. This species has bioluminescent properties, and is found predominantly in symbiosis with various marine animals, such as the Hawaiian bobtail squid. It is heterotrophic, oxidase-positive, and motile by means of a single polar flagella. Free-living A. fischeri cells survive on decaying organic matter. The bacterium is a key research organism for examination of microbial bioluminescence, quorum sensing, and bacterial-animal symbiosis. It is named after Bernhard Fischer, a German microbiologist.

<i>Vibrio harveyi</i> Species of bacterium

Vibrio harveyi is a Gram-negative, bioluminescent, marine bacterium in the genus Vibrio. V. harveyi is rod-shaped, motile, facultatively anaerobic, halophilic, and competent for both fermentative and respiratory metabolism. It does not grow below 4 °C. V. harveyi can be found free-swimming in tropical marine waters, commensally in the gut microflora of marine animals, and as both a primary and opportunistic pathogen of marine animals, including Gorgonian corals, oysters, prawns, lobsters, the common snook, barramundi, turbot, milkfish, and seahorses. It is responsible for luminous vibriosis, a disease that affects commercially farmed penaeid prawns. Additionally, based on samples taken by ocean-going ships, V. harveyi is thought to be the cause of the milky seas effect, in which, during the night, a uniform blue glow is emitted from the seawater. Some glows can cover nearly 6,000 sq mi (16,000 km2).

<i>N</i>-Acyl homoserine lactone Class of chemical compounds

N-Acyl homoserine lactones are a class of signaling molecules involved in bacterial quorum sensing, a means of communication between bacteria enabling behaviors based on population density.

Luminescent bacteria emit light as the result of a chemical reaction during which chemical energy is converted to light energy. Luminescent bacteria exist as symbiotic organisms carried within a larger organism, such as many deep sea organisms, including the Lantern Fish, the Angler fish, certain jellyfish, certain clams and the Gulper eel. The light is generated by an enzyme-catalyzed chemoluminescence reaction, wherein the pigment luciferin is oxidised by the enzyme luciferase. The expression of genes related to bioluminescence is controlled by an operon called the lux operon.

<span class="mw-page-title-main">Bioluminescence imaging</span>

Bioluminescence imaging (BLI) is a technology developed over the past decades (1990's and onward). that allows for the noninvasive study of ongoing biological processes Recently, bioluminescence tomography (BLT) has become possible and several systems have become commercially available. In 2011, PerkinElmer acquired one of the most popular lines of optical imaging systems with bioluminescence from Caliper Life Sciences.

<i>Euprymna scolopes</i> Species of cephalopods known as the Hawaiian bobtail squid

Euprymna scolopes, also known as the Hawaiian bobtail squid, is a species of bobtail squid in the family Sepiolidae native to the central Pacific Ocean, where it occurs in shallow coastal waters off the Hawaiian Islands and Midway Island. The type specimen was collected off the Hawaiian Islands and is located at the National Museum of Natural History in Washington, D.C.

In biology, an autoinducer is a signaling molecule that enables detection and response to changes in the population density of bacterial cells. Synthesized when a bacterium reproduces, autoinducers pass outside the bacterium and into the surrounding medium. They are a key component of the phenomenon of quorum sensing: as the density of quorum-sensing bacterial cells increases, so does the concentration of the autoinducer. A bacterium’s detection of an autoinducer above some minimum threshold triggers altered gene expression.

<span class="mw-page-title-main">Autoinducer-2</span> Chemical compound

Autoinducer-2 (AI-2) is a furanosyl borate diester or tetrahydroxy furan that—as the name suggests—is an autoinducer, a member of a family of signaling molecules used in quorum sensing. AI-2 is one of only a few known biomolecules incorporating boron. First identified in the marine bacterium Vibrio harveyi, AI-2 is produced and recognized by many Gram-negative and Gram-positive bacteria. AI-2 arises by the reaction of 4,5-dihydroxy-2,3-pentanedione, which is produced enzymatically, with boric acid and is recognized by the two-component sensor kinase LuxPQ in Vibrionaceae.

<span class="mw-page-title-main">John Woodland Hastings</span>

John Woodland "Woody" Hastings, was a leader in the field of photobiology, especially bioluminescence, and was one of the founders of the field of circadian biology. He was the Paul C. Mangelsdorf Professor of Natural Sciences and Professor of Molecular and Cellular Biology at Harvard University. He published over 400 papers and co-edited three books.

<span class="mw-page-title-main">LuxR-type DNA-binding HTH domain</span>

In molecular biology, the LuxR-type DNA-binding HTH domain is a DNA-binding, helix-turn-helix (HTH) domain of about 65 amino acids. It is present in transcription regulators of the LuxR/FixJ family of response regulators. The domain is named after Vibrio fischeri luxR, a transcriptional activator for quorum-sensing control of luminescence. LuxR-type HTH domain proteins occur in a variety of organisms. The DNA-binding HTH domain is usually located in the C-terminal region of the protein; the N-terminal region often containing an autoinducer-binding domain or a response regulatory domain. Most luxR-type regulators act as transcription activators, but some can be repressors or have a dual role for different sites. LuxR-type HTH regulators control a wide variety of activities in various biological processes.

Interspecies quorum sensing is a type of quorum sensing in which bacteria send and receive signals to other species besides their own. This is accomplished by the secretion of signaling molecules which trigger a response in nearby bacteria at high enough concentrations. Once the molecule hits a certain concentration it triggers the transcription of certain genes such as virulence factors. It has been discovered that bacteria can not only interact via quorum sensing with members of their own species but that there is a kind of universal molecule that allows them to gather information about other species as well. This universal molecule is called autoinducer 2 or AI-2.

Vibrio campbellii is a Gram-negative, curved rod-shaped, marine bacterium closely related to its sister species, Vibrio harveyi. It is an emerging pathogen in aquatic organisms.

Everett Peter Greenberg is an American microbiologist. He is the inaugural Eugene and Martha Nester Professor of Microbiology at the Department of Microbiology of the University of Washington School of Medicine. He is best known for his research on quorum sensing, and has received multiple awards for his work.

Margaret McFall-Ngai is an American animal physiologist and biochemist best-known for her work related to the symbiotic relationship between Hawaiian bobtail squid, Euprymna scolopes and bioluminescent bacteria, Vibrio fischeri. Her research helped expand the microbiology field, primarily focused on pathogenicity and decomposition at the time, to include positive microbial associations. She currently is a professor at PBRC’s Kewalo Marine Laboratory and director of the Pacific Biosciences Research Program at the University of Hawaiʻi at Mānoa.

References

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