Acyl-homoserine-lactone synthase

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Acyl-homoserine-lactone synthase
Identifiers
EC no. 2.3.1.184
CAS no. 176023-66-8
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Acyl-homoserine-lactone synthase (EC 2.3.1.184) is an enzyme with systematic name acyl-(acyl-carrier protein):S-adenosyl-L-methionine acyltranserase (lactone-forming, methylthioadenosine-releasing). [1] [2] [3] [4] [5] [6] [7] [8] [9] This enzyme catalyses the following chemical reaction

Contents

acyl-[acyl-carrier protein] + S-adenosyl-L-methionine [acyl-carrier protein] + S-methyl-5'-thioadenosine + N-acyl-L-homoserine lactone

Acyl-homoserine lactones (AHLs) are produced by a number of bacterial species and are used by them to regulate the expression of virulence genes in a process known as quorum-sensing.

Alternate names

acyl-homoserine lactone synthase, acyl homoserine lactone synthase, acyl-homoserinelactone synthase, acylhomoserine lactone synthase, AHL synthase, AHS, AHSL synthase, AhyI, AinS, AinS protein, autoinducer synthase, autoinducer synthesis protein rhlI, EsaI, ExpISCC1, ExpISCC3065, LasI, LasR, LuxI, LuxI protein, LuxM, N-acyl homoserine lactone synthase, RhlI, YspI, acyl-[acyl carrier protein]:S-adenosyl-L-methionine acyltranserase (lactone-forming, methylthioadenosine-releasing)

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In biology, quorum sensing or quorum signaling (QS) is the ability to detect and respond to cell population density by gene regulation. Quorum sensing is a type of cellular signaling, and more specifically can be considered a type of paracrine signaling. However, it also contains traits of both autocrine signaling: a cell produces both the autoinducer molecule and the receptor for the autoinducer. As one example, QS enables bacteria to restrict the expression of specific genes to the high cell densities at which the resulting phenotypes will be most beneficial, especially for phenotypes that would be ineffective at low cell densities and therefore too energetically costly to express. Many species of bacteria use quorum sensing to coordinate gene expression according to the density of their local population. In a similar fashion, some social insects use quorum sensing to determine where to nest. Quorum sensing in pathogenic bacteria activates host immune signaling and prolongs host survival, by limiting the bacterial intake of nutrients, such as tryptophan, which further is converted to serotonin. As such, quorum sensing allows a commensal interaction between host and pathogenic bacteria. Quorum sensing may also be useful for cancer cell communications.

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Autoinducers are signaling molecules that are produced in response to changes in cell-population density. As the density of quorum sensing bacterial cells increases so does the concentration of the autoinducer. Detection of signal molecules by bacteria acts as stimulation which leads to altered gene expression once the minimal threshold is reached. Quorum sensing is a phenomenon that allows both Gram-negative and Gram-positive bacteria to sense one another and to regulate a wide variety of physiological activities. Such activities include symbiosis, virulence, motility, antibiotic production, and biofilm formation. Autoinducers come in a number of different forms depending on the species, but the effect that they have is similar in many cases. Autoinducers allow bacteria to communicate both within and between different species. This communication alters gene expression and allows bacteria to mount coordinated responses to their environments, in a manner that is comparable to behavior and signaling in higher organisms. Not surprisingly, it has been suggested that quorum sensing may have been an important evolutionary milestone that ultimately gave rise to multicellular life forms.

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

Lactonase (EC 3.1.1.81, acyl-homoserine lactonase; systematic name N-acyl-L-homoserine-lactone lactonohydrolase) is a metalloenzyme, produced by certain species of bacteria, which targets and inactivates acylated homoserine lactones (AHLs). It catalyzes the reaction

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

Autoinducer-2 (AI-2), a furanosyl borate diester or tetrahydroxy furan, is 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">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.

Acyl-homoserine-lactone acylase (EC 3.5.1.97, acyl-homoserine lactone acylase, AHL-acylase, AiiD, N-acyl-homoserine lactone acylase, PA2385 protein, quorum-quenching AHL acylase, quorum-quenching enzyme, PvdQ, QuiP) is an enzyme with systematic name N-acyl-L-homoserine-lactone amidohydrolase. This enzyme functions as a quorum quencher by catalysing the following chemical reaction

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.

References

  1. Schaefer AL, Val DL, Hanzelka BL, Cronan JE, Greenberg EP (September 1996). "Generation of cell-to-cell signals in quorum sensing: acyl homoserine lactone synthase activity of a purified Vibrio fischeri LuxI protein". Proceedings of the National Academy of Sciences of the United States of America. 93 (18): 9505–9. doi: 10.1073/pnas.93.18.9505 . PMC   38458 . PMID   8790360.
  2. Watson WT, Murphy FV, Gould TA, Jambeck P, Val DL, Cronan JE, Beck von Bodman S, Churchill ME (December 2001). "Crystallization and rhenium MAD phasing of the acyl-homoserinelactone synthase EsaI". Acta Crystallographica D. 57 (Pt 12): 1945–9. doi:10.1107/s0907444901014512. PMID   11717525.
  3. Chakrabarti S, Sowdhamini R (April 2003). "Functional sites and evolutionary connections of acylhomoserine lactone synthases". Protein Engineering. 16 (4): 271–8. doi: 10.1093/proeng/gzg031 . PMID   12736370.
  4. Hanzelka BL, Parsek MR, Val DL, Dunlap PV, Cronan JE, Greenberg EP (September 1999). "Acylhomoserine lactone synthase activity of the Vibrio fischeri AinS protein". Journal of Bacteriology. 181 (18): 5766–70. doi:10.1128/JB.181.18.5766-5770.1999. PMC   94098 . PMID   10482519.
  5. Parsek MR, Val DL, Hanzelka BL, Cronan JE, Greenberg EP (April 1999). "Acyl homoserine-lactone quorum-sensing signal generation". Proceedings of the National Academy of Sciences of the United States of America. 96 (8): 4360–5. doi: 10.1073/pnas.96.8.4360 . PMC   16337 . PMID   10200267.
  6. Ulrich RL (October 2004). "Quorum quenching: enzymatic disruption of N-acylhomoserine lactone-mediated bacterial communication in Burkholderia thailandensis". Applied and Environmental Microbiology. 70 (10): 6173–80. doi:10.1128/AEM.70.10.6173-6180.2004. PMC   522112 . PMID   15466564.
  7. Gould TA, Schweizer HP, Churchill ME (August 2004). "Structure of the Pseudomonas aeruginosa acyl-homoserinelactone synthase LasI". Molecular Microbiology. 53 (4): 1135–46. doi: 10.1111/j.1365-2958.2004.04211.x . PMID   15306017.
  8. Raychaudhuri A, Jerga A, Tipton PA (March 2005). "Chemical mechanism and substrate specificity of RhlI, an acylhomoserine lactone synthase from Pseudomonas aeruginosa". Biochemistry. 44 (8): 2974–81. doi:10.1021/bi048005m. PMID   15723540.
  9. Gould TA, Herman J, Krank J, Murphy RC, Churchill ME (January 2006). "Specificity of acyl-homoserine lactone synthases examined by mass spectrometry". Journal of Bacteriology. 188 (2): 773–83. doi:10.1128/JB.188.2.773-783.2006. PMC   1347284 . PMID   16385066.