Kalai Mathee | |
---|---|
Born | 30 August 1959 |
Nationality | Malaysian |
Education | MPH, Health Policy and Management, Florida International University (2018) PhD, Microbiology and Immunology, University of Tennessee, Memphis (1992) Contents
MSc, Microbial Genetics, University of Malaya, Kuala Lumpur, Malaysia (1986) BSc, Genetics, University of Malaya. Kuala Lumpur, Malaysia (1984) |
Spouse | Giri Narasimhan |
Parent(s) | Ka. Kaliaperumal Rugmani Loganayaki |
Scientific career | |
Thesis | Function and regulation of the bacteriophage Mu middle operon (1992) |
Kalai Mathee is a professor at Florida International University, joint editor-in-chief of the Journal of Medical Microbiology , and an elected fellow of the American Academy of Microbiology. She is known for her research on bacterial infections caused by Pseudomonas aeruginosa.
Kalai Mathee was born into a working-class family in Malaysia to Kuyilar Kaliaperumal and Loganayaki. She is of Tamil heritage and got her early education in a vernacular school SJKT Kerajaan in Ipoh. [1] She has a Bachelor of Science in Genetics from the University of Malaya in Kuala Lumpur, graduating in 1984, and completed her master's in molecular genetics focusing on Neisseria gonorrhoeae in 1986 under the tutelage of Chong-Lek Koh. [2] Mathee did her Ph.D. (1992) at the University of Tennessee Health Science Center at Memphis under Martha Howe's guidance specializing in transcription. [3] Mathee did two post-doctorate fellowships, one at Tufts University focusing on Helicobacter pylori pathogenesis in the year 1993; the other at University of Tennessee Health Science Center working on Pseudomonas aeruginosa pathogenesis from 1993-1999. In 2018, she received her master's degree in Public Health in Health Policy and Management from Florida International University.
In 1999, Mathee moved to Florida International University where she was promoted to professor in 2013. She did a sabbatical at Harvard Medical School in Stephen Lory’s lab from 2006-2007. [1] In 2007 she was the founding chair of the Department of Molecular Microbiology and Infectious Diseases at Florida International University. [2]
In 2017, Mathee and Norman Fry were named co-editors-in-cChief of the Journal of Medical Microbiology. [4] [5]
Since 1993, the major focus of Mathee’s research has been the pathobiology of Pseudomonas aeruginosa chronic infections with specific emphasis on β-lactam resistance, alginate overproduction, comparative genomics, alternative therapies, and cystic fibrosis lung ecology. Her early research identified the function and regulatory mechanisms of the bacteriophage Mu. [6] [7] Her postdoctoral research focused on alginate gene regulation with a focus on the alginate-specific sigma factor, AlgT/U, and she was the first to show MucA is an inner membrane protein. [8] Mathee also showed that polymorphonuclear leukocytes and oxygen radicals can contribute to mucoid conversion by Pseudomonas aeruginosa. [9] Mathee has examined the role of quorum sensing molecules in Pseudomonas aeruginosa infections, [10] [11] [12] and demonstrated that alginate is not required for biofilm formation. [13] Her work has used comparative genomics [14] and transcriptomics [15] to define variability across strains of Pseudomonas aeruginosa. A portion of Mathee's research is on β-lactam resistance, [16] particularly the amp pathway where she showed the presence of a β-lactamase PoxB, two permeases, and coregulation of antibiotic resistance and other virulence factors mediated by AmpR. [17] [18] Current ongoing research focuses on exploring various microbiomes, including lung, irritable bowel syndrome, vaginal, and gut. [19]
In 2011, she was awarded the President’s Council Worlds Ahead Faculty Award from Florida International University. [20] Mathee was named a distinguished fellow of the Malaysian Biotechnology Information Centre in 2013. [21] In 2014, she was one of the inaugural recipients of the New England Biolabs Passion in Science Award. [22] In 2020, Mathee was elected a fellow of the American Academy of Microbiology. [23] Mathee is the first Florida International University faculty member to receive this honor, and the first Malaysian woman to receive this honor. [24] In 2022 she was awarded the Microbiology Society's Microbiology Outreach Prize. [25]
In 1993, she married a computer science professor, Giri Narasimhan, in Nashville, Tennessee.[ citation needed ]
A biofilm is a syntrophic community of microorganisms in which cells stick to each other and often also to a surface. These adherent cells become embedded within a slimy extracellular matrix that is composed of extracellular polymeric substances (EPSs). The cells within the biofilm produce the EPS components, which are typically a polymeric combination of extracellular polysaccharides, proteins, lipids and DNA. Because they have a three-dimensional structure and represent a community lifestyle for microorganisms, they have been metaphorically described as "cities for microbes".
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.
Pseudomonas is a genus of Gram-negative bacteria belonging to the family Pseudomonadaceae in the class Gammaproteobacteria. The 313 members of the genus demonstrate a great deal of metabolic diversity and consequently are able to colonize a wide range of niches. Their ease of culture in vitro and availability of an increasing number of Pseudomonas strain genome sequences has made the genus an excellent focus for scientific research; the best studied species include P. aeruginosa in its role as an opportunistic human pathogen, the plant pathogen P. syringae, the soil bacterium P. putida, and the plant growth-promoting P. fluorescens, P. lini, P. migulae, and P. graminis.
Pseudomonas aeruginosa is a common encapsulated, Gram-negative, aerobic–facultatively anaerobic, rod-shaped bacterium that can cause disease in plants and animals, including humans. A species of considerable medical importance, P. aeruginosa is a multidrug resistant pathogen recognized for its ubiquity, its intrinsically advanced antibiotic resistance mechanisms, and its association with serious illnesses – hospital-acquired infections such as ventilator-associated pneumonia and various sepsis syndromes. P. aeruginosa is able to selectively inhibit various antibiotics from penetrating its outer membrane - and has high resistance to several antibiotics. According to the World Health Organization P. aeruginosa poses one of the greatest threats to humans in terms of antibiotic resistance.
Swarming motility is a rapid and coordinated translocation of a bacterial population across solid or semi-solid surfaces, and is an example of bacterial multicellularity and swarm behaviour. Swarming motility was first reported by Jorgen Henrichsen and has been mostly studied in genus Serratia, Salmonella, Aeromonas, Bacillus, Yersinia, Pseudomonas, Proteus, Vibrio and Escherichia.
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
Pyocyanin (PCN−) is one of the many toxic compounds produced and secreted by the Gram negative bacterium Pseudomonas aeruginosa. Pyocyanin is a blue secondary metabolite, turning red below pH 4.9, with the ability to oxidise and reduce other molecules and therefore kill microbes competing against P. aeruginosa as well as mammalian cells of the lungs which P. aeruginosa has infected during cystic fibrosis. Since pyocyanin is a zwitterion at blood pH, it is easily able to cross the cell membrane. There are three different states in which pyocyanin can exist: oxidized (blue), monovalently reduced (colourless) or divalently reduced (red). Mitochondria play an important role in the cycling of pyocyanin between its redox states. Due to its redox-active properties, pyocyanin generates reactive oxygen species.
Roberto Kolter is Professor of Microbiology, Emeritus at Harvard Medical School, an author, and past president of the American Society for Microbiology. Kolter has been a professor at Harvard Medical School since 1983 and was Co-director of Harvard's Microbial Sciences Initiative from 2003-2018. During the 35-year term of the Kolter laboratory from 1983 to 2018, more than 130 graduate students and postdoctoral trainees explored an eclectic mix of topics gravitating around the study of microbes. Kolter is a fellow of the American Association for the Advancement of Science and of the American Academy of Microbiology.
Pyoverdines are fluorescent siderophores produced by certain pseudomonads. Pyoverdines are important virulence factors, and are required for pathogenesis in many biological models of infection. Their contributions to bacterial pathogenesis include providing a crucial nutrient, regulation of other virulence factors, supporting the formation of biofilms, and are increasingly recognized for having toxicity themselves.
Rhamnolipids are a class of glycolipid produced by Pseudomonas aeruginosa, amongst other organisms, frequently cited as bacterial surfactants. They have a glycosyl head group, in this case a rhamnose moiety, and a 3-(hydroxyalkanoyloxy)alkanoic acid (HAA) fatty acid tail, such as 3-hydroxydecanoic acid.
Bacterial morphological plasticity refers to changes in the shape and size that bacterial cells undergo when they encounter stressful environments. Although bacteria have evolved complex molecular strategies to maintain their shape, many are able to alter their shape as a survival strategy in response to protist predators, antibiotics, the immune response, and other threats.
Acyl-homoserine-lactone synthase is an enzyme with systematic name acyl-(acyl-carrier protein):S-adenosyl-L-methionine acyltranserase . This enzyme catalyses the following chemical reaction
Delftia tsuruhatensis is a Gram-negative, rod-shaped, catalase- and oxidase-positive, motile bacterium from the Comamonadaceae family. It was first isolated from a wastewater treatment plant in Japan in 2003. D. tsuruhatensis is an opportunistic and emergent pathogen. All documented human infections are healthcare-associated.
The Catabolite repression control (Crc) protein participates in suppressing expression of several genes involved in utilization of carbon sources in Pseudomonas bacteria. Presence of organic acids triggers activation of Crc and in conjunction with the Hfq protein genes that metabolize a given carbon source are downregulated until another more favorable carbon source is depleted. Crc-mediated regulation impact processes such as biofilm formation, virulence and antibiotic susceptibility.
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.
Twitching motility is a form of crawling bacterial motility used to move over surfaces. Twitching is mediated by the activity of hair-like filaments called type IV pili which extend from the cell's exterior, bind to surrounding solid substrates, and retract, pulling the cell forwards in a manner similar to the action of a grappling hook. The name twitching motility is derived from the characteristic jerky and irregular motions of individual cells when viewed under the microscope. It has been observed in many bacterial species, but is most well studied in Pseudomonas aeruginosa, Neisseria gonorrhoeae and Myxococcus xanthus. Active movement mediated by the twitching system has been shown to be an important component of the pathogenic mechanisms of several species.
Jessica A. Scoffield is an American microbiologist and an assistant professor in the Department of Microbiology at the University of Alabama at Birmingham School of Medicine. Scoffield studies the mechanisms by which oral commensal bacteria interfere with pathogenic bacterial growth in order to inform the development of active therapeutic tools to prevent drug resistant pathogen infection. In 2019, Scoffield became the inaugural recipient of the American Association for Dental Research Procter and Gamble Underrepresented Faculty Research Fellowship.
Niels Høiby is a Danish physician, professor and politician. He specialises in microbiology and was a pioneer in the study of biofilms and their role in conditions such as cystic fibrosis. He worked for many years as a department head at Denmark's largest hospital, the Rigshospitalet.
Diffusible signal factor (DSF) is found in several gram-negative bacteria and play a role in the formation of biofilms, motility, virulence, and antibiotic resistance. Xanthomonas campestris was the first bacteria known to have DSF. The synthesis of the DSF can be seen in rpfF and rpfB enzymes. An understanding of the DSF signaling mechanism could lead to further disease control.
The molecule 2-heptyl-3-hydroxy-4-quinolone, also named the Pseudomonas quinolone signal (PQS), has been discovered as an intracellular link between the two major quorum sensing systems of P. aeruginosa; the las and rhl systems. These systems together control expression of virulence factors and play a major role in the formation of biofilms in Pseudomonas aeruginosa. P. aeruginosa is a gram-negative bacteria and opportunistic human pathogen that can cause serious and sometimes fatal infections in humans. Similar to other bacterial species, P. aeruginosa uses quorum sensing (QS) systems to communicate between cells in a population. This allows coordination of gene expression in a population based on changing cell densities, abundance of nutrients, and other environmental factors.
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