Document Detail

Squid-derived chitin oligosaccharides are a chemotactic signal during colonization by Vibrio fischeri.
MedLine Citation:
PMID:  22522684     Owner:  NLM     Status:  MEDLINE    
Chitin, a polymer of N-acetylglucosamine (GlcNAc), is noted as the second most abundant biopolymer in nature. Chitin serves many functions for marine bacteria in the family Vibrionaceae ("vibrios"), in some instances providing a physical attachment site, inducing natural genetic competence, and serving as an attractant for chemotaxis. The marine luminous bacterium Vibrio fischeri is the specific symbiont in the light-emitting organ of the Hawaiian bobtail squid, Euprymna scolopes. The bacterium provides the squid with luminescence that the animal uses in an antipredatory defense, while the squid supports the symbiont's nutritional requirements. V. fischeri cells are harvested from seawater during each host generation, and V. fischeri is the only species that can complete this process in nature. Furthermore, chitin is located in squid hemocytes and plays a nutritional role in the symbiosis. We demonstrate here that chitin oligosaccharides produced by the squid host serve as a chemotactic signal for colonizing bacteria. V. fischeri uses the gradient of host chitin to enter the squid light organ duct and colonize the animal. We provide evidence that chitin serves a novel function in an animal-bacterial mutualism, as an animal-produced bacterium-attracting synomone.
Mark J Mandel; Amy L Schaefer; Caitlin A Brennan; Elizabeth A C Heath-Heckman; Cindy R Deloney-Marino; Margaret J McFall-Ngai; Edward G Ruby
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-04-20
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  78     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-06-08     Completed Date:  2012-09-28     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4620-6     Citation Subset:  IM    
Department of Medical Microbiology and Immunology, University of Wisconsin, Madison, USA.
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MeSH Terms
Aliivibrio fischeri / growth & development,  metabolism,  physiology*
Chemotactic Factors / metabolism*
Chitin / metabolism*
Decapodiformes / metabolism,  microbiology*
Oligosaccharides / metabolism*
Grant Support
Reg. No./Substance:
0/Chemotactic Factors; 0/Oligosaccharides; 1398-61-4/Chitin

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