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Appl Environ Microbiol. 2008 Jan;74(1):44-51. Epub 2007 Oct 12.

Conservation of the chitin utilization pathway in the Vibrionaceae.

Author information

1
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 48-417, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Abstract

Vibrionaceae are regarded as important marine chitin degraders, and attachment to chitin regulates important biological functions; yet, the degree of chitin pathway conservation in Vibrionaceae is unknown. Here, a core chitin degradation pathway is proposed based on comparison of 19 Vibrio and Photobacterium genomes with a detailed metabolic map assembled for V. cholerae from published biochemical, genomic, and transcriptomic results. Further, to assess whether chitin degradation is a conserved property of Vibrionaceae, a set of 54 strains from 32 taxa were tested for the ability to grow on various forms of chitin. All strains grew on N-acetylglucosamine (GlcNAc), the monomer of chitin. The majority of isolates grew on alpha (crab shell) and beta (squid pen) chitin and contained chitinase A (chiA) genes. chiA sequencing and phylogenetic analysis suggest that this gene is a good indicator of chitin metabolism but appears subject to horizontal gene transfer and duplication. Overall, chitin metabolism appears to be a core function of Vibrionaceae, but individual pathway components exhibit dynamic evolutionary histories.

PMID:
17933912
PMCID:
PMC2223224
DOI:
10.1128/AEM.01412-07
[Indexed for MEDLINE]
Free PMC Article

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