A new locus affects cell motility, cellulose binding, and degradation by Cytophaga hutchinsonii.

Abstract:

:Cytophaga hutchinsonii is a Gram-negative gliding bacterium, which can rapidly degrade crystalline cellulose via a novel strategy without any recognizable processive cellulases. Its mechanism of cellulose binding and degradation is still a mystery. In this study, the mutagenesis of C. hutchinsonii with the mariner-based transposon HimarEm3 and gene complementation with the oriC-based plasmid carrying the antibiotic resistance gene cfxA or tetQ were reported for the first time to provide valuable tools for mutagenesis and genetic manipulation of the bacterium. Mutant A-4 with a transposon mutation in gene CHU_0134, which encodes a putative thiol-disulfide isomerase exhibits defects in cell motility and cellulose degradation. The cellulose binding ability of A-4 was only half of that of the wild-type strain, while the endo-cellulase activity of the cell-free supernatants and on the intact cell surface of A-4 decreased by 40%. Sodium dodecyl sulfate polyacrylamide gel electrophoresis of proteins binding to cellulose in the outer membrane showed that most of them were significantly decreased or disappeared in A-4 including some Gld proteins and hypothetical proteins, indicating that these proteins might play an important role in cell motility and cellulose binding and degradation by the bacterium.

authors

Ji X,Xu Y,Zhang C,Chen N,Lu X

doi

10.1007/s00253-012-4051-y

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

161-70

issue

1

eissn

0175-7598

issn

1432-0614

journal_volume

96

pub_type

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