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. 1990 Jun;172(6):3117–3124. doi: 10.1128/jb.172.6.3117-3124.1990

Use of nonmotile mutants to identify a set of membrane proteins related to gliding motility in Cytophaga johnsonae.

J L Pate 1, D M De Jong 1
PMCID: PMC209115  PMID: 2345138

Abstract

Nonmotile mutants of the gliding bacterium Cytophaga johnsonae were examined to identify proteins that might be involved in gliding motility. Wild-type and mutant cell proteins were solubilized and fractionated by using Triton X-114, and the proteins that partitioned into the aqueous phase or the detergent phase were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis for proteins that differed between wild-type and mutant cells. Seventeen proteins, ranging in size from 16 to 150 kilodaltons, were implicated by this technique as having some relationship to gliding and were designated Gld-1 through Gld-17. All Gld proteins behaved as integral membrane proteins, partitioning into the detergent phase. All 56 mutants examined exhibited changes in 1 or more of the Gld proteins, with the number of proteins altered in any mutant varying from 1 to 11. Several lines of evidence suggested that proteins Gld-12 through Gld-15 are glycoproteins. Analysis of banding patterns of detergent-fraction proteins of motile revertants supported the idea that the Gld proteins have a role in gliding motility.

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