Comprehensive analysis of transport proteins encoded within the genome of Bdellovibrio bacteriovorus.
Bdellovibrio bacteriovorus is a bacterial parasite with an unusual lifestyle. It grows and reproduces in the periplasm of a host prey bacterium. The complete genome sequence of B. bacteriovorus has recently been reported. We have reanalyzed the transport proteins encoded within the B. bacteriovorus genome according to the current content of the Transporter Classification Database. A comprehensive analysis is given on the types and numbers of transport systems that B. bacteriovorus has. In this regard, the potential protein secretory capabilities of at least four types of inner-membrane secretion systems and five types of outer-membrane secretion systems are described. Surprisingly, B. bacteriovorus has a disproportionate percentage of cytoplasmic membrane channels and outer-membrane porins. It has far more TonB/ExbBD-type systems and MotAB-type systems for energizing outer-membrane transport and motility than does Escherichia coli. Analysis of probable substrate specificities of its transporters provides clues to its metabolic preferences. Interesting examples of gene fusions and of potentially overlapping genes are also noted. Our analyses provide a comprehensive, detailed appreciation of the transport capabilities of B. bacteriovorus. They should serve as a guide for functional experimental analyses.
Barabote
Ravi D
RD
Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093-0116, USA.
Rendulic
Snjezana
S
Schuster
Stephan C
SC
Saier
Milton H
MH
D001501:Bdellovibrio / Q000235:genetics*; D002352:Carrier Proteins / Q000145:classification / Q000235:genetics*; D002874:Chromosome Mapping; D016000:Cluster Analysis; D016680:Genome, Bacterial; D013379:Substrate Specificity; D014018:Tissue Distribution
D002352:Carrier Proteins
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