title: Bioinformatic analyses of integral membrane transport proteins encoded within the genome of the planctomycetes species, Rhodopirellula baltica.
abstract: Rhodopirellula baltica (R. baltica) is a Planctomycete, known to have intracellular membranes. Because of its unusual cell structure and ecological significance, we have conducted comprehensive analyses of its transmembrane transport proteins. The complete proteome of R. baltica was screened against the Transporter Classification Database (TCDB) to identify recognizable integral membrane transport proteins. 342 proteins were identified with a high degree of confidence, and these fell into several different classes. R. baltica encodes in its genome channels (12%), secondary carriers (33%), and primary active transport proteins (41%) in addition to classes represented in smaller numbers. Relative to most non-marine bacteria, R. baltica possesses a larger number of sodium-dependent symporters but fewer proton-dependent symporters, and it has dimethylsulfoxide (DMSO) and trimethyl-amine-oxide (TMAO) reductases, consistent with its Na(+)-rich marine environment. R. baltica also possesses a Na(+)-translocating NADH:quinone dehydrogenase (Na(+)-NDH), a Na(+) efflux decarboxylase, two Na(+)-exporting ABC pumps, two Na(+)-translocating F-type ATPases, two Na(+):H(+) antiporters and two K(+):H(+) antiporters. Flagellar motility probably depends on the sodium electrochemical gradient. Surprisingly, R. baltica also has a complete set of H(+)-translocating electron transport complexes similar to those present in α-proteobacteria and eukaryotic mitochondria. The transport proteins identified proved to be typical of the bacterial domain with little or no indication of the presence of eukaryotic-type transporters. However, novel functionally uncharacterized multispanning membrane proteins were identified, some of which are found only in Rhodopirellula species, but others of which are widely distributed in bacteria. The analyses lead to predictions regarding the physiology, ecology and evolution of R. baltica.
authors: Department of Molecular Biology, Division of Biological Sciences, University of California at San Diego, La Jolla, CA, 92093-0116, USA.
authors: Philipp
authors: P
authors: Paparoditis
authors: Ake
authors: A
authors: Västermark
authors: Andrew J
authors: AJ
authors: Le
authors: John A
authors: JA
authors: Fuerst
authors: Milton H
authors: MH
authors: Saier
mesh_terms: D059001:Aquatic Organisms; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D005075:Biological Evolution; D019295:Computational Biology; D030541:Databases, Genetic; D004579:Electron Transport; D016680:Genome, Bacterial; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000235:genetics / Q000378:metabolism*; D010802:Phylogeny; D061328:Planctomycetales / Q000145:classification / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins
keywords: Cellular energization; Electron transport; Marine ecology; Planctomycetes; Sodium motive force; Transport proteins
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