Microbial genome analyses: global comparisons of transport capabilities based on phylogenies, bioenergetics and substrate specificities

Journal of Molecular Biology
I T PaulsenM H Saier

Abstract

We have conducted genome sequence analyses of seven prokaryotic microorganisms for which completely sequenced genomes are available (Escherichia coli, Haemophilus influenzae, Helicobacter pylori, Bacillus subtilis, Mycoplasma genitalium, Synechocystis PCC6803 and Methanococcus jannaschii). We report the distribution of encoded known and putative polytopic cytoplasmic membrane transport proteins within these genomes. Transport systems for each organism were classified according to (1) putative membrane topology, (2) protein family, (3) bioenergetics, and (4) substrate specificities. The overall transport capabilities of each organism were thereby estimated. Probable function was assigned to greater than 90% of the putative transport proteins identified. The results show the following: (1) Numbers of transport systems in eubacteria are approximately proportional to genome size and correspond to 9.7 to 10.8% of the total encoded genes except for H. pylori (5.4%), Synechocystis (4.7%) and M. jannaschii (3.5%) which exhibit substantially lower proportions. (2) The distribution of topological types is similar in all seven organisms. (3) Transport systems belonging to 67 families were identified within the genomes of these organisms, ...Continue Reading

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