A structural census of genomes: comparing bacterial, eukaryotic, and archaeal genomes in terms of protein structure

Journal of Molecular Biology
M Gerstein

Abstract

Representative genomes from each of the three kingdoms of life are compared in terms of protein structure, in particular, those of Haemophilus influenzae (a bacteria), Methanococcus jannaschii (an archaeon), and yeast (a eukaryote). The comparison is in the form of a census (or comprehensive accounting) of the relative occurrence of secondary and tertiary structures in the genomes, which particular emphasis on patterns of supersecondary structure. Comparison of secondary structure shows that the three genomes have nearly the same overall secondary-structure content, although they differ markedly in amino acid composition. Comparison of super-secondary structure, using a novel "frequent-words" approach, shows that yeast has a preponderance of consecutive strands (e.g. beta-beta-beta patterns), Haemophilus, consecutive helices (alpha-alpha-alpha), and Methanococcus, alternating helix-strand structures (beta-alpha-beta). Yeast also has significantly more helical membrane proteins than the other two genomes, with most of the differences concentrated in proteins containing two transmembrane segments. Comparison of tertiary structure (by sequence matching and domain-level clustering) highlights the substantial duplication in each gen...Continue Reading

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