Henn-Sax, Martina and Höcker, Birte and Wilmanns, Matthias and Sterner, Reinhard (2001) Divergent evolution of (betaalpha)8-barrel enzymes. Biological chemistry 382 (9), pp. 1315-20.
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The (betaalpha)8-barrel is the most versatile and most frequently encountered fold among enzymes. It is an interesting question how the contemporary (betaalpha)8-barrels are evolutionarily related and by which mechanisms they evolved from more simple precursors. Comprehensive comparisons of amino acid sequences and three-dimensional structures suggest that a large fraction of the known (betaalpha)8-barrels have divergently evolved from a common ancestor. The mutational interconversion of enzymatic activities of several (betaalpha)8-barrels further supports their common evolutionary origin. Moreover, the high structural similarity between the N- and C-terminal (betaalpha)4 units of two (betaalpha)8-barrel enzymes from histidine biosynthesis indicates that the contemporary proteins evolved by tandem duplication and fusion of the gene of an ancestral 'half-barrel' precursor. In support of this hypothesis, recombinantly produced 'half-barrels' were shown to be folded, dimeric proteins.
|Institutions:||Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Prof. Dr. Reinhard Sterner|
|Subjects:||500 Science > 570 Life sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||22 Mar 2010 08:41|
|Last Modified:||22 Mar 2010 08:41|