1b5s

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Template:STRUCTURE 1b5s

DIHYDROLIPOYL TRANSACETYLASE (E.C.2.3.1.12) CATALYTIC DOMAIN (RESIDUES 184-425) FROM BACILLUS STEAROTHERMOPHILUS

Overview

The pyruvate dehydrogenase multienzyme complex (Mr of 5-10 million) is assembled around a structural core formed of multiple copies of dihydrolipoyl acetyltransferase (E2p), which exhibits the shape of either a cube or a dodecahedron, depending on the source. The crystal structures of the 60-meric dihydrolipoyl acyltransferase cores of Bacillus stearothermophilus and Enterococcus faecalis pyruvate dehydrogenase complexes were determined and revealed a remarkably hollow dodecahedron with an outer diameter of approximately 237 A, 12 large openings of approximately 52 A diameter across the fivefold axes, and an inner cavity with a diameter of approximately 118 A. Comparison of cubic and dodecahedral E2p assemblies shows that combining the principles of quasi-equivalence formulated by Caspar and Klug [Caspar, D. L. & Klug, A. (1962) Cold Spring Harbor Symp. Quant. Biol. 27, 1-4] with strict Euclidean geometric considerations results in predictions of the major features of the E2p dodecahedron matching the observed features almost exactly.

About this Structure

1B5S is a Single protein structure of sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA.

Reference

Principles of quasi-equivalence and Euclidean geometry govern the assembly of cubic and dodecahedral cores of pyruvate dehydrogenase complexes., Izard T, Aevarsson A, Allen MD, Westphal AH, Perham RN, de Kok A, Hol WG, Proc Natl Acad Sci U S A. 1999 Feb 16;96(4):1240-5. PMID:9990008 Page seeded by OCA on Fri May 2 11:06:19 2008