The catalytic core of an archaeal 2-oxoacid dehydrogenase multienzyme complex is a 42-mer protein assembly
Marrott, N. L., Marshall, J. J. T., Svergun, D. I., Crennell, S. J., Hough, D. W., Danson, M. J. and van den Elsen, J. M. H., 2012. The catalytic core of an archaeal 2-oxoacid dehydrogenase multienzyme complex is a 42-mer protein assembly. FEBS Journal, 279 (5), pp. 713-723.
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The dihydrolipoyl acyl-transferase (E2) enzyme forms the structural and catalytic core of the tripartite 2-oxoacid dehydrogenase multienzyme complexes of the central metabolic pathways. Although this family of multienzyme complexes shares a common architecture, their E2 cores form homo-trimers that, depending on the source, further associate into either octahedral (24-mer) or icosahedral (60-mer) assemblies, as predicted by the principles of quasi-equivalence. In the crystal structure of the E2 core from Thermoplasmaacidophilum, a thermophilic archaeon, the homo-trimers assemble into a unique 42-mer oblate spheroid. Analytical equilibrium centrifugation and small-angle X-ray scattering analyses confirm that this catalytically active 1.08MDa assembly exists as a single species in solution, forming a hollow spheroid with a maximum diameter of 220Å. In this paper we show that a monodisperse macromolecular assembly, built from identical subunits in non-identical environments, forms an irregular protein shell via non-equivalent interactions. This unusually irregular protein shell, combining cubic and dodecahedral geometrical elements, expands on the concept of quasi-equivalence as a basis for understanding macromolecular assemblies by showing that cubic point group symmetry is not a physical requirement in multienzyme assembly. These results extend our basic knowledge of protein assembly and greatly expand the number of possibilities to manipulate self-assembling biological complexes to be utilized in innovative nanotechnology applications.
|Creators||Marrott, N. L., Marshall, J. J. T., Svergun, D. I., Crennell, S. J., Hough, D. W., Danson, M. J. and van den Elsen, J. M. H.|
|Uncontrolled Keywords||x-ray crystallography, multienzyme complex, archaea, thermophile, macromolecular assembly|
|Departments||Faculty of Science > Biology & Biochemistry|
|Research Centres||Centre for Extremophile Research (CER)|
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