3RQC

Crystal structure of the catalytic core of the 2-oxoacid dehydrogenase multienzyme complex from Thermoplasma acidophilum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.01 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.257 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The catalytic core of an archaeal 2-oxoacid dehydrogenase multienzyme complex is a 42-mer protein assembly.

Marrott, N.L.Marshall, J.J.Svergun, D.I.Crennell, S.J.Hough, D.W.Danson, M.J.van den Elsen, J.M.

(2012) FEBS J 279: 713-723

  • DOI: 10.1111/j.1742-4658.2011.08461.x
  • Primary Citation of Related Structures:  
    3RQC

  • PubMed Abstract: 
  • 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 ar ...

    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 Thermoplasma acidophilum, 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 1.08 MDa assembly exists as a single species in solution, forming a hollow spheroid with a maximum diameter of 220 Å. 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.


    Organizational Affiliation

    Department of Biology and Biochemistry, Centre for Extremophile Research, University of Bath, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Probable lipoamide acyltransferaseA, B, C, D, E, F, G224Thermoplasma acidophilum DSM 1728Mutation(s): 0 
Gene Names: Ta1436
EC: 1.2.4.4
Find proteins for Q9HIA5 (Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165))
Explore Q9HIA5 
Go to UniProtKB:  Q9HIA5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.01 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.257 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 204.84α = 90
b = 204.84β = 90
c = 441.94γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
BALBESphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-01-11
    Type: Initial release
  • Version 1.1: 2012-04-25
    Changes: Database references