1EKP

CRYSTAL STRUCTURE OF HUMAN BRANCHED CHAIN AMINO ACID AMINOTRANSFERASE (MITOCHONDRIAL) COMPLEXED WITH PYRIDOXAL-5'-PHOSPHATE AT 2.5 ANGSTROMS (MONOCLINIC FORM).


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.166 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

The structure of human mitochondrial branched-chain aminotransferase.

Yennawar, N.Dunbar, J.Conway, M.Hutson, S.Farber, G.

(2001) Acta Crystallogr D Biol Crystallogr 57: 506-515

  • DOI: https://doi.org/10.1107/s0907444901001925
  • Primary Citation of Related Structures:  
    1EKF, 1EKP, 1EKV

  • PubMed Abstract: 

    X-ray crystal structures of three forms of human mitochondrial branched-chain aminotransferase (BCAT) were solved by molecular-replacement methods, using Escherichia coli BCAT as the search model. The enzyme is a homodimer and the polypeptide chain of each monomer has two domains. The small domain is composed of residues 1--175 and the large domain is composed of residues 176--365. The active site is close to the dimer interface. The 4'-aldehyde of the PLP cofactor is covalently linked to the epsilon-amino group of the active-site lysine, Lys202, via a Schiff-base linkage in two of the structures. In the third structure, the enzyme is irreversibly inactivated by Tris. The overall fold of the dimer in human mitochondrial BCAT is similar to the structure of two bacterial enzymes, E. coli BCAT and D-amino acid aminotransferase (D-AAT). The residues lining the putative substrate-binding pocket of human BCAT and D-AAT are completely rearranged to allow catalysis with substrates of opposite stereochemistry. In the case of human mitochondrial branched-chain aminotransferase, a hydrogen-bond interaction between the guanidinium group of Arg143 in the first monomer with the side-chain hydroxyl of Tyr70 in the second monomer is important in the formation of the substrate-binding pocket.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Penn State University, University Park, PA 16802, USA. nhy1@psu.edu


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BRANCHED CHAIN AMINO ACID AMINOTRANSFERASE (MITOCHONDRIAL)
A, B
365Homo sapiensMutation(s): 0 
EC: 2.6.1.42
UniProt & NIH Common Fund Data Resources
Find proteins for O15382 (Homo sapiens)
Explore O15382 
Go to UniProtKB:  O15382
PHAROS:  O15382
GTEx:  ENSG00000105552 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15382
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.166 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.63α = 90
b = 111.64β = 95.89
c = 59.9γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description