2HMF image
Deposition Date 2006-07-11
Release Date 2006-10-17
Last Version Date 2023-08-30
Entry Detail
PDB ID:
2HMF
Keywords:
Title:
Structure of a Threonine Sensitive Aspartokinase from Methanococcus jannaschii Complexed with Mg-ADP and Aspartate
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.70 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Probable aspartokinase
Gene (Uniprot):MJ0571
Chain IDs:A, B, C, D
Chain Length:469
Number of Molecules:4
Biological Source:Methanocaldococcus jannaschii
Primary Citation
The initial step in the archaeal aspartate biosynthetic pathway catalyzed by a monofunctional aspartokinase.
Acta Crystallogr.,Sect.F 62 962 966 (2006)
PMID: 17012784 DOI: 10.1107/S1744309106038279

Abstact

The activation of the beta-carboxyl group of aspartate catalyzed by aspartokinase is the commitment step to amino-acid biosynthesis in the aspartate pathway. The first structure of a microbial aspartokinase, that from Methanococcus jannaschii, has been determined in the presence of the amino-acid substrate L-aspartic acid and the nucleotide product MgADP. The enzyme assembles into a dimer of dimers, with the interfaces mediated by both the N- and C-terminal domains. The active-site functional groups responsible for substrate binding and specificity have been identified and roles have been proposed for putative catalytic functional groups.

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