1I5o image
Deposition Date 2001-02-28
Release Date 2001-05-02
Last Version Date 2023-08-09
Entry Detail
PDB ID:
1I5O
Keywords:
Title:
CRYSTAL STRUCTURE OF MUTANT R105A OF E. COLI ASPARTATE TRANSCARBAMOYLASE
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.80 Å
R-Value Free:
0.21
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 3 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:ASPARTATE TRANSCARBAMOYLASE CATALYTIC CHAIN
Gene (Uniprot):pyrB
Mutations:R105A
Chain IDs:A, C
Chain Length:310
Number of Molecules:2
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Molecule:ASPARTATE TRANSCARBAMOYLASE REGULATORY CHAIN
Gene (Uniprot):pyrI
Chain IDs:B, D
Chain Length:153
Number of Molecules:2
Biological Source:Escherichia coli
Primary Citation
Direct structural evidence for a concerted allosteric transition in Escherichia coli aspartate transcarbamoylase.
Nat.Struct.Biol. 8 423 426 (2001)
PMID: 11323717 DOI: 10.1038/87582

Abstact

Regulation of protein function, often achieved by allosteric mechanisms, is central to normal physiology and cellular processes. Although numerous models have been proposed to account for the cooperative binding of ligands to allosteric proteins and enzymes, direct structural support has been lacking. Here, we used a combination of X-ray crystallography and small angle X-ray scattering in solution to provide direct structural evidence that the binding of ligand to just one of the six active sites of Escherichia coli aspartate transcarbamoylase induces a concerted structural transition from the T to the R state.

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Primary Citation of related structures