4F04 image
Deposition Date 2012-05-03
Release Date 2012-07-11
Last Version Date 2024-02-28
Entry Detail
PDB ID:
4F04
Keywords:
TRANSFERASE
Title:
A Second Allosteric site in E. coli Aspartate Transcarbamoylase: R-state ATCase with UTP bound
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 83333)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.30 Å
R-Value Free:
0.20
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 3 2 1
4F04 validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Aspartate carbamoyltransferase catalytic chain
Gene (Uniprot):pyrB
Chain IDs:A, C
Chain Length:310
Number of Molecules:2
Biological Source:Escherichia coli
UniProt ID:P0A786 Pfam ID:PF02729, PF00185 EC:2.1.3.2
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Aspartate carbamoyltransferase regulatory chain
Gene (Uniprot):pyrI
Chain IDs:B, D
Chain Length:153
Number of Molecules:2
Biological Source:Escherichia coli
UniProt ID:P0A7F3 Pfam ID:PF01948, PF02748
Ligand Molecules
PAL
UTP
ZN
Primary Citation
A second allosteric site in Escherichia coli aspartate transcarbamoylase.
Biochemistry 51 4776 4778 (2012)
PMID: 22667327 DOI: 10.1021/bi3006219

Abstact

Escherichia coli aspartate transcarbamoylase is feedback inhibited by CTP and UTP in the presence of CTP. Here, we show by X-ray crystallography that UTP binds to a unique site on each regulatory chain of the enzyme that is near but not overlapping with the known CTP site. These results bring into question all of the previously proposed mechanisms of allosteric regulation in aspartate transcarbamoylase.

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Primary Citation of related structures
4F04