3K7D image
Deposition Date 2009-10-12
Release Date 2009-12-15
Last Version Date 2023-09-06
Entry Detail
PDB ID:
3K7D
Keywords:
Title:
C-terminal (adenylylation) domain of E.coli Glutamine Synthetase Adenylyltransferase
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Glutamate-ammonia-ligase adenylyltransferase
Gene (Uniprot):glnE
Chain IDs:A, B
Chain Length:498
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Structure of the Adenylylation Domain of E. coli Glutamine Synthetase Adenylyl Transferase: Evidence for Gene Duplication and Evolution of a New Active Site.
J.Mol.Biol. 396 773 784 (2010)
PMID: 20026075 DOI: 10.1016/j.jmb.2009.12.011

Abstact

The X-ray structure of the C-terminal fragment, containing residues 449-946, of Escherichia coli glutamine synthetase adenylyl transferase (ATase) has been determined. ATase is part of the cascade that regulates the enzymatic activity of E. coli glutamine synthetase, a key component of the cell's machinery for the uptake of ammonia. It has two enzymatic activities, adenylyl removase (AR) and adenylyl transferase (AT), which are located in distinct catalytic domains that are separated by a regulatory (R) domain. We previously reported the three-dimensional structure of the AR domain (residues 1-440). The present structure contains both the R and AT domains. AR and AT share 24% sequence identity and also contain the beta-polymerase motif that is characteristic of many nucleotidylyl transferase enzymes. The structures overlap with an rmsd of 2.4 A when the superhelical R domain is omitted. A model for the complete ATase molecule is proposed, along with some refinements of domain boundaries. A rather more speculative model for the complex of ATase with glutamine synthetase and the nitrogen signal transduction protein PII is also presented.

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Primary Citation of related structures