2E5Y image
Deposition Date 2006-12-25
Release Date 2007-07-10
Last Version Date 2023-10-25
Entry Detail
PDB ID:
2E5Y
Keywords:
Title:
Epsilon subunit and ATP complex of F1F0-ATP synthase from the Thermophilic Bacillus PS3
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.92 Å
R-Value Free:
0.25
R-Value Work:
0.2
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:ATP synthase epsilon chain
Gene (Uniprot):atpC
Chain IDs:A, B
Chain Length:133
Number of Molecules:2
Biological Source:Bacillus sp. PS3
Ligand Molecules
Primary Citation
Structures of the thermophilic F1-ATPase {varepsilon} subunit suggesting ATP-regulated arm motion of its C-terminal domain in F1
Proc.Natl.Acad.Sci.Usa 104 11233 11238 (2007)
PMID: 17581881 DOI: 10.1073/pnas.0701045104

Abstact

The epsilon subunit of bacterial and chloroplast F(o)F(1)-ATP synthases modulates their ATP hydrolysis activity. Here, we report the crystal structure of the ATP-bound epsilon subunit from a thermophilic Bacillus PS3 at 1.9-A resolution. The C-terminal two alpha-helices were folded into a hairpin, sitting on the beta sandwich structure, as reported for Escherichia coli. A previously undescribed ATP binding motif, I(L)DXXRA, recognizes ATP together with three arginine and one glutamate residues. The E. coli epsilon subunit binds ATP in a similar manner, as judged on NMR. We also determined solution structures of the C-terminal domain of the PS3 epsilon subunit and relaxation parameters of the whole molecule by NMR. The two helices fold into a hairpin in the presence of ATP but extend in the absence of ATP. The latter structure has more helical regions and is much more flexible than the former. These results suggest that the epsilon C-terminal domain can undergo an arm-like motion in response to an ATP concentration change and thereby contribute to regulation of F(o)F(1)-ATP synthase.

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