2W5J image
Entry Detail
PDB ID:
2W5J
Keywords:
Title:
Structure of the c14-rotor ring of the proton translocating chloroplast ATP synthase
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2008-12-10
Release Date:
2009-05-19
Method Details:
Experimental Method:
Resolution:
3.80 Å
R-Value Free:
0.33
R-Value Work:
0.31
R-Value Observed:
0.31
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ATP SYNTHASE C CHAIN, CHLOROPLASTIC
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L, M, N (auth: V)
Chain Length:78
Number of Molecules:14
Biological Source:SPINACIA OLERACEA
Ligand Molecules
Primary Citation
Structure of the c14 rotor ring of the proton translocating chloroplast ATP synthase.
J. Biol. Chem. 284 18228 18235 (2009)
PMID: 19423706 DOI: 10.1074/jbc.M109.006916

Abstact

The structure of the membrane integral rotor ring of the proton translocating F(1)F(0) ATP synthase from spinach chloroplasts was determined to 3.8 A resolution by x-ray crystallography. The rotor ring consists of 14 identical protomers that are symmetrically arranged around a central pore. Comparisons with the c(11) rotor ring of the sodium translocating ATPase from Ilyobacter tartaricus show that the conserved carboxylates involved in proton or sodium transport, respectively, are 10.6-10.8 A apart in both c ring rotors. This finding suggests that both ATPases have the same gear distance despite their different stoichiometries. The putative proton-binding site at the conserved carboxylate Glu(61) in the chloroplast ATP synthase differs from the sodium-binding site in Ilyobacter. Residues adjacent to the conserved carboxylate show increased hydrophobicity and reduced hydrogen bonding. The crystal structure reflects the protonated form of the chloroplast c ring rotor. We propose that upon deprotonation, the conformation of Glu(61) is changed to another rotamer and becomes fully exposed to the periphery of the ring. Reprotonation of Glu(61) by a conserved arginine in the adjacent a subunit returns the carboxylate to its initial conformation.

Legend

Protein

Chemical

Disease

Primary Citation of related structures