Structural and functional features of the Escherichia coli F-1-ATPase

Autor(en): Gruber, G
Stichwörter: ab initio shape determination; ADENOSINE-TRIPHOSPHATASE; Biophysics; CATALYTIC SITES; Cell Biology; DELTA-SUBUNIT; DISULFIDE BOND FORMATION; disulfide formation; EPSILON-SUBUNIT; Escherichia coli; F-1 ATPASE; F-1-ATPase; F1F0 ATP SYNTHASE; GAMMA-SUBUNIT; QUATERNARY STRUCTURE; small-angle X-ray scattering; SOLUTION SCATTERING
Erscheinungsdatum: 2000
Herausgeber: KLUWER ACADEMIC/PLENUM PUBL
Journal: JOURNAL OF BIOENERGETICS AND BIOMEMBRANES
Volumen: 32
Ausgabe: 4
Startseite: 341
Seitenende: 346
Zusammenfassung: 
The structural organization and overall dimensions of the Escherichia coli F-1-ATPase in solution has been analyzed by synchroton X-ray scattering. Using an independent ab initio approach, the low-resolution shape of the hydrated enzyme was determined at 3.2 nm resolution. The shape permitted unequivocal identification of the volume occupied by the alpha (3)beta (3)gamma complex of the atomic model of the ECF1-ATPase. The position of the delta and epsilon subunits were found by interactive fitting of the solution scattering data and by cross-linking studies. Laser-induced covalent incorporation of 2-azido-ATP established a direct relationship between nucleotide binding affinity and the different interactions between the stalk subunits gamma and epsilon with the three catalytic subunits (beta) of the F-1-ATPase. Mutants of the ECF1-ATPase with the introduction of Trp-for-Tyr replacement in the catalytic site of the complex made it possible to monitor the activated state for ATP synthesis (ATP conformation) in which the gamma and epsilon subunits are in close proximity to the alpha subunits and the ADP conformation, with the stalk subunits are linked to the beta subunit.
ISSN: 0145479X
DOI: 10.1023/A:1005519801891

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