DC Field | Value | Language |
dc.contributor.author | Gumbiowski, K | |
dc.contributor.author | Cherepanov, D | |
dc.contributor.author | Muller, M | |
dc.contributor.author | Panke, O | |
dc.contributor.author | Promto, P | |
dc.contributor.author | Winkler, S | |
dc.contributor.author | Junge, W | |
dc.contributor.author | Engelbrecht, S | |
dc.date.accessioned | 2021-12-23T16:05:07Z | - |
dc.date.available | 2021-12-23T16:05:07Z | - |
dc.date.issued | 2001 | |
dc.identifier.issn | 00219258 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/6791 | - |
dc.description.abstract | In ATP synthase (F0F1-ATPase) ion flow through the membrane-intrinsic portion, Fo, drives the central ``rotor'', subunits c(10)epsilon gamma, relative to the ``stator'' ab(2)delta(alpha beta)(3). This converts ADP and P-i into ATP. Vice versa, ATP hydrolysis drives the rotation backwards. Covalent cross-links between rotor and stator subunits have been shown to inhibit these activities. Aiming at the rotary compliance of subunit gamma we introduced disulfide bridges between gamma (rotor) and a or beta (stator). We engineered cysteine residues into positions located roughly at the ``top,'' ``center,'' and ``bottom'' parts of the coiled-coil portion of gamma and suitable residues on alpha or beta. This part of gamma is located at the center of the (alpha beta)(3) domain with its C-terminal part at the top of F-1 and the bottom part close to the F-0 complex. Disulfide bridge formation under oxidizing conditions was quantitative as shown by SDS-polyacrylamide gel electrophoresis and immunoblotting. As expected both the ATPase activities and the yield of rotating subunits gamma dropped to zero when the cross-link was formed at the center (gamma L262C <----> alpha A334C) and bottom (,gamma Cys(87) <----> beta D380C) positions. But much to our surprise disulfide bridging impaired neither ATP hydrolysis activity nor the full rotation of gamma and the enzyme-generated torque of oxidized F-1, which had been engineered at the top position (gamma A285C <----> alpha P280C). Apparently the high torque of this rotary engine uncoiled the a-helix and forced amino acids at the C-terminal portion of gamma into full rotation around their dihedral (Ramachandran) angles. This conclusion was supported by molecular dynamics simulations: If gamma Cys(285)-Val(286) are attached covalently to (alpha beta )3 and gamma Ala(1)-Ser(281) is forced to rotate, gamma GlY(282)-Ala(284) can serve as cardan shaft. | |
dc.language.iso | en | |
dc.publisher | AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC | |
dc.relation.ispartof | JOURNAL OF BIOLOGICAL CHEMISTRY | |
dc.subject | Biochemistry & Molecular Biology | |
dc.subject | C-SUBUNIT OLIGOMER | |
dc.subject | COUPLING FACTOR-I | |
dc.subject | EPSILON-SUBUNIT | |
dc.subject | ESCHERICHIA-COLI | |
dc.subject | F-1-ATPASE | |
dc.subject | F1-ATPASE | |
dc.subject | GAMMA-SUBUNIT | |
dc.subject | MOLECULAR-DYNAMICS | |
dc.subject | SITE-DIRECTED MUTAGENESIS | |
dc.subject | SYNTHASE | |
dc.title | F-ATPase: Forced full rotation of the rotor despite covalent cross-link with the stator | |
dc.type | journal article | |
dc.identifier.doi | 10.1074/jbc.M106884200 | |
dc.identifier.isi | ISI:000172450400099 | |
dc.description.volume | 276 | |
dc.description.issue | 45 | |
dc.description.startpage | 42287 | |
dc.description.endpage | 42292 | |
dc.contributor.orcid | 0000-0001-6286-4638 | |
dc.contributor.researcherid | R-8391-2016 | |
dc.publisher.place | 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA | |
dcterms.isPartOf.abbreviation | J. Biol. Chem. | |
dcterms.oaStatus | hybrid | |
crisitem.author.dept | FB 05 - Biologie/Chemie | - |
crisitem.author.deptid | fb05 | - |
crisitem.author.parentorg | Universität Osnabrück | - |
crisitem.author.netid | JuWo587 | - |