ATP binding controls distinct structural transitions of Escherichia coli DNA gyrase in complex with DNA.
ATP binding controls distinct structural transitions of Escherichia coli DNA gyrase in complex with DNA.
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DOI:
10.1038/nsmb.2278
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发表时间:
2012-04-08
影响因子:
16.8
通讯作者:
Bryant Z
中科院分区:
文献类型:
--
作者:
Basu A;Schoeffler AJ;Berger JM;Bryant Z
DNA gyrase is a molecular motor that harnesses the free energy of ATP hydrolysis to introduce negative supercoils into DNA. A critical step in this reaction is the formation of a chiral DNA wrap on a similar scale to the nucleosome. Here we observe gyrase structural dynamics using a single-molecule assay in which gyrase drives the processive, stepwise rotation of a nanosphere attached to the side of a stretched DNA molecule. Analysis of rotational pauses and measurements of DNA contraction reveal multiple ATP-modulated structural transitions. DNA wrapping is coordinated with the ATPase cycle and proceeds via an unanticipated structural intermediate that dominates the kinetics of supercoiling. Our findings reveal a conformational landscape of loosely coupled transitions funneling the motor toward productive energy transduction, a feature that may be common to the reaction cycles of other DNA and protein remodeling machines.
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影响因子:
14.9
作者:
Lanz MA;Klostermeier D
通讯作者:
Klostermeier D
DOI:
10.1073/pnas.93.25.14416
发表时间:
1996-12-10
影响因子:
11.1
作者:
Kampranis, SC;Maxwell, A
通讯作者:
Maxwell, A
影响因子:
2.9
作者:
Bates, AD;ODea, MH;Gellert, M
通讯作者:
Gellert, M
影响因子:
64.5
作者:
KIRKEGAARD, K;WANG, JC
通讯作者:
WANG, JC
影响因子:
2.9
作者:
ALI, JA;JACKSON, AP;MAXWELL, A
通讯作者:
MAXWELL, A