Intersubunit coordination in a homomeric ring ATPase.
Intersubunit coordination in a homomeric ring ATPase.
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DOI:
10.1038/nature07637
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发表时间:
2009-01-22
期刊:
影响因子:
64.8
通讯作者:
Bustamante, Carlos
中科院分区:
文献类型:
--
作者:
Moffitt, Jeffrey R.;Chemla, Yann R.;Aathavan, K.;Grimes, Shelley;Jardine, Paul J.;Anderson, Dwight L.;Bustamante, Carlos
Homomeric ring-ATPases perform many vital and varied tasks in the cell, ranging from chromosome segregation to protein degradation. Here we report the first direct observation of the inter-subunit coordination and the step size of such a ring-ATPase, the dsDNA packaging motor in the bacteriophage φ29. Using high-resolution optical tweezers, we find that packaging occurs in increments of 10 bp. Statistical analysis of the preceding dwell times reveals that multiple ATPs bind during each dwell, and application of high force reveals that these 10-bp increments are composed of four 2.5-bp steps. These results indicate that the hydrolysis cycles of the individual subunits are highly coordinated via a mechanism novel for ring-ATPases. In addition, a step size that is a non-integer number of base pairs demands new models for motor-DNA interactions.
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影响因子:
9.8
作者:
Hugel, Thorsten;Michaelis, Jens;Bustamante, Carlos
通讯作者:
Bustamante, Carlos
影响因子:
3.3
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Chemla, Yann R.;Moffitt, Jeffrey R.;Bustamante, Carlos
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