Opening and closing of the bacterial RNA polymerase clamp.
Opening and closing of the bacterial RNA polymerase clamp.
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DOI:
10.1126/science.1218716
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发表时间:
2012-08-03
期刊:
影响因子:
--
通讯作者:
Ebright RH
中科院分区:
文献类型:
--
作者:
Chakraborty A;Wang D;Ebright YW;Korlann Y;Kortkhonjia E;Kim T;Chowdhury S;Wigneshweraraj S;Irschik H;Jansen R;Nixon BT;Knight J;Weiss S;Ebright RH
Using single-molecule fluorescence resonance energy transfer, we have defined bacterial RNA polymerase (RNAP) clamp formation at each step in transcription initiation and elongation. We find that the clamp predominantly is open in free RNAP and early intermediates in transcription initiation, but closes upon formation of a catalytically competent transcription initiation complex and remains closed during initial transcription and transcription elongation. We show that four RNAP inhibitors interfere with clamp opening. We propose that clamp opening allows DNA to be loaded into and unwound in the RNAP active-center cleft, that DNA loading and unwinding trigger clamp closure, and that clamp closure accounts for the high stability of initiation complexes and the high stability and processivity of elongation complexes.
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