Structural basis of transcription initiation.
Structural basis of transcription initiation.
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DOI:
10.1126/science.1227786
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发表时间:
2012-11-23
期刊:
影响因子:
--
通讯作者:
Ebright RH
中科院分区:
文献类型:
--
作者:
Zhang Y;Feng Y;Chatterjee S;Tuske S;Ho MX;Arnold E;Ebright RH
During transcription initiation, RNA polymerase (RNAP) binds and unwinds promoter DNA to form an RNAP-promoter open complex. We have determined crystal structures at 2.9 and 3.0 Å resolution of functional transcription initiation complexes comprising Thermus thermophilus RNA polymerase, σA, and a promoter DNA fragment corresponding to the transcription bubble and downstream dsDNA of the RNAP-promoter open complex. The structures show that σ recognizes the -10 element and discriminator element through interactions that include the unstacking and insertion into pockets of three DNA bases, and that RNAP recognizes the −4/+2 region through interactions that include the unstacking and insertion into a pocket of the +2 base. The structures further show that interactions between σ and template-strand ssDNA pre-organize template-strand ssDNA to engage the RNAP active center.
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