Structure of an RNA polymerase II-TFIIB complex and the transcription initiation mechanism

Xin Liu, David A. Bushnell, Dong Wang, Guillermo Calero, Roger D. Kornbergt

Research output: Contribution to journalArticlepeer-review

164 Scopus citations


Previous x-ray crystal structures have given insight into the mechanism of transcription and the role of general transcription factors in the initiation of the process. A structure of an RNA polymerase II-general transcription factor TFIIB complex at 4.5 angstrom resolution revealed the amino-terminal region of TFIIB, including a loop termed the "B finger," reaching into the active center of the polymerase where it may interact with both DNA and RNA, but this structure showed little of the carboxyl-terminal region. A new crystal structure of the same complex at 3.8 angstrom resolution obtained under different solution conditions is complementary with the previous one, revealing the carboxyl-terminal region of TFIIB, located above the polymerase active center cleft, but showing none of the B finger. In the new structure, the linker between the amino- and carboxyl-terminal regions can also be seen, snaking down from above the cleft toward the active center. The two structures, taken together with others previously obtained, dispel long-standing mysteries of the transcription initiation process.

Original languageEnglish (US)
Pages (from-to)206-209
Number of pages4
Issue number5962
StatePublished - 2010

ASJC Scopus subject areas

  • General


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