Summary information and primary citation

PDB-id
2e2h; SNAP-derived features in text and JSON formats; DNAproDB
Class
transcription,transferase-DNA-RNA hybrid
Method
X-ray (3.95 Å)
Summary
RNA polymerase ii elongation complex at 5 mm mg2+ with gtp
Reference
Wang D, Bushnell DA, Westover KD, Kaplan CD, Kornberg RD (2006): "Structural basis of transcription: role of the trigger loop in substrate specificity and catalysis." Cell(Cambridge,Mass.), 127, 941-954. doi: 10.1016/j.cell.2006.11.023.
Abstract
New structures of RNA polymerase II (pol II) transcribing complexes reveal a likely key to transcription. The trigger loop swings beneath a correct nucleoside triphosphate (NTP) in the nucleotide addition site, closing off the active center and forming an extensive network of interactions with the NTP base, sugar, phosphates, and additional pol II residues. A histidine side chain in the trigger loop, precisely positioned by these interactions, may literally "trigger" phosphodiester bond formation. Recognition and catalysis are thus coupled, ensuring the fidelity of transcription.

Cartoon-block schematics in six views (download the tarball)

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