2R93

Elongation complex of RNA polymerase II with a hepatitis delta virus-derived RNA stem loop

2R93 の概要

• エントリーDOI: 10.2210/pdb2r93/pdb
• 関連するPDBエントリー: 2R92
• 分子名称: RNA (5'-R(*UP*GP*AP*UP*UP*CP*UP*CP*UP*AP*UP*CP*GP*GP*AP*AP*UP*C)-3'), DNA-directed RNA polymerase II subunit RPB9, DNA-directed RNA polymerases I, II, and III subunit RPABC5, ... (15 entities in total)
• 機能のキーワード: transferase/dna/rna, dna-binding, phosphorylation, rna polymerase ii, metal-binding, nuclear protein, transcription bubble, elongation complex, transferase, transcription, rna-dependent, rna-dependent rna synthesis, rdrp, ddrp, rna-binding, hepatitis delta virus, hdv, dna-directed rna polymerase, magnesium, nucleotidyltransferase, nucleus, ubl conjugation, zinc, zinc-finger, polymorphism, cytoplasm, dna damage, dna repair, mrna processing, transferase-rna complex, transferase/rna
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast); 詳細
• 細胞内の位置: Nucleus, nucleolus : P27999 P22139 P40422; Nucleus: P38902 P04050 P08518 P16370 P20433 P20434 P34087 P20436; Cytoplasm : P20435
• タンパク質・核酸の鎖数: 13
• 化学式量合計: 520377.17

構造登録者

Lehmann, E.,Brueckner, F.,Cramer, P. (登録日: 2007-09-12, 公開日: 2007-11-27, 最終更新日: 2024-02-21)

主引用文献

Lehmann, E.,Brueckner, F.,Cramer, P.
Molecular basis of RNA-dependent RNA polymerase II activity.
Nature, 450:445-449, 2007

PubMed Abstract: RNA polymerase (Pol) II catalyses DNA-dependent RNA synthesis during gene transcription. There is, however, evidence that Pol II also possesses RNA-dependent RNA polymerase (RdRP) activity. Pol II can use a homopolymeric RNA template, can extend RNA by several nucleotides in the absence of DNA, and has been implicated in the replication of the RNA genomes of hepatitis delta virus (HDV) and plant viroids. Here we show the intrinsic RdRP activity of Pol II with only pure polymerase, an RNA template-product scaffold and nucleoside triphosphates (NTPs). Crystallography reveals the template-product duplex in the site occupied by the DNA-RNA hybrid during transcription. RdRP activity resides at the active site used during transcription, but it is slower and less processive than DNA-dependent activity. RdRP activity is also obtained with part of the HDV antigenome. The complex of transcription factor IIS (TFIIS) with Pol II can cleave one HDV strand, create a reactive stem-loop in the hybrid site, and extend the new RNA 3' end. Short RNA stem-loops with a 5' extension suffice for activity, but their growth to a critical length apparently impairs processivity. The RdRP activity of Pol II provides a missing link in molecular evolution, because it suggests that Pol II evolved from an ancient replicase that duplicated RNA genomes.

PubMed: 18004386
DOI: 10.1038/nature06290

実験手法

X-RAY DIFFRACTION (4 Å)