8W8N

Thermus thermophilus initiation transcription complex in the pre-translocated state

8W8N の概要

• エントリーDOI: 10.2210/pdb8w8n/pdb
• 分子名称: DNA-directed RNA polymerase subunit alpha, ZINC ION, DNA-directed RNA polymerase subunit beta, ... (11 entities in total)
• 機能のキーワード: thermus thermophilus, rna polymerase, pre-translocation, transcription, transcription-dna-rna complex, transcription/dna/rna
• 由来する生物種: Thermus thermophilus HB8; 詳細
• タンパク質・核酸の鎖数: 9
• 化学式量合計: 445067.77

構造登録者

Li, L.,Zhang, Y. (登録日: 2023-09-04, 公開日: 2024-07-24)

主引用文献

Nova, I.C.,Craig, J.M.,Mazumder, A.,Laszlo, A.H.,Derrington, I.M.,Noakes, M.T.,Brinkerhoff, H.,Yang, S.,Vahedian-Movahed, H.,Li, L.,Zhang, Y.,Bowman, J.L.,Huang, J.R.,Mount, J.W.,Ebright, R.H.,Gundlach, J.H.
Nanopore tweezers show fractional-nucleotide translocation in sequence-dependent pausing by RNA polymerase.
Proc.Natl.Acad.Sci.USA, 121:e2321017121-e2321017121, 2024

PubMed Abstract: RNA polymerases (RNAPs) carry out the first step in the central dogma of molecular biology by transcribing DNA into RNA. Despite their importance, much about how RNAPs work remains unclear, in part because the small (3.4 Angstrom) and fast (~40 ms/nt) steps during transcription were difficult to resolve. Here, we used high-resolution nanopore tweezers to observe the motion of single RNAP molecules as it transcribes DNA ~1,000 times improved temporal resolution, resolving single-nucleotide and fractional-nucleotide steps of individual RNAPs at saturating nucleoside triphosphate concentrations. We analyzed RNAP during processive transcription elongation and sequence-dependent pausing at the elemental pause sequence. Each time RNAP encounters the elemental pause sequence, it rapidly interconverts between five translocational states, residing predominantly in a half-translocated state. The kinetics and force-dependence of this half-translocated state indicate it is a functional intermediate between pre- and post-translocated states. Using structural and kinetics data, we show that, in the half-translocated and post-translocated states, sequence-specific protein-DNA interaction occurs between RNAP and a guanine base at the downstream end of the transcription bubble (core recognition element). Kinetic data show that this interaction stabilizes the half-translocated and post-translocated states relative to the pre-translocated state. We develop a kinetic model for RNAP at the pause and discuss this in the context of key structural features.

PubMed: 38990947
DOI: 10.1073/pnas.2321017121

実験手法

X-RAY DIFFRACTION (2.693 Å)