8HSG image
Deposition Date 2022-12-19
Release Date 2023-05-03
Last Version Date 2024-07-03
Entry Detail
PDB ID:
8HSG
Keywords:
Title:
Thermus thermophilus RNA polymerase elongation complex
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
3.20 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase subunit alpha
Gene (Uniprot):rpoA
Chain IDs:A (auth: G), B (auth: H)
Chain Length:315
Number of Molecules:2
Biological Source:Thermus thermophilus HB8
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase subunit beta
Gene (Uniprot):rpoB
Chain IDs:C (auth: I)
Chain Length:1119
Number of Molecules:1
Biological Source:Thermus thermophilus HB8
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase subunit beta'
Gene (Uniprot):rpoC
Mutations:C-terminal FLAG-tagged
Chain IDs:D (auth: J)
Chain Length:1532
Number of Molecules:1
Biological Source:Thermus thermophilus HB8
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase subunit omega
Gene (Uniprot):rpoZ
Chain IDs:E (auth: K)
Chain Length:99
Number of Molecules:1
Biological Source:Thermus thermophilus HB8
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (27-MER)
Chain IDs:H (auth: N)
Chain Length:180
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polyribonucleotide
Molecule:RNA (5'-R(P*CP*CP*AP*CP*AP*UP*CP*CP*AP*CP*CP*U)-3')
Chain IDs:G (auth: R)
Chain Length:125
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (37-MER)
Chain IDs:F (auth: T)
Chain Length:184
Number of Molecules:1
Biological Source:DNA molecule
Primary Citation
Structural basis of the transcription termination factor Rho engagement with transcribing RNA polymerase from Thermus thermophilus.
Sci Adv 9 eade7093 eade7093 (2023)
PMID: 36753546 DOI: 10.1126/sciadv.ade7093

Abstact

Transcription termination is an essential step in transcription by RNA polymerase (RNAP) and crucial for gene regulation. For many bacterial genes, transcription termination is mediated by the adenosine triphosphate-dependent RNA translocase/helicase Rho, which causes RNA/DNA dissociation from the RNAP elongation complex (EC). However, the structural basis of the interplay between Rho and RNAP remains obscure. Here, we report the cryo-electron microscopy structure of the Thermus thermophilus RNAP EC engaged with Rho. The Rho hexamer binds RNAP through the carboxyl-terminal domains, which surround the RNA exit site of RNAP, directing the nascent RNA seamlessly from the RNA exit to its central channel. The β-flap tip at the RNA exit is critical for the Rho-dependent RNA release, and its deletion causes an alternative Rho-RNAP binding mode, which is irrelevant to termination. The Rho binding site overlaps with the binding sites of other macromolecules, such as ribosomes, providing a general basis of gene regulation.

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Primary Citation of related structures