7DTH image
Entry Detail
PDB ID:
7DTH
Keywords:
Title:
Solution structure of RPB6, common subunit of RNA polymerases I, II, and III
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2021-01-05
Release Date:
2022-01-19
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DNA-directed RNA polymerases I, II, and III subunit RPABC2
Chain IDs:A
Chain Length:130
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Three human RNA polymerases interact with TFIIH via a common RPB6 subunit.
Nucleic Acids Res. 50 1 16 (2022)
PMID: 34268577 DOI: 10.1093/nar/gkab612

Abstact

In eukaryotes, three RNA polymerases (RNAPs) play essential roles in the synthesis of various types of RNA: namely, RNAPI for rRNA; RNAPII for mRNA and most snRNAs; and RNAPIII for tRNA and other small RNAs. All three RNAPs possess a short flexible tail derived from their common subunit RPB6. However, the function of this shared N-terminal tail (NTT) is not clear. Here we show that NTT interacts with the PH domain (PH-D) of the p62 subunit of the general transcription/repair factor TFIIH, and present the structures of RPB6 unbound and bound to PH-D by nuclear magnetic resonance (NMR). Using available cryo-EM structures, we modelled the activated elongation complex of RNAPII bound to TFIIH. We also provide evidence that the recruitment of TFIIH to transcription sites through the p62-RPB6 interaction is a common mechanism for transcription-coupled nucleotide excision repair (TC-NER) of RNAPI- and RNAPII-transcribed genes. Moreover, point mutations in the RPB6 NTT cause a significant reduction in transcription of RNAPI-, RNAPII- and RNAPIII-transcribed genes. These and other results show that the p62-RPB6 interaction plays multiple roles in transcription, TC-NER, and cell proliferation, suggesting that TFIIH is engaged in all RNAP systems.

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