7OB9 image
Deposition Date 2021-04-21
Release Date 2021-12-08
Last Version Date 2024-07-10
Entry Detail
PDB ID:
7OB9
Keywords:
TRANSCRIPTION
Title:
Cryo-EM structure of human RNA Polymerase I in elongation state
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
synthetic construct
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
2.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7OB9 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase I subunit RPA1
Gene (Uniprot):POLR1A
Chain IDs:A
Chain Length:1720
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:O95602 Pfam ID:PF04997, PF00623, PF04983, PF05000, PF04998
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase I subunit RPA2
Gene (Uniprot):POLR1B
Chain IDs:B
Chain Length:1135
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q9H9Y6 Pfam ID:PF04563, PF04561, PF04565, PF06883, PF00562, PF04560
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I and III subunit RPAC1
Gene (Uniprot):POLR1C
Chain IDs:C
Chain Length:346
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:O15160 Pfam ID:PF01193, PF01000
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I, II, and III subunit RPABC1
Gene (Uniprot):POLR2E
Chain IDs:D (auth: E)
Chain Length:210
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P19388 Pfam ID:PF03871, PF01191
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I, II, and III subunit RPABC2
Gene (Uniprot):POLR2F
Chain IDs:E (auth: F)
Chain Length:127
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P61218 Pfam ID:PF01192
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase I subunit RPA43
Gene (Uniprot):POLR1F
Chain IDs:F (auth: G)
Chain Length:338
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q3B726 Pfam ID:PF03876, PF17875
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I, II, and III subunit RPABC3
Gene (Uniprot):POLR2H
Chain IDs:G (auth: H)
Chain Length:150
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P52434 Pfam ID:PF03870
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase I subunit RPA12
Gene (Uniprot):POLR1H
Chain IDs:H (auth: I)
Chain Length:126
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q9P1U0 Pfam ID:PF01096
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I, II, and III subunit RPABC5
Gene (Uniprot):POLR2L
Chain IDs:I (auth: J)
Chain Length:67
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P62875 Pfam ID:PF01194
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I and III subunit RPAC2
Gene (Uniprot):POLR1D
Chain IDs:J (auth: K)
Chain Length:133
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P0DPB6 Pfam ID:PF13656
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerases I, II, and III subunit RPABC4
Gene (Uniprot):POLR2K
Chain IDs:K (auth: L)
Chain Length:58
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P53803 Pfam ID:PF03604
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase I subunit RPA49
Gene (Uniprot):POLR1E
Chain IDs:M
Chain Length:419
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q9GZS1 Pfam ID:PF06870
Protein Blast
Polymer Type:polypeptide(L)
Molecule:DNA-directed RNA polymerase I subunit RPA34
Gene (Uniprot):POLR1G
Chain IDs:L (auth: N)
Chain Length:510
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:O15446 Pfam ID:PF08208
Polymer Type:polyribonucleotide
Molecule:RNA
Chain IDs:N (auth: R)
Chain Length:29
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Molecule:DNA non-template strand
Chain IDs:O (auth: S)
Chain Length:43
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Molecule:DNA template strand
Chain IDs:P (auth: T)
Chain Length:43
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
MG
ZN
Primary Citation
Cryo-EM structures of human RNA polymerase I.
Nat.Struct.Mol.Biol. 28 997 1008 (2021)
PMID: 34887565 DOI: 10.1038/s41594-021-00693-4

Abstact

RNA polymerase I (Pol I) specifically synthesizes ribosomal RNA. Pol I upregulation is linked to cancer, while mutations in the Pol I machinery lead to developmental disorders. Here we report the cryo-EM structure of elongating human Pol I at 2.7 Å resolution. In the exit tunnel, we observe a double-stranded RNA helix that may support Pol I processivity. Our structure confirms that human Pol I consists of 13 subunits with only one subunit forming the Pol I stalk. Additionally, the structure of human Pol I in complex with the initiation factor RRN3 at 3.1 Å resolution reveals stalk flipping upon RRN3 binding. We also observe an inactivated state of human Pol I bound to an open DNA scaffold at 3.3 Å resolution. Lastly, the high-resolution structure of human Pol I allows mapping of disease-related mutations that can aid understanding of disease etiology.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
7OB9