1L9U image
Deposition Date 2002-03-26
Release Date 2002-05-22
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1L9U
Keywords:
Title:
THERMUS AQUATICUS RNA POLYMERASE HOLOENZYME AT 4 A RESOLUTION
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
4.00 Å
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:RNA POLYMERASE, ALPHA SUBUNIT
Gene (Uniprot):rpoA
Chain IDs:A, B, G (auth: J), H (auth: K)
Chain Length:314
Number of Molecules:4
Biological Source:Thermus aquaticus
Polymer Type:polypeptide(L)
Molecule:RNA POLYMERASE, BETA SUBUNIT
Gene (Uniprot):rpoB
Chain IDs:C, I (auth: L)
Chain Length:1118
Number of Molecules:2
Biological Source:Thermus aquaticus
Polymer Type:polypeptide(L)
Molecule:RNA POLYMERASE, BETA-PRIME SUBUNIT
Gene (Uniprot):rpoC
Chain IDs:D, J (auth: M)
Chain Length:1524
Number of Molecules:2
Biological Source:Thermus aquaticus
Polymer Type:polypeptide(L)
Molecule:RNA POLYMERASE, OMEGA SUBUNIT
Gene (Uniprot):rpoZ
Chain IDs:E, K (auth: N)
Chain Length:99
Number of Molecules:2
Biological Source:Thermus aquaticus
Polymer Type:polypeptide(L)
Molecule:SIGMA FACTOR SIGA
Gene (Uniprot):sigA
Chain IDs:F (auth: H), L (auth: Q)
Chain Length:332
Number of Molecules:2
Biological Source:Thermus aquaticus
Primary Citation
Structural basis of transcription initiation: RNA polymerase holoenzyme at 4 A resolution.
Science 296 1280 1284 (2002)
PMID: 12016306 DOI: 10.1126/science.1069594

Abstact

The crystal structure of the initiating form of Thermus aquaticus RNA polymerase, containing core RNA polymerase (alpha2betabeta'omega) and the promoter specificity sigma subunit, has been determined at 4 angstrom resolution. Important structural features of the RNA polymerase and their roles in positioning sigma within the initiation complex are delineated, as well as the role played by sigma in modulating the opening of the RNA polymerase active-site channel. The two carboxyl-terminal domains of sigma are separated by 45 angstroms on the surface of the RNA polymerase, but are linked by an extended loop. The loop winds near the RNA polymerase active site, where it may play a role in initiating nucleotide substrate binding, and out through the RNA exit channel. The advancing RNA transcript must displace the loop, leading to abortive initiation and ultimately to sigma release.

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Primary Citation of related structures