2O8K image
Deposition Date 2006-12-12
Release Date 2007-07-17
Last Version Date 2023-12-27
Entry Detail
PDB ID:
2O8K
Keywords:
TRANSCRIPTION/DNA
Title:
NMR Structure of the Sigma-54 RpoN Domain Bound to the-24 Promoter Element
Biological Source:
Source Organism:
Aquifex aeolicus (Taxon ID: 63363)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
SOLUTION NMR
Conformers Calculated:
50
Conformers Submitted:
20
Selection Criteria:
20 structures with lowest energy and no restraint violations greater than 0.5 A and 5 degrees for distance and dihedral restraints, respectively
2O8K validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:RNA polymerase sigma factor RpoN
Gene (Uniprot):rpoN
Chain IDs:C (auth: A)
Chain Length:63
Number of Molecules:1
Biological Source:Aquifex aeolicus
UniProt ID:O66858 Pfam ID:PF04552
Ligand Molecules
NA
Primary Citation
Structural basis of DNA recognition by the alternative sigma-factor, sigma54.
J.Mol.Biol. 369 1070 1078 (2007)
PMID: 17481658 DOI: 10.1016/j.jmb.2007.04.019

Abstact

The sigma subunit of bacterial RNA polymerase (RNAP) regulates gene expression by directing RNAP to specific promoters. Unlike sigma(70)-type proteins, the alternative sigma factor, sigma(54), requires interaction with an ATPase to open DNA. We present the solution structure of the C-terminal domain of sigma(54) bound to the -24 promoter element, in which the conserved RpoN box motif inserts into the major groove of the DNA. This structure elucidates the basis for sequence specific recognition of the -24 element, orients sigma(54) on the promoter, and suggests how the C-terminal domain of sigma(54) interacts with RNAP.

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2O8K