PDBe 1ku2

X-ray diffraction
2.9Å resolution

Crystal Structure of Thermus aquaticus RNA Polymerase Sigma Subunit Fragment Containing Regions 1.2 to 3.1


Function and Biology Details

Structure analysis Details

Assembly composition:
homo dimer (preferred)
Entry contents:
1 distinct polypeptide molecule
RNA polymerase sigma factor SigA Chains: A, B
Molecule details ›
Chains: A, B
Length: 241 amino acids
Theoretical weight: 27.61 KDa
Source organism: Thermus aquaticus
Expression system: Escherichia coli BL21(DE3)
  • Canonical: Q9EZJ8 (Residues: 92-332; Coverage: 55%)
Gene name: sigA
Sequence domains:
Structure domains:

Ligands and Environments

1 bound ligand:

No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: NSLS BEAMLINE X25
Spacegroup: P65
Unit cell:
a: 104.186Å b: 104.186Å c: 169.181Å
α: 90° β: 90° γ: 120°
R R work R free
0.23 0.23 0.271
Expression system: Escherichia coli BL21(DE3)