X-ray diffraction
2.3Å resolution

Crystal structure of the cyanobacterial metallothionein repressor SmtB (C14S/C61S/C121S mutant) in the Zn2alpha5-form


Function and Biology Details

Structure analysis Details

Assembly composition:
homo dimer (preferred)
Entry contents:
1 distinct polypeptide molecule
Transcriptional repressor SmtB Chains: A, B
Molecule details ›
Chains: A, B
Length: 122 amino acids
Theoretical weight: 13.51 KDa
Source organism: Synechococcus elongatus PCC 7942
Expression system: Escherichia coli BL21(DE3)
  • Canonical: P30340 (Residues: 1-122; Coverage: 100%)
Gene names: Synpcc7942_1291, smtB
Sequence domains: Bacterial regulatory protein, arsR family
Structure domains: Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain

Ligands and Environments

1 bound ligand:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: APS BEAMLINE 14-BM-D
Spacegroup: P21212
Unit cell:
a: 64.448Å b: 124.678Å c: 25.909Å
α: 90° β: 90° γ: 90°
R R work R free
0.23 0.229 0.29
Expression system: Escherichia coli BL21(DE3)