2DXB image
Entry Detail
PDB ID:
2DXB
Keywords:
HYDROLASE
Title:
Recombinant thiocyanate hydrolase comprising partially-modified cobalt centers
Biological Source:
Source Organism:
Thiobacillus thioparus
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2006-08-25
Release Date:
2007-08-28
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.25 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 21
2DXB validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Thiocyanate hydrolase subunit alpha
Chain IDs:A, D, G, J, M, P, S, V
Chain Length:126
Number of Molecules:8
Biological Source:Thiobacillus thioparus
UniProt ID:O66187 Pfam ID:PF02211 EC:3.5.5.8
Protein Blast
Polymer Type:polypeptide(L)
Description:Thiocyanate hydrolase subunit beta
Chain IDs:B, E, H, K, N, Q, T, W
Chain Length:157
Number of Molecules:8
Biological Source:Thiobacillus thioparus
UniProt ID:O66186 Pfam ID:PF21006 EC:3.5.5.8
Protein Blast
Polymer Type:polypeptide(L)
Description:Thiocyanate hydrolase subunit gamma
Chain IDs:C, F, I, L, O, R, U, X
Chain Length:243
Number of Molecules:8
Biological Source:Thiobacillus thioparus
UniProt ID:O66188 Pfam ID:PF02979 EC:3.5.5.8
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CSD C CYS 3-SULFINOALANINE
CSO C CYS S-HYDROXYCYSTEINE
Ligand Molecules
3CO
PO4
Primary Citation
Structural Basis for Catalytic Activation of Thiocyanate Hydrolase Involving Metal-Ligated Cysteine Modification
J.Am.Chem.Soc. 131 14838 14843 (2009)
PMID: 19785438 DOI: 10.1021/ja903979s

Abstact

Thiocyanate hydrolase (SCNase) is a member of a family of nitrile hydratase proteins, each of which contains a unique noncorrin cobalt center with two post-translationally modified cysteine ligands, cysteine-sulfenic acid or -sulfenate (Cys-SO(H)), and cysteine-sulfininate (Cys-SO(2)(-)), respectively. We have found that a partially matured recombinant SCNase was activated during storage. The crystal structures of SCNase before and after storage demonstrated that Cys-SO(2)(-) modification of gammaCys131 proceeded to completion prior to storage, while Cys-SO(H) modification of gammaCys133 occurred during storage. SCNase activity was suppressed when gammaCys133 was further oxidized to Cys-SO(2)(-). The correlation between the catalytic activity and the extent of the gammaCys133 modification indicates that the cysteine sulfenic acid modification of gammaCys133 is of primary importance in determining the activity of SCNase.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
2DXC
2DD5
2DD4