ISDA

Entry Detail

PDB ID:

1KNG

Keywords:

OXIDOREDUCTASE

Title:

Crystal structure of CcmG reducing oxidoreductase at 1.14 A

Biological Source:

Source Organism:

Bradyrhizobium japonicum

Host Organism:

Escherichia coli BL21(DE3)

PDB Version:

Deposition Date:

2001-12-18

Release Date:

2002-07-17

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.14 Å

R-Value Free:

0.15

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:THIOL:DISULFIDE INTERCHANGE PROTEIN CYCY
Chain IDs:A
Chain Length:156
Number of Molecules:1
Biological Source:Bradyrhizobium japonicum

UniProt ID:P30960 Pfam ID:PF08534

Primary Citation

Structure of CcmG/DsbE at 1.14 A resolution: high-fidelity reducing activity in an indiscriminately oxidizing environment

Edeling, M.A, Guddat, L.W, Fabianek, R.A, Thony-Meyer, L, Martin, J.L, Edeling, M.A, Guddat, L.W, Fabianek, R.A, Halliday, J.A, Jones, A, Thony-Meyer, L, Martin, J.L, Fabianek, R.A, Huber-Wunderlich, M, Glockshuber, R, Kunzler, P, Hennecke, H, Thony-Meyer, L, Fabianek, R.A, Hennecke, H, Thony-Meyer, L.Show

Structure 10 973 979 (2002)

PMID: 12121652 DOI: 10.1016/S0969-2126(02)00794-3

Abstact

CcmG is unlike other periplasmic thioredoxin (TRX)-like proteins in that it has a specific reducing activity in an oxidizing environment and a high fidelity of interaction. These two unusual properties are required for its role in c-type cytochrome maturation. The crystal structure of CcmG reveals a modified TRX fold with an unusually acidic active site and a groove formed from two inserts in the fold. Deletion of one of the groove-forming inserts disrupts c-type cytochrome formation. Two unique structural features of CcmG-an acidic active site and an adjacent groove-appear to be necessary to convert an indiscriminately binding scaffold, the TRX fold, into a highly specific redox protein.

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