1C8O image
Deposition Date 2000-06-01
Release Date 2000-09-06
Last Version Date 2023-12-27
Entry Detail
PDB ID:
1C8O
Keywords:
Title:
2.9 A STRUCTURE OF CLEAVED VIRAL SERPIN CRMA
Biological Source:
Source Organism:
Cowpox virus (Taxon ID: 10243)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.28
R-Value Work:
0.22
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:ICE INHIBITOR
Gene (Uniprot):OPG199
Mutations:C93S,C102S,C124S,C223S,C269S,C298S
Chain IDs:A
Chain Length:300
Number of Molecules:1
Biological Source:Cowpox virus
Polymer Type:polypeptide(L)
Molecule:ICE INHIBITOR
Gene (Uniprot):OPG199
Mutations:C304S,C313S,C336S
Chain IDs:B
Chain Length:41
Number of Molecules:1
Biological Source:Cowpox virus
Primary Citation
Crystal structure of viral serpin crmA provides insights into its mechanism of cysteine proteinase inhibition.
Protein Sci. 9 1423 1427 (2000)
PMID: 10975564

Abstact

CrmA is an unusual viral serpin that inhibits both cysteine and serine proteinases involved in the regulation of host inflammatory and apoptosis processes. It differs from other members of the serpin superfamily by having a reactive center loop that is one residue shorter, and by its apparent inability to form SDS-stable covalent complexes with cysteine proteinases. To obtain insight into the inhibitory mechanism of crmA, we determined the crystal structure of reactive center loop-cleaved crmA to 2.9 A resolution. The structure, which is the first of a viral serpin, suggests that crmA can inhibit cysteine proteinases by a mechanism analogous to that used by other serpins against serine proteinases. However, one striking difference from other serpins, which may be significant for in vivo function, is an additional highly charged antiparallel strand for b sheet A, whose sequence and length are unique to crmA.

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