1M93

1.65 A Structure of Cleaved Viral Serpin CRMA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.188 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structure of viral serpin crmA provides insights into its mechanism of cysteine proteinase inhibition

Simonovic, M.Gettins, P.G.W.Volz, K.

(2000) Protein Sci 9: 1423-1427

  • DOI: 10.1110/ps.9.8.1423
  • Primary Citation of Related Structures:  
    1M93, 1C8O

  • PubMed Abstract: 
  • 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 ...

    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.


    Related Citations: 
    • Crystallization and preliminary X-ray diffraction analysis of a recombinant cysteine-free mutant of crmA
      Simonovic, M., Gettins, P.G.W., Volz, K.
      (2000) Acta Crystallogr D Biol Crystallogr 56: 1440

    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, College of Medicine, University of Illinois at Chicago, 60612-7334, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine proteinase inhibitor 2A55Cowpox virusMutation(s): 0 
Gene Names: CRMA
UniProt
Find proteins for P07385 (Cowpox virus (strain Brighton Red))
Explore P07385 
Go to UniProtKB:  P07385
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Serine proteinase inhibitor 2B245Cowpox virusMutation(s): 6 
Gene Names: CRMA
UniProt
Find proteins for P07385 (Cowpox virus (strain Brighton Red))
Explore P07385 
Go to UniProtKB:  P07385
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Serine proteinase inhibitor 2C41Cowpox virusMutation(s): 3 
Gene Names: CRMA
UniProt
Find proteins for P07385 (Cowpox virus (strain Brighton Red))
Explore P07385 
Go to UniProtKB:  P07385
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download Ideal Coordinates CCD File 
D [auth A]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.52α = 90
b = 92.59β = 90
c = 100.63γ = 90
Software Package:
Software NamePurpose
SHELXL-97refinement
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-05
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection, Refinement description