2D26

Active site distortion is sufficient for proteinase inhibit second crystal structure of covalent serpin-proteinase complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.251 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Active Site Distortion Is Sufficient for Proteinase Inhibition by Serpins: Structure of the covalent complex of alpha 1-proteinase inhibitor with porcine pancreatic elastase

Dementiev, A.Dobo, J.Gettins, P.G.

(2006) J.Biol.Chem. 281: 3452-3457

  • DOI: 10.1074/jbc.M510564200

  • PubMed Abstract: 
  • We report here the x-ray structure of a covalent serpin-proteinase complex, alpha1-proteinase inhibitor (alpha1PI) with porcine pancreatic elastase (PPE), which differs from the only other x-ray structure of such a complex, that of alpha1PI with tryp ...

    We report here the x-ray structure of a covalent serpin-proteinase complex, alpha1-proteinase inhibitor (alpha1PI) with porcine pancreatic elastase (PPE), which differs from the only other x-ray structure of such a complex, that of alpha1PI with trypsin, in showing nearly complete definition of the proteinase. alpha1PI complexes with trypsin, PPE, and human neutrophil elastase (HNE) showed similar rates of deacylation and enhanced susceptibility to proteolysis by exogenous proteinases in solution. The differences between the two x-ray structures therefore cannot arise from intrinsic differences in the inhibition mechanism. However, self-proteolysis of purified complex resulted in rapid cleavage of the trypsin complex, slower cleavage of the PPE complex, and only minimal cleavage of the HNE complex. This suggests that the earlier alpha1 PI-trypsin complex may have been proteolyzed and that the present structure is more likely to be representative of serpin-proteinase complexes. The present structure shows that active site distortion alone is sufficient for inhibition and suggests that enhanced proteolysis is not necessarily exploited in vivo.


    Organizational Affiliation

    Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, Illinois 60607, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-1-antitrypsin
A
358Homo sapiensMutation(s): 7 
Gene Names: SERPINA1 (AAT, PI)
Find proteins for P01009 (Homo sapiens)
Go to Gene View: SERPINA1
Go to UniProtKB:  P01009
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Alpha-1-antitrypsin
B
36Homo sapiensMutation(s): 3 
Gene Names: SERPINA1 (AAT, PI)
Find proteins for P01009 (Homo sapiens)
Go to Gene View: SERPINA1
Go to UniProtKB:  P01009
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Elastase-1
C
240Sus scrofaMutation(s): 0 
Gene Names: CELA1 (ELA1)
EC: 3.4.21.36
Find proteins for P00772 (Sus scrofa)
Go to Gene View: CELA1
Go to UniProtKB:  P00772
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.251 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 109.830α = 90.00
b = 85.180β = 121.01
c = 76.260γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CNSrefinement
HKL-2000data collection
HKL-2000data scaling
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-29
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance