1CGI

THREE-DIMENSIONAL STRUCTURE OF THE COMPLEXES BETWEEN BOVINE CHYMOTRYPSINOGEN*A AND TWO RECOMBINANT VARIANTS OF HUMAN PANCREATIC SECRETORY TRYPSIN INHIBITOR (KAZAL-TYPE)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Observed: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Three-dimensional structure of the complexes between bovine chymotrypsinogen A and two recombinant variants of human pancreatic secretory trypsin inhibitor (Kazal-type).

Hecht, H.J.Szardenings, M.Collins, J.Schomburg, D.

(1991) J Mol Biol 220: 711-722

  • DOI: 10.1016/0022-2836(91)90112-j
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Variants of the human pancreatic secretory trypsin inhibitor (PSTI) have been created during a protein design project to generate a high-affinity inhibitor with respect to some serine proteases other than trypsin. Two modified versions of human PSTI ...

    Variants of the human pancreatic secretory trypsin inhibitor (PSTI) have been created during a protein design project to generate a high-affinity inhibitor with respect to some serine proteases other than trypsin. Two modified versions of human PSTI with high affinity for chymotrypsin were crystallized as a complex with chymotrypsinogen. Both crystallize isomorphously in space group P4(1)2(1)2 with lattice constants a = 84.4 A, c = 86.7 A and diffract to 2.3 A resolution. The structure was solved by molecular replacement. The final R-value after refinement with 8.0 to 2.3 A resolution data was 19.5% for both complexes after inclusion of about 50 bound water molecules. The overall three-dimensional structure of PSTI is similar to the structure of porcine PSTI in the trypsinogen complex (1TGS). Small differences in the relative orientation of the binding loop and the core of the inhibitors indicate flexible adaptation to the proteases. The chymotrypsinogen part of the complex is similar to chymotrypsin. After refolding induced by binding of the inhibitor the root-mean-square difference of the active site residues A186 to A195 and A217 to A222 compared to chymotrypsin was 0.26 A.


    Organizational Affiliation

    GBF (Gesellschaft für Biotechnologische Forschung), Department of Molecular Structure Research, Braunschweig, Germany.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-CHYMOTRYPSINOGENE245Bos taurusMutation(s): 0 
EC: 3.4.21.1
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PANCREATIC SECRETORY TRYPSIN INHIBITOR (KAZAL TYPE) VARIANT 3I56Homo sapiensMutation(s): 0 
Gene Names: SPINK1PSTI
Find proteins for P00995 (Homo sapiens)
Explore P00995 
Go to UniProtKB:  P00995
NIH Common Fund Data Resources
PHAROS  P00995
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Observed: 0.195 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.4α = 90
b = 84.4β = 90
c = 86.7γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance