1PI2

REACTIVE SITES OF AN ANTICARCINOGENIC BOWMAN-BIRK PROTEINASE INHIBITOR ARE SIMILAR TO OTHER TRYPSIN INHIBITORS

• PDB DOI: https://doi.org/10.2210/pdb1PI2/pdb

• Classification: SERINE PROTEINASE INHIBITOR
• Organism(s): Glycine max
• Mutation(s): No 


• Deposited: 1991-03-26 Released: 1992-04-15 
• Deposition Author(s): Chen, P., Rose, J., Wang, B.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Observed: 
  0.236 (Depositor) 

Literature

Reactive sites of an anticarcinogenic Bowman-Birk proteinase inhibitor are similar to other trypsin inhibitors.

Chen, P., Rose, J., Love, R., Wei, C.H., Wang, B.C.

(1992) J Biol Chem 267: 1990-1994

• PubMed: 1730730 
• DOI: https://doi.org/10.2210/pdb1pi2/pdb
• Primary Citation of Related Structures:  
  1PI2


• PubMed Abstract: 
  

  The three-dimensional structure of the Bowman-Birk type proteinase inhibitor (PI-II) has been determined by x-ray crystallography and refined at 2.5-A resolution. This protein is a specific inhibitor of trypsin. Two reactive site loops, one at each end of the PI-II molecule, are structurally similar to each other and to reactive-site loops of pancreatic secretory trypsin inhibitor (Bolognesi, M., Gatti, G., Menegatti, E., Guarneri, M., Marquart, M., Papamokos, E., and Huber, R. (1982) J. Mol. Biol. 162, 839-869) and bovine pancreatic trypsin inhibitor (Deisenhofer, J., and Steigemann, W. (1975) Acta Crystallogr. B31, 238-250). PI-II is the first reported Bowman-Birk type inhibitor structure to be refined at high resolution, providing further insight into inhibitor mechanisms.

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Organizational Affiliation: 

Department of Crystallography, University of Pittsburgh, Pennsylvania 15260.

Biological Assembly 1  

Global Symmetry: Dihedral - D3  (Explore in 3D)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 7.21 kDa 
• Atom Count: 461 
• Modelled Residue Count: 61 
• Deposited Residue Count: 63 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BOWMAN-BIRK INHIBITOR (PI-II)	A	63	Glycine max	Mutation(s): 0
UniProt
Find proteins for P01064 (Glycine max) Explore P01064  Go to UniProtKB:  P01064

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Observed: 0.236 (Depositor) 

Space Group: P 4₁ 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.96	α = 90
b = 89.96	β = 90
c = 89.96	γ = 90

Software Package:

Software Name	Purpose
GPRLSA	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1992-04-15 
Deposition Author(s): Chen, P., Rose, J., Wang, B.C.

Revision History  

• Version 1.0: 1992-04-15
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-06-05
  Changes: Data collection, Database references, Other
• Version 1.4: 2024-10-09
  Changes: Structure summary