1MTN

BOVINE ALPHA-CHYMOTRYPSIN:BPTI CRYSTALLIZATION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.240 

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This is version 1.4 of the entry. See complete history


Literature

Crystal structure of the bovine alpha-chymotrypsin:Kunitz inhibitor complex. An example of multiple protein:protein recognition sites.

Capasso, C.Rizzi, M.Menegatti, E.Ascenzi, P.Bolognesi, M.

(1997) J Mol Recognit 10: 26-35

  • DOI: https://doi.org/10.1002/(SICI)1099-1352(199701/02)10:1<26::AID-JMR351>3.0.CO;2-N
  • Primary Citation of Related Structures:  
    1MTN

  • PubMed Abstract: 

    The crystal structure of bovine alpha-chymotrypsin (alpha-CHT) in complex with the bovine basic pancreatic trypsin inhibitor (BPTI) has been solved and refined at 2.8 A resolution (R-factor = 0.18). The proteinase:inhibitor complex forms a compact dimer (two alpha-CHT and two BPTI molecules), which may be stabilized by surface-bound sulphate ions, in the crystalline state. Each BPTI molecule, at opposite ends, is contacting both proteinase molecules in the dimer, through the reactive site loop and through residues next to the inhibitor's C-terminal region. Specific recognition between alpha-CHT and BPTI occurs at the (re)active site interface according to structural rules inferred from the analysis of homologous serine proteinase:inhibitor complexes. Lys15, the P1 residue of BPTI, however, does not occupy the alpha-CHT S1 specificity pocket, being hydrogen bonded to backbone atoms of the enzyme surface residues Gly216 and Ser217.


  • Organizational Affiliation

    Centro Biotecnologie Avanzate IST, Università di Genova, Italy; C.N.R. Istituto di Biochimica delle Proteine ed Enzimologia, Fuorigrotta Napoli, Italy.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN
A, E
13Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
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Go to UniProtKB:  P00766
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UniProt GroupP00766
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN
B, F
131Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN
C, G
97Bos taurusMutation(s): 0 
EC: 3.4.21.1
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
BASIC PANCREATIC TRYPSIN INHIBITOR
D, H
58Bos taurusMutation(s): 0 
UniProt
Find proteins for P00974 (Bos taurus)
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UniProt GroupP00974
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.240 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.45α = 90
b = 102.45β = 90
c = 207.57γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
AMoREphasing
TNTrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-08-17
    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: 2018-03-21
    Changes: Advisory, Data collection
  • Version 1.4: 2023-08-09
    Changes: Advisory, Database references, Derived calculations, Refinement description