1R8O

Crystal structure of an unusual Kunitz-type trypsin inhibitor from Copaifera langsdorffii seeds


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

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This is version 1.2 of the entry. See complete history


Literature

Three-dimensional structure of an unusual Kunitz (STI) type trypsin inhibitor from Copaifera langsdorffii.

Krauchenco, S.Nagem, R.A.P.Da Silva, J.A.Marangoni, S.Polikarpov, I.

(2004) Biochimie 86: 167-172

  • DOI: 10.1016/j.biochi.2004.03.004
  • Primary Citation of Related Structures:  
    1R8O

  • PubMed Abstract: 
  • The crystallographic structure of a novel trypsin inhibitor (CTI) from Copaifera langsdorffii is reported. The structure was solved by MIRAS procedure and refined to a crystallographic residual of 17.3% (R(free) = 20.3%) at 1.8 A resolution. Two isomorphous derivatives were obtained by quick cryo-soaking approach ...

    The crystallographic structure of a novel trypsin inhibitor (CTI) from Copaifera langsdorffii is reported. The structure was solved by MIRAS procedure and refined to a crystallographic residual of 17.3% (R(free) = 20.3%) at 1.8 A resolution. Two isomorphous derivatives were obtained by quick cryo-soaking approach. CTI is the first structure of a member of Kunitz (STI) family formed by two noncovalently bound polypeptide chains and only one disulfide bridge. A standard Kunitz-type inhibitor has a single polypeptide chain and two disulfide bridges. Structural features granting CTI high inhibitory activity are discussed.


    Related Citations: 
    • Crystallization and preliminary X-ray diffraction analysis of a novel tryspin inhibitor from seeds of Copaifera langsdorffii
      Krauchenco, S., Silva, J.A., Nagem, R.A.P., Brando Neto, J.R., Forrer, V.P., Carmona e Ferreira, R., Macedo, M.L.R., Novello, J.C., Marangoni, S., Polikarpov, I.
      (2001) Acta Crystallogr D Biol Crystallogr 57: 1316
    • Biochemical characterization and N-terminal sequences of two new trypsin inhibitors from Copaifera langsdorffii seeds
      da Silva, J.A., Macedo, M.L.R., Novello, J.C., Marangoni, S.
      (2001) J Protein Chem 20: 1

    Organizational Affiliation

    Grupo de Cristalografia, Department of Physics and Informatics, Institute of Physics (IFSC), University of Sao Paulo, Avenue Trabalhador Saocarlense, 400, CEP 13560-970, Sao Carlos, SP, Brazil.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Kunitz trypsin inhibitorA96Copaifera langsdorffiiMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Kunitz trypsin inhibitorB71Copaifera langsdorffiiMutation(s): 0 
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.71α = 90
b = 58.71β = 90
c = 93.75γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-05-25
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance