1R8N

The Crystal Structure of the Kunitz (STI) Type Inhibitor from Seeds of Delonix regia


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 

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This is version 1.3 of the entry. See complete history


Literature

Crystal structure of the Kunitz (STI)-type inhibitor from Delonix regia seeds.

Krauchenco, S.Pando, S.C.Marangoni, S.Polikarpov, I.

(2003) Biochem Biophys Res Commun 312: 1303-1308

  • DOI: https://doi.org/10.1016/j.bbrc.2003.11.062
  • Primary Citation of Related Structures:  
    1R8N

  • PubMed Abstract: 

    The three-dimensional structure of a novel Kunitz (STI) family member, an inhibitor purified from Delonix regia seeds (DrTI), was solved by molecular replacement method and refined, respectively, to R(factor) and R(free) values of 21.5% and 25.3% at 1.75A resolution. The structure has a classical beta-trefoil fold, however, differently from canonical Kunitz type (STI) inhibitors, its reactive site loop has an insertion of one residue, Glu68, between the residues P1 and P2. Surprisingly, DrTI is an effective inhibitor of trypsin and human plasma kallikrein, but not of chymotrypsin and tissue kallikrein. Putative structural grounds of such specificity are discussed.


  • Organizational Affiliation

    Instituto de Física de São Carlos, USP, Av. Trabalhador Saocarlense, 400, CEP 13560-970, São Carlos, SP, Brazil.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kunitz trypsin inhibitor185Delonix regiaMutation(s): 0 
UniProt
Find proteins for P83667 (Delonix regia)
Explore P83667 
Go to UniProtKB:  P83667
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83667
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.125α = 90
b = 67.249β = 90
c = 72.061γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

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: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Refinement description