1R8O image
Deposition Date 2003-10-27
Release Date 2004-05-25
Last Version Date 2024-10-30
Entry Detail
PDB ID:
1R8O
Keywords:
HYDROLASE INHIBITOR
Title:
Crystal structure of an unusual Kunitz-type trypsin inhibitor from Copaifera langsdorffii seeds
Biological Source:
Source Organism:
Copaifera langsdorffii (Taxon ID: 280048)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.83 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 43 21 2
1R8O validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Kunitz trypsin inhibitor
Chain IDs:A
Chain Length:96
Number of Molecules:1
Biological Source:Copaifera langsdorffii
Polymer Type:polypeptide(L)
Molecule:Kunitz trypsin inhibitor
Chain IDs:B
Chain Length:71
Number of Molecules:1
Biological Source:Copaifera langsdorffii
Primary Citation
Three-dimensional structure of an unusual Kunitz (STI) type trypsin inhibitor from Copaifera langsdorffii.
Biochimie 86 167 172 (2004)
PMID: 15134830 DOI: 10.1016/j.biochi.2004.03.004

Abstact

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.

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Primary Citation of related structures
1R8N