3TC2 image
Deposition Date 2011-08-08
Release Date 2012-06-20
Last Version Date 2024-11-20
Entry Detail
PDB ID:
3TC2
Title:
Crystal structure of potato serine protease inhibitor.
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.22
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Kunitz-type proteinase inhibitor P1H5
Gene (Uniprot):KTI-B
Chain IDs:A, B, C
Chain Length:187
Number of Molecules:3
Biological Source:Solanum tuberosum
Primary Citation
Structure of a post-translationally processed heterodimeric double-headed Kunitz-type serine protease inhibitor from potato.
Acta Crystallogr.,Sect.D 68 794 799 (2012)
PMID: 22751664 DOI: 10.1107/S090744491201222X

Abstact

Potato serine protease inhibitor (PSPI) constitutes about 22% of the total amount of proteins in potato tubers (cv. Elkana), making it the most abundant protease inhibitor in the plant. PSPI is a heterodimeric double-headed Kunitz-type serine protease inhibitor that can tightly and simultaneously bind two serine proteases by mimicking the substrate of the enzyme with its reactive-site loops. Here, the crystal structure of PSPI is reported, representing the first heterodimeric double-headed Kunitz-type serine protease inhibitor structure to be determined. PSPI has a β-trefoil fold and, based on the structure, two reactive-site loops bearing residues Phe75 and Lys95 were identified.

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