3TC2

Crystal structure of potato serine protease inhibitor.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of a post-translationally processed heterodimeric double-headed Kunitz-type serine protease inhibitor from potato.

Meulenbroek, E.M.Thomassen, E.A.Pouvreau, L.Abrahams, J.P.Gruppen, H.Pannu, N.S.

(2012) Acta Crystallogr.,Sect.D 68: 794-799

  • DOI: 10.1107/S090744491201222X

  • PubMed Abstract: 
  • 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 proteas ...

    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.


    Organizational Affiliation

    Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kunitz-type proteinase inhibitor P1H5
A, B, C
187Solanum tuberosumMutation(s): 0 
Gene Names: KTI-B
Find proteins for Q8S380 (Solanum tuberosum)
Go to UniProtKB:  Q8S380
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.168 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 54.822α = 90.00
b = 93.920β = 100.69
c = 55.442γ = 90.00
Software Package:
Software NamePurpose
BALBESphasing
MOSFLMdata reduction
REFMACrefinement
ADSCdata collection
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-20
    Type: Initial release
  • Version 1.1: 2014-04-16
    Type: Database references