1GVZ

Prostate Specific Antigen (PSA) from stallion seminal plasma


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.42 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal Structure of a Prostate Kallikrein Isolated from Stallion Seminal Plasma: A Homologue of Human Psa

Carvalho, A.L.Sanz, L.Barettino, D.Romero, A.Calvete, J.J.Romao, M.J.

(2002) J Mol Biol 322: 325

  • DOI: 10.1016/s0022-2836(02)00705-2
  • Primary Citation of Related Structures:  
    1GVZ

  • PubMed Abstract: 
  • Prostate-specific kallikrein, a member of the gene family of serine proteases, was initially discovered in semen and is the most useful serum marker for prostate cancer diagnosis and prognosis. We report the crystal structure at 1.42A resolution of horse prostate kallikrein (HPK) ...

    Prostate-specific kallikrein, a member of the gene family of serine proteases, was initially discovered in semen and is the most useful serum marker for prostate cancer diagnosis and prognosis. We report the crystal structure at 1.42A resolution of horse prostate kallikrein (HPK). This is the first structure of a serine protease purified from seminal plasma. HPK shares extensive sequence homology with human prostate-specific antigen (PSA), including a predicted chymotrypsin-like specificity, as suggested by the presence of a serine residue at position S1 of the specificity pocket. In contrast to other kallikreins, HPK shows a structurally distinct specificity pocket. Its entrance is blocked by the kallikrein loop, suggesting a possible protective or substrate-selective role for this loop. The HPK structure seems to be in an inactivated state and further processing might be required to allow the binding of substrate molecules. Crystal soaking experiments revealed a binding site for Zn(2+) and Hg(2+), two known PSA inhibitors.


    Organizational Affiliation

    REQUIMTE/CQFB, Departamento de Química, Fac de Ciencias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
KALLIKREIN-1E2A237Equus caballusMutation(s): 0 
Gene Names: KLK1E2
EC: 3.4.21.35
UniProt
Find proteins for Q6H321 (Equus caballus)
Explore Q6H321 
Go to UniProtKB:  Q6H321
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6H321
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.42 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.668α = 90
b = 79.104β = 98.21
c = 45.783γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-09-12
    Type: Initial release
  • Version 1.1: 2011-09-21
    Changes: Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance