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 

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


  • 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 h ...

    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 QuĂ­mica, Fac de Ciencias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
KALLIKREIN-1E2
A
237Equus caballusMutation(s): 0 
Gene Names: KLK1E2
EC: 3.4.21.35
Find proteins for Q6H321 (Equus caballus)
Go to UniProtKB:  Q6H321
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.42 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.168 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 72.668α = 90.00
b = 79.104β = 98.21
c = 45.783γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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