3IX0

Crystal structure of human seminal plasma protein PSP94


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of prostate secretory protein PSP94 shows an edge-to-edge association of two monomers to form a homodimer

Kumar, A.Jagtap, D.D.Mahale, S.D.Kumar, M.

(2010) J.Mol.Biol. 397: 947-956

  • DOI: 10.1016/j.jmb.2010.02.035

  • PubMed Abstract: 
  • Several recent genome-wide association studies have linked the human MSMB gene, encoding prostate secretory protein of 94 residues (PSP94), with prostate cancer susceptibility. PSP94 is one of the most abundant proteins from prostatic secretions and ...

    Several recent genome-wide association studies have linked the human MSMB gene, encoding prostate secretory protein of 94 residues (PSP94), with prostate cancer susceptibility. PSP94 is one of the most abundant proteins from prostatic secretions and a primary constituent of human semen. PSP94 suppresses tumor growth and metastasis, and its expression gradually decreases during progression of the prostate cancer. It is a rapidly evolving protein with homologues present in several species with 10 conserved cysteine residues. PSP94 homologues show high-affinity binding with different proteins from the cysteine-rich secretory protein family, some of which have been shown to be ion channel blockers. Here, we report the crystal structure of human PSP94 at 2.3 A resolution. The structure shows that the amino and the carboxyl ends of the polypeptide chain are held in close proximity facing each other. A strong hydrogen bond between these ends, which are located respectively on the first and the last beta-strands, leads to formation of an almost straight edge in PSP94 structure. Crystal structure shows that these edges from two PSP94 monomers associate in antiparallel fashion, leading to formation of a dimer. Our studies further show that dimers dissociate into monomers at acidic pH, possibly through distortion of the straight edge. Further, based on several observations, we propose that PSP94 binds to cysteine-rich secretory proteins and immunoglobulin G through the same edge, which is involved in the formation of PSP94 dimeric interface.


    Related Citations: 
    • Crystallization and preliminary X-ray diffraction analysis of human seminal plasma protein PSP94
      Kumar, M.,Jagtap, D.D.,Mahale, S.D.,Prashar, V.,Kumar, A.,Das, A.,Bihani, S.C.,Ferrer, J.L.,Hosur, M.V.,Ramanadham, M.
      (2009) Acta Crystallogr.,Sect.F 65: 389


    Organizational Affiliation

    High Pressure Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-microseminoprotein
A, B, C, D
94Homo sapiensGene Names: MSMB (PRSP)
Find proteins for P08118 (Homo sapiens)
Go to Gene View: MSMB
Go to UniProtKB:  P08118
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.211 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 107.880α = 90.00
b = 107.880β = 90.00
c = 92.130γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
MAR345dtbdata collection
MOSFLMdata reduction
PHENIXrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-02-05
    Type: Database references