X-ray structure of a prolactin antagonist

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.221 

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Structural and thermodynamic bases for the design of pure prolactin receptor antagonists: X-ray structure of Del1-9-G129R-hPRL.

Jomain, J.B.Tallet, E.Broutin, I.Hoos, S.van Agthoven, J.Ducruix, A.Kelly, P.A.Kragelund, B.B.England, P.Goffin, V.

(2007) J Biol Chem 282: 33118-33131

  • DOI: https://doi.org/10.1074/jbc.M704364200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Competitive antagonists of the human prolactin (hPRL) receptor are a novel class of molecules of potential therapeutic interest in the context of cancer. We recently developed the pure antagonist Del1-9-G129R-hPRL by deleting the nine N-terminal residues of G129R-hPRL, a first generation partial antagonist. We determined the crystallographic structure of Del1-9-G129R-hPRL, which revealed no major change compared with wild type hPRL, indicating that its pure antagonistic properties are intrinsically due to the mutations. To decipher the molecular bases of pure antagonism, we compared the biological, physicochemical, and structural properties of numerous hPRL variants harboring N-terminal or Gly(129) mutations, alone or combined. The pure versus partial antagonistic properties of the multiple hPRL variants could not be correlated to differences in their affinities toward the hPRL receptor, especially at site 2 as determined by surface plasmon resonance. On the contrary, residual agonism of the hPRL variants was found to be inversely correlated to their thermodynamic stability, which was altered by all the Gly(129) mutations but not by those involving the N terminus. We therefore propose that residual agonism can be abolished either by further disrupting hormone site 2-receptor contacts by N-terminal deletion, as in Del1-9-G129R-hPRL, or by stabilizing hPRL and constraining its intrinsic flexibility, as in G129V-hPRL.

  • Organizational Affiliation

    INSERM U845, Centre de Recherche Croissance et Signalisation, Equipe PRL, GH et Tumeurs, Faculté de Médecine Necker, 156 Rue de Vaugirard, Paris Cedex 15, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Prolactin191Homo sapiensMutation(s): 2 
Gene Names: PRL
UniProt & NIH Common Fund Data Resources
Find proteins for P01236 (Homo sapiens)
Explore P01236 
Go to UniProtKB:  P01236
PHAROS:  P01236
GTEx:  ENSG00000172179 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01236
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.221 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.59α = 90
b = 122.59β = 90
c = 28.68γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
ADSCdata collection
MOSFLMdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Database references
  • Version 1.3: 2023-08-30
    Changes: Data collection, Refinement description