4UU5

CRYSTAL STRUCTURE OF THE PDZ DOMAIN OF PALS1 IN COMPLEX WITH THE CRB PEPTIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.23 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

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This is version 2.0 of the entry. See complete history


Literature

Structures of the human Pals1 PDZ domain with and without ligand suggest gated access of Crb to the PDZ peptide-binding groove.

Ivanova, M.E.Fletcher, G.C.O'Reilly, N.Purkiss, A.G.Thompson, B.J.McDonald, N.Q.

(2015) Acta Crystallogr D Biol Crystallogr 71: 555-564

  • DOI: 10.1107/S139900471402776X
  • Primary Citation of Related Structures:  
    4UU5, 4UU6

  • PubMed Abstract: 
  • Many components of epithelial polarity protein complexes possess PDZ domains that are required for protein interaction and recruitment to the apical plasma membrane. Apical localization of the Crumbs (Crb) transmembrane protein requires a PDZ-mediated interaction with Pals1 (protein-associated with Lin7, Stardust, MPP5), a member of the p55 family of membrane-associated guanylate kinases (MAGUKs) ...

    Many components of epithelial polarity protein complexes possess PDZ domains that are required for protein interaction and recruitment to the apical plasma membrane. Apical localization of the Crumbs (Crb) transmembrane protein requires a PDZ-mediated interaction with Pals1 (protein-associated with Lin7, Stardust, MPP5), a member of the p55 family of membrane-associated guanylate kinases (MAGUKs). This study describes the molecular interaction between the Crb carboxy-terminal motif (ERLI), which is required for Drosophila cell polarity, and the Pals1 PDZ domain using crystallography and fluorescence polarization. Only the last four Crb residues contribute to Pals1 PDZ-domain binding affinity, with specificity contributed by conserved charged interactions. Comparison of the Crb-bound Pals1 PDZ structure with an apo Pals1 structure reveals a key Phe side chain that gates access to the PDZ peptide-binding groove. Removal of this side chain enhances the binding affinity by more than fivefold, suggesting that access of Crb to Pals1 may be regulated by intradomain contacts or by protein-protein interaction.


    Organizational Affiliation

    Structural Biology Laboratories, Cancer Research UK, 44 Lincoln's Inn Fields, London WC2A 3LY, England.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MAGUK P55 SUBFAMILY MEMBER 5A90Homo sapiensMutation(s): 0 
Gene Names: MPP5PALS1
UniProt & NIH Common Fund Data Resources
Find proteins for Q8N3R9 (Homo sapiens)
Explore Q8N3R9 
Go to UniProtKB:  Q8N3R9
PHAROS:  Q8N3R9
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN CRUMBS HOMOLOG 1B17Homo sapiensMutation(s): 0 
Gene Names: CRB1
UniProt & NIH Common Fund Data Resources
Find proteins for P82279 (Homo sapiens)
Explore P82279 
Go to UniProtKB:  P82279
PHAROS:  P82279
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.23 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: P 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.73α = 90
b = 74.73β = 90
c = 42.71γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-03-11
    Changes: Database references
  • Version 1.2: 2015-03-25
    Changes: Database references
  • Version 2.0: 2018-02-28
    Changes: Atomic model, Database references