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 

wwPDB Validation 3D Report Full Report


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:  

  • 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-mediate ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MAGUK P55 SUBFAMILY MEMBER 5
A
90Homo sapiensMutation(s): 0 
Gene Names: MPP5
Find proteins for Q8N3R9 (Homo sapiens)
Go to Gene View: MPP5
Go to UniProtKB:  Q8N3R9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN CRUMBS HOMOLOG 1
B
17Homo sapiensMutation(s): 0 
Gene Names: CRB1
Find proteins for P82279 (Homo sapiens)
Go to Gene View: CRB1
Go to UniProtKB:  P82279
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
PUN
Query on PUN

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Download CCD File 
A
2,2,4,4,6,6,8-heptamethylnonane
C16 H34
RDUBCTHNBWFPTP-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SME
Query on SME
B
L-PEPTIDE LINKINGC5 H11 N O3 SMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.23 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.168 
  • Space Group: P 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 74.730α = 90.00
b = 74.730β = 90.00
c = 42.710γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
XSCALEdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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