Crystal structure of the human cell polarity protein Lethal Giant Larvae 2 (Lgl2). aPKC phosphorylated, crystal form 2.

Experimental Data Snapshot

  • Resolution: 1.91 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Structural insights into the aPKC regulatory switch mechanism of the human cell polarity protein lethal giant larvae 2.

Almagor, L.Ufimtsev, I.S.Ayer, A.Li, J.Weis, W.I.

(2019) Proc Natl Acad Sci U S A 116: 10804-10812

  • DOI: https://doi.org/10.1073/pnas.1821514116
  • Primary Citation of Related Structures:  
    6N8P, 6N8Q, 6N8R, 6N8S

  • PubMed Abstract: 

    Metazoan cell polarity is controlled by a set of highly conserved proteins. Lethal giant larvae (Lgl) functions in apical-basal polarity through phosphorylation-dependent interactions with several other proteins as well as the plasma membrane. Phosphorylation of Lgl by atypical protein kinase C (aPKC), a component of the partitioning-defective (Par) complex in epithelial cells, excludes Lgl from the apical membrane, a crucial step in the establishment of epithelial cell polarity. We present the crystal structures of human Lgl2 in both its unphosphorylated and aPKC-phosphorylated states. Lgl2 adopts a double β-propeller structure that is unchanged by aPKC phosphorylation of an unstructured loop in its second β-propeller, ruling out models of phosphorylation-dependent conformational change. We demonstrate that phosphorylation controls the direct binding of purified Lgl2 to negative phospholipids in vitro. We also show that a coil-helix transition of this region that is promoted by phosphatidylinositol 4,5-bisphosphate (PIP 2 ) is also phosphorylation-dependent, implying a highly effective phosphorylative switch for membrane association.

  • Organizational Affiliation

    Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lethal(2) giant larvae protein homolog 2979Homo sapiensMutation(s): 0 
Gene Names: LLGL2
UniProt & NIH Common Fund Data Resources
Find proteins for Q6P1M3 (Homo sapiens)
Explore Q6P1M3 
Go to UniProtKB:  Q6P1M3
GTEx:  ENSG00000073350 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6P1M3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.91 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 173.57α = 90
b = 46.562β = 115.84
c = 137.228γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)United StatesMH58570

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-08
    Type: Initial release
  • Version 1.1: 2019-05-29
    Changes: Data collection, Database references
  • Version 1.2: 2019-06-12
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references