3U7D

Crystal structure of the KRIT1/CCM1 FERM domain in complex with the heart of glass (HEG1) cytoplasmic tail


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of the junctional anchorage of the cerebral cavernous malformations complex.

Gingras, A.R.Liu, J.J.Ginsberg, M.H.

(2012) J.Cell Biol. 199: 39-48

  • DOI: 10.1083/jcb.201205109

  • PubMed Abstract: 
  • The products of genes that cause cerebral cavernous malformations (CCM1/KRIT1, CCM2, and CCM3) physically interact. CCM1/KRIT1 links this complex to endothelial cell (EC) junctions and maintains junctional integrity in part by inhibiting RhoA. Heart ...

    The products of genes that cause cerebral cavernous malformations (CCM1/KRIT1, CCM2, and CCM3) physically interact. CCM1/KRIT1 links this complex to endothelial cell (EC) junctions and maintains junctional integrity in part by inhibiting RhoA. Heart of glass (HEG1), a transmembrane protein, associates with KRIT1. In this paper, we show that the KRIT1 band 4.1, ezrin, radixin, and moesin (FERM) domain bound the HEG1 C terminus (K(d) = 1.2 ┬ÁM) and solved the structure of this assembly. The KRIT1 F1 and F3 subdomain interface formed a hydrophobic groove that binds HEG1(Tyr(1,380)-Phe(1,381)), thus defining a new mode of FERM domain-membrane protein interaction. This structure enabled design of KRIT1(L717,721A), which exhibited a >100-fold reduction in HEG1 affinity. Although well folded and expressed, KRIT1(L717,721A) failed to target to EC junctions or complement the effects of KRIT1 depletion on zebrafish cardiovascular development or Rho kinase activation in EC. These data establish that this novel FERM-membrane protein interaction anchors CCM1/KRIT1 at EC junctions to support cardiovascular development.


    Organizational Affiliation

    Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Krev interaction trapped protein 1
A, C
322Homo sapiensMutation(s): 0 
Gene Names: KRIT1 (CCM1)
Find proteins for O00522 (Homo sapiens)
Go to Gene View: KRIT1
Go to UniProtKB:  O00522
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein HEG homolog 1
B, D
26Homo sapiensMutation(s): 0 
Gene Names: HEG1 (KIAA1237)
Find proteins for Q9ULI3 (Homo sapiens)
Go to Gene View: HEG1
Go to UniProtKB:  Q9ULI3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.49 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.234 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 73.050α = 90.00
b = 76.820β = 113.62
c = 79.180γ = 90.00
Software Package:
Software NamePurpose
MxCuBEdata collection
MOSFLMdata reduction
REFMACrefinement
PHASERphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-09-12
    Type: Initial release
  • Version 1.1: 2012-10-17
    Type: Database references
  • Version 1.2: 2013-02-27
    Type: Other