5XA5

Crystal structure of HMP-1-HMP-2 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Cell-cell adhesion in metazoans relies on evolutionarily conserved features of the alpha-catenin· beta-catenin-binding interface.

Shao, X.Kang, H.Loveless, T.Lee, G.R.Seok, C.Weis, W.I.Choi, H.J.Hardin, J.

(2017) J Biol Chem 292: 16477-16490

  • DOI: 10.1074/jbc.M117.795567
  • Primary Citation of Related Structures:  
    5XA5

  • PubMed Abstract: 
  • Stable tissue integrity during embryonic development relies on the function of the cadherin·catenin complex (CCC). The Caenorhabditis elegans CCC is a useful paradigm for analyzing in vivo requirements for specific interactions among the core components of the CCC, and it provides a unique opportunity to examine evolutionarily conserved mechanisms that govern the interaction between α- and β-catenin ...

    Stable tissue integrity during embryonic development relies on the function of the cadherin·catenin complex (CCC). The Caenorhabditis elegans CCC is a useful paradigm for analyzing in vivo requirements for specific interactions among the core components of the CCC, and it provides a unique opportunity to examine evolutionarily conserved mechanisms that govern the interaction between α- and β-catenin. HMP-1, unlike its mammalian homolog α-catenin, is constitutively monomeric, and its binding affinity for HMP-2/β-catenin is higher than that of α-catenin for β-catenin. A crystal structure shows that the HMP-1·HMP-2 complex forms a five-helical bundle structure distinct from the structure of the mammalian α-catenin·β-catenin complex. Deletion analysis based on the crystal structure shows that the first helix of HMP-1 is necessary for binding HMP-2 avidly in vitro and for efficient recruitment of HMP-1 to adherens junctions in embryos. HMP-2 Ser-47 and Tyr-69 flank its binding interface with HMP-1, and we show that phosphomimetic mutations at these two sites decrease binding affinity of HMP-1 to HMP-2 by 40-100-fold in vitro. In vivo experiments using HMP-2 S47E and Y69E mutants showed that they are unable to rescue hmp-2 ( zu364 ) mutants, suggesting that phosphorylation of HMP-2 on Ser-47 and Tyr-69 could be important for regulating CCC formation in C. elegans Our data provide novel insights into how cadherin-dependent cell-cell adhesion is modulated in metazoans by conserved elements as well as features unique to specific organisms.


    Organizational Affiliation

    Program in Cellular and Molecular Biology, University of Wisconsin-Madison, Madison, Wisconsin 53706.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-catenin-like protein hmp-1A279Caenorhabditis elegansMutation(s): 0 
Gene Names: hmp-1R13H4.4
UniProt
Find proteins for P90947 (Caenorhabditis elegans)
Explore P90947 
Go to UniProtKB:  P90947
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-catenin-like protein hmp-2B48Caenorhabditis elegansMutation(s): 0 
Gene Names: hmp-2K05C4.6
UniProt
Find proteins for O44326 (Caenorhabditis elegans)
Explore O44326 
Go to UniProtKB:  O44326
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.191 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.095α = 90
b = 57.095β = 90
c = 155.436γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
PHASERphasing
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-30
    Type: Initial release
  • Version 1.1: 2017-09-06
    Changes: Database references
  • Version 1.2: 2019-12-25
    Changes: Database references