7T7A

Crystal Structure of Human SHOC2: A Leucine-Rich Repeat Protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure-function analysis of the SHOC2-MRAS-PP1C holophosphatase complex.

Kwon, J.J.Hajian, B.Bian, Y.Young, L.C.Amor, A.J.Fuller, J.R.Fraley, C.V.Sykes, A.M.So, J.Pan, J.Baker, L.Lee, S.J.Wheeler, D.B.Mayhew, D.L.Persky, N.S.Yang, X.Root, D.E.Barsotti, A.M.Stamford, A.W.Perry, C.K.Burgin, A.McCormick, F.Lemke, C.T.Hahn, W.C.Aguirre, A.J.

(2022) Nature 609: 408-415

  • DOI: https://doi.org/10.1038/s41586-022-04928-2
  • Primary Citation of Related Structures:  
    7T7A, 7UPI

  • PubMed Abstract: 

    Receptor tyrosine kinase (RTK)-RAS signalling through the downstream mitogen-activated protein kinase (MAPK) cascade regulates cell proliferation and survival. The SHOC2-MRAS-PP1C holophosphatase complex functions as a key regulator of RTK-RAS signalling by removing an inhibitory phosphorylation event on the RAF family of proteins to potentiate MAPK signalling 1 . SHOC2 forms a ternary complex with MRAS and PP1C, and human germline gain-of-function mutations in this complex result in congenital RASopathy syndromes 2-5 . However, the structure and assembly of this complex are poorly understood. Here we use cryo-electron microscopy to resolve the structure of the SHOC2-MRAS-PP1C complex. We define the biophysical principles of holoenzyme interactions, elucidate the assembly order of the complex, and systematically interrogate the functional consequence of nearly all of the possible missense variants of SHOC2 through deep mutational scanning. We show that SHOC2 binds PP1C and MRAS through the concave surface of the leucine-rich repeat region and further engages PP1C through the N-terminal disordered region that contains a cryptic RVXF motif. Complex formation is initially mediated by interactions between SHOC2 and PP1C and is stabilized by the binding of GTP-loaded MRAS. These observations explain how mutant versions of SHOC2 in RASopathies and cancer stabilize the interactions of complex members to enhance holophosphatase activity. Together, this integrative structure-function model comprehensively defines key binding interactions within the SHOC2-MRAS-PP1C holophosphatase complex and will inform therapeutic development .


  • Organizational Affiliation

    Cancer Program, Broad Institute of MIT and Harvard, Cambridge, MA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leucine-rich repeat protein SHOC-2
A, B
494Homo sapiensMutation(s): 0 
Gene Names: SHOC2KIAA0862
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UQ13 (Homo sapiens)
Explore Q9UQ13 
Go to UniProtKB:  Q9UQ13
PHAROS:  Q9UQ13
GTEx:  ENSG00000108061 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UQ13
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.205 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.93α = 90
b = 103.03β = 101.928
c = 121.09γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
XDSdata scaling
MOSFLMdata reduction
Cootmodel building
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other privateUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2022-05-04
    Type: Initial release
  • Version 1.1: 2022-08-17
    Changes: Database references
  • Version 1.2: 2022-09-21
    Changes: Database references
  • Version 1.3: 2024-05-22
    Changes: Data collection