6BD1

Complex of 14-3-3 theta with an IRSp53 peptide phosphorylated at S366


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mechanism of IRSp53 inhibition by 14-3-3.

Kast, D.J.Dominguez, R.

(2019) Nat Commun 10: 483-483

  • DOI: 10.1038/s41467-019-08317-8
  • Primary Citation of Related Structures:  
    6BCR, 6BCY, 6BD1, 6BD2, 6BQT

  • PubMed Abstract: 
  • Filopodia are precursors of dendritic spines and polarized cell migration. The I-BAR-domain protein IRSp53 is a key regulator of filopodia dynamics that couples Rho-GTPase signaling to cytoskeleton and membrane remodeling, playing essential roles in neuronal development and cell motility ...

    Filopodia are precursors of dendritic spines and polarized cell migration. The I-BAR-domain protein IRSp53 is a key regulator of filopodia dynamics that couples Rho-GTPase signaling to cytoskeleton and membrane remodeling, playing essential roles in neuronal development and cell motility. Here, we describe the structural-functional basis for 14-3-3-dependent inhibition of IRSp53. Phosphoproteomics, quantitative binding and crystallographic studies demonstrate that 14-3-3 binds to two pairs of phosphorylation sites in IRSp53. Using bicistronic expression, we obtain an IRSp53 heterodimer in which only one subunit is phosphorylated, and show that each subunit of IRSp53 independently binds one 14-3-3 dimer. A FRET-sensor assay using natively phosphorylated IRSp53 reveals opposite conformational changes upon binding of activatory (Cdc42, Eps8) or inhibitory (14-3-3) inputs. Finally, we show that 14-3-3 inhibits IRSp53 binding to membranes. Collectively, our findings support a mechanism whereby phosphorylation-dependent inhibition of IRSp53 by 14-3-3 counters membrane binding and interactions with Cdc42 and downstream cytoskeletal effectors.


    Organizational Affiliation

    Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA. droberto@pennmedicine.upenn.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
14-3-3 protein thetaA, B, E, F245Homo sapiensMutation(s): 0 
Gene Names: YWHAQ
UniProt & NIH Common Fund Data Resources
Find proteins for P27348 (Homo sapiens)
Explore P27348 
Go to UniProtKB:  P27348
PHAROS:  P27348
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin receptor substrate protein of 53 kDa, peptide (IRSp53)C, D, G, H14Homo sapiensMutation(s): 0 
Gene Names: BAIAP2
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UQB8 (Homo sapiens)
Explore Q9UQB8 
Go to UniProtKB:  Q9UQB8
PHAROS:  Q9UQB8
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
C, D, G, HL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.213 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.916α = 106.11
b = 69.301β = 95.56
c = 84.732γ = 114.87
Software Package:
Software NamePurpose
PROTEUM2data collection
PROTEUM2data processing
SAINTdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

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 StatesR01 MH087950

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-24
    Type: Initial release
  • Version 1.1: 2019-05-08
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Author supporting evidence