6BA6

Solution structure of Rap1b/talin complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: 20 structures for lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of Rap1b bound to talin reveals a pathway for triggering integrin activation.

Zhu, L.Yang, J.Bromberger, T.Holly, A.Lu, F.Liu, H.Sun, K.Klapproth, S.Hirbawi, J.Byzova, T.V.Plow, E.F.Moser, M.Qin, J.

(2017) Nat Commun 8: 1744-1744

  • DOI: 10.1038/s41467-017-01822-8

  • PubMed Abstract: 
  • Activation of transmembrane receptor integrin by talin is essential for inducing cell adhesion. However, the pathway that recruits talin to the membrane, which critically controls talin's action, remains elusive. Membrane-anchored mammalian small GTP ...

    Activation of transmembrane receptor integrin by talin is essential for inducing cell adhesion. However, the pathway that recruits talin to the membrane, which critically controls talin's action, remains elusive. Membrane-anchored mammalian small GTPase Rap1 is known to bind talin-F0 domain but the binding was shown to be weak and thus hardly studied. Here we show structurally that talin-F0 binds to human Rap1b like canonical Rap1 effectors despite little sequence homology, and disruption of the binding strongly impairs integrin activation, cell adhesion, and cell spreading. Furthermore, while being weak in conventional binary binding conditions, the Rap1b/talin interaction becomes strong upon attachment of activated Rap1b to vesicular membranes that mimic the agonist-induced microenvironment. These data identify a crucial Rap1-mediated membrane-targeting mechanism for talin to activate integrin. They further broadly caution the analyses of weak protein-protein interactions that may be pivotal for function but neglected in the absence of specific cellular microenvironments.


    Organizational Affiliation

    Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH, 44195, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Talin-1
A
93Mus musculusMutation(s): 0 
Gene Names: Tln1 (Tln)
Find proteins for P26039 (Mus musculus)
Go to UniProtKB:  P26039
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ras-related protein Rap-1b
B
168Homo sapiensMutation(s): 1 
Gene Names: RAP1B
Find proteins for P61224 (Homo sapiens)
Go to Gene View: RAP1B
Go to UniProtKB:  P61224
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: 20 structures for lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesP01HL073311

Revision History 

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2019-12-04
    Type: Author supporting evidence, Data collection