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
  • Primary Citation of Related Structures:  
    6BA6

  • 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 GTPase ...

    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 Biochemistry, Case Western Reserve University, Cleveland, OH, 44106, USA. qinj@ccf.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Talin-1 A93Mus musculusMutation(s): 0 
Gene Names: Tln1Tln
Find proteins for P26039 (Mus musculus)
Explore P26039 
Go to UniProtKB:  P26039
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ras-related protein Rap-1b B168Homo sapiensMutation(s): 1 
Gene Names: RAP1BOK/SW-cl.11
EC: 3.6.5.2
Find proteins for P61224 (Homo sapiens)
Explore P61224 
Go to UniProtKB:  P61224
NIH Common Fund Data Resources
PHAROS:  P61224
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: 20 structures for lowest energy 
  • OLDERADO: 6BA6 Olderado

Structure Validation

View Full Validation Report



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
    Changes: Author supporting evidence, Data collection