2LL2

Structure of the Cx43 C-terminal domain bound to tubulin


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

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Literature

Phosphorylation controls the interaction of the connexin43 C-terminal domain with tubulin and microtubules.

Saidi Brikci-Nigassa, A.Clement, M.J.Ha-Duong, T.Adjadj, E.Ziani, L.Pastre, D.Curmi, P.A.Savarin, P.

(2012) Biochemistry 51: 4331-4342

  • DOI: 10.1021/bi201806j
  • Primary Citation of Related Structures:  
    2LL2

  • PubMed Abstract: 
  • Connexins are structurally related transmembrane proteins that assemble to form gap junction channels involved in the mediation of intercellular communication. It has been shown that the intracellular tail of connexin43 (Cx43) interacts with tubulin and ...

    Connexins are structurally related transmembrane proteins that assemble to form gap junction channels involved in the mediation of intercellular communication. It has been shown that the intracellular tail of connexin43 (Cx43) interacts with tubulin and microtubules with putative impacts on its own intracellular trafficking, its activity in channel communication, and its interference with specific growth factor signal transduction cascades. We demonstrate here that the microtubule binding of Cx43 is mainly driven by a short region of 26 amino acid residues located within the intracellular tail of Cx43. The nuclear magnetic resonance structural analysis of a peptide (K26D) corresponding to this region shows that this peptide is unstructured when free in solution and adopts a helix conformation upon binding with tubulin. In addition, the resulting K26D-tubulin molecular complex defines a new structural organization that could be shared by other microtubule partners. Interestingly, the K26D-tubulin interaction is prevented by the phosphorylation of K26D at a src kinase specific site. Altogether, the results elucidate the mechanism of the interaction of Cx43 with the microtubule cytoskeleton and propose a pathway for understanding the microtubule-dependent regulation of Cx43 gap junctional communications and the involvement of Cx43 in TGF-β signal transduction.


    Organizational Affiliation

    Institut National de la Santé et de la Recherche Médicale (INSERM), UMR829, Université Evry-Val d'Essonne, Laboratoire Structure-Activité des Biomolécules Normales et Pathologiques, Evry 91025, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gap junction alpha-1 protein A26Homo sapiensMutation(s): 0 
Gene Names: GJA1GJAL
Find proteins for P17302 (Homo sapiens)
Explore P17302 
Go to UniProtKB:  P17302
NIH Common Fund Data Resources
PHAROS:  P17302
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2LL2 Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-20
    Type: Initial release