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  • Clinician Researcher
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  • Retired scientist
  • Technician
  • Undergraduate Student
  • Veterinary
  • Visiting Scientist
  • Deputy Director of Center
  • Deputy Director of Department
  • Deputy Director of National Reference Center
  • Deputy Head of Facility
  • Director of Center
  • Director of Department
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Scientific Fields
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Published in Frontiers in molecular biosciences - 01 Jan 2022

Colcombet-Cazenave B, Cordier F, Zhu Y, Bouvier G, Litsardaki E, Laserre L, Prevost MS, Raynal B, Caillet-Saguy C, Wolff N,

Link to Pubmed [PMID] – 35836927

Link to DOI – 10.3389/fmolb.2022.923740

Front Mol Biosci 2022 ; 9(): 923740

Hearing relies on the transduction of sound-evoked vibrations into electrical signals, occurring in the stereocilia bundle of inner ear hair cells. The G protein-coupled receptor (GPCR) ADGRV1 and the multi-PDZ protein PDZD7 play a critical role in the formation and function of stereocilia through their scaffolding and signaling properties. During hair cell development, the GPCR activity of ADGRV1 is specifically inhibited by PDZD7 through an unknown mechanism. Here, we describe the key interactions mediated by the two N-terminal PDZ domains of PDZD7 and the cytoplasmic domain of ADGRV1. Both PDZ domains can bind to the C-terminal PDZ binding motif (PBM) of ADGRV1 with the critical contribution of atypical C-terminal β extensions. The two PDZ domains form a supramodule in solution, stabilized upon PBM binding. Interestingly, we showed that the stability and binding properties of the PDZ tandem are affected by two deafness-causing mutations located in the binding grooves of PDZD7 PDZ domains.

https://pubmed.ncbi.nlm.nih.gov/35836927