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PDZD7-MYO7A complex identified in enriched stereocilia membranes.

eLife | Aug 15, 2016

While more than 70 genes have been linked to deafness, most of which are expressed in mechanosensory hair cells of the inner ear, a challenge has been to link these genes into molecular pathways. One example is Myo7a (myosin VIIA), in which deafness mutations affect the development and function of the mechanically sensitive stereocilia of hair cells. We describe here a procedure for the isolation of low-abundance protein complexes from stereocilia membrane fractions. Using this procedure, combined with identification and quantitation of proteins with mass spectrometry, we demonstrate that MYO7A forms a complex with PDZD7, a paralog of USH1C and DFNB31. MYO7A and PDZD7 interact in tissue-culture cells, and co-localize to the ankle-link region of stereocilia in wild-type but not Myo7a mutant mice. Our data thus describe a new paradigm for the interrogation of low-abundance protein complexes in hair cell stereocilia and establish an unanticipated link between MYO7A and PDZD7.

Pubmed ID: 27525485 RIS Download

Mesh terms: Animals | Carrier Proteins | Mass Spectrometry | Membranes | Mice | Myosins | Protein Binding | Stereocilia

Data used in this publication

None found

Associated grants

  • Agency: NIDCD NIH HHS, Id: R01 DC014427
  • Agency: NEI NIH HHS, Id: P30 EY010572
  • Agency: NIDCD NIH HHS, Id: R01 DC005575
  • Agency: NIH HHS, Id: S10 OD012246
  • Agency: NIDCD NIH HHS, Id: P30 DC005983
  • Agency: NIDCD NIH HHS, Id: R01 DC002368
  • Agency: NCI NIH HHS, Id: P30 CA069533

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