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Grxcr1 Promotes Hair Bundle Development by Destabilizing the Physical Interaction between Harmonin and Sans Usher Syndrome Proteins.

Cell reports | 2018

Morphogenesis and mechanoelectrical transduction of the hair cell mechanoreceptor depend on the correct assembly of Usher syndrome (USH) proteins into highly organized macromolecular complexes. Defects in these proteins lead to deafness and vestibular areflexia in USH patients. Mutations in a non-USH protein, glutaredoxin domain-containing cysteine-rich 1 (GRXCR1), cause non-syndromic sensorineural deafness. To understand the deglutathionylating enzyme function of GRXCR1 in deafness, we generated two grxcr1 zebrafish mutant alleles. We found that hair bundles are thinner in homozygous grxcr1 mutants, similar to the USH1 mutants ush1c (Harmonin) and ush1ga (Sans). In vitro assays showed that glutathionylation promotes the interaction between Ush1c and Ush1ga and that Grxcr1 regulates mechanoreceptor development by preventing physical interaction between these proteins without affecting the assembly of another USH1 protein complex, the Ush1c-Cadherin23-Myosin7aa tripartite complex. By elucidating the molecular mechanism through which Grxcr1 functions, we also identify a mechanism that dynamically regulates the formation of Usher protein complexes.

Pubmed ID: 30380418 RIS Download

Associated grants

  • Agency: NICHD NIH HHS, United States
    Id: P01 HD022486
  • Agency: NIDCD NIH HHS, United States
    Id: R01 DC004186
  • Agency: NIH HHS, United States
    Id: R24 OD011195
  • Agency: NICHD NIH HHS, United States
    Id: T32 HD007348

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This is a list of tools and resources that we have found mentioned in this publication.


GraphPad Prism (tool)

RRID:SCR_002798

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Novus Biologicals (tool)

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MDCK (tool)

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Cell line MDCK is a Spontaneously immortalized cell line with a species of origin Canis lupus familiaris

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ANXA3 Polyclonal Antibody (antibody)

RRID:AB_2759222

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Purified Rabbit Anti-GFP, Anti-GFP (antibody)

RRID:AB_10013661

This polyclonal targets Citrine, EGFP, GFP, YFP

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cadherin-23 (C-20) (antibody)

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Anti-TRAPPC3, C-Terminal antibody produced in rabbit (antibody)

RRID:AB_10745271

This polyclonal targets TRAPPC3 C-Terminal antibody produced in rabbit

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USH1G Antibody (antibody)

RRID:AB_11036031

This unknown targets USH1G

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USH1C Antibody (antibody)

RRID:AB_11017833

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420400 | Anti-KDEL Mouse mAb (10C3) (antibody)

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GRXCR1 Antibody (antibody)

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ImageJ (software resource)

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Anti-TRAPPC3, C-Terminal antibody produced in rabbit (antibody)

RRID:AB_10745271

This polyclonal targets TRAPPC3 C-Terminal antibody produced in rabbit

View all literature mentions

GRXCR1 Antibody (antibody)

RRID:AB_11028153

This unknown targets GRXCR1

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cadherin-23 (C-20) (antibody)

RRID:AB_634513

This polyclonal targets CDH23

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Purified Rabbit Anti-GFP, Anti-GFP (antibody)

RRID:AB_10013661

This polyclonal targets Citrine, EGFP, GFP, YFP

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420400 | Anti-KDEL Mouse mAb (10C3) (antibody)

RRID:AB_212090

This monoclonal targets KDEL Mouse mAb (10C3)

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USH1G Antibody (antibody)

RRID:AB_11036031

This unknown targets USH1G

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USH1C Antibody (antibody)

RRID:AB_11017833

This unknown targets USH1C

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ImageJ (software resource)

RRID:SCR_003070

Open source Java based image processing software program designed for scientific multidimensional images. ImageJ has been transformed to ImageJ2 application to improve data engine to be sufficient to analyze modern datasets.

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