6533b858fe1ef96bd12b6296

RESEARCH PRODUCT

MyRIP, a novel Rab effector, enables myosin VIIa recruitment to retinal melanosomes

Aziz El-amraouiStéphane BlanchardUwe WolfrumClaire DesnosPolonca Küssel-andermannJean-pierre HenryChristine PetitFrançois DarchenJean-sébastien Schonn

subject

Molecular Sequence Datamacromolecular substancesMyosinsBiologyBiochemistryRetinarab27 GTP-Binding ProteinsMotor proteinMicechemistry.chemical_compoundTwo-Hybrid System Techniquesotorhinolaryngologic diseasesGeneticsmedicineAnimalsHumansAmino Acid SequenceRAB27Molecular BiologyGene LibraryMelanosomesRetinal pigment epitheliumScientific ReportsDyneinsRetinalActin cytoskeletonCell biologymedicine.anatomical_structurechemistryOrgan Specificityrab GTP-Binding ProteinsMelanosome transportMyosin VIIaMelanophilinsense organsRabSequence Alignmentcirculatory and respiratory physiology

description

Defects of the myosin VIIa motor protein cause deafness and retinal anomalies in humans and mice. We report on the identification of a novel myosin-VIIa-interacting protein that we have named MyRIP (myosin-VIIa- and Rab-interacting protein), since it also binds to Rab27A in a GTP-dependent manner. In the retinal pigment epithelium cells, MyRIP, myosin VIIa and Rab27A are associated with melanosomes. In transfected PC12 cells, overexpression of MyRIP was shown to interfere with the myosin VIIa tail localization. We propose that a molecular complex composed of Rab27A, MyRIP and myosin VIIa bridges retinal melanosomes to the actin cytoskeleton and thereby mediates the local trafficking of these organelles. The defect of this molecular complex is likely to account for the perinuclear mislocalization of the melanosomes observed in the retinal pigment epithelium cells of myosinVIIa-defective mice.

https://doi.org/10.1093/embo-reports/kvf090