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J Biol Chem 2007 Oct 05;28240:29504-13. doi: 10.1074/jbc.M705825200.
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A role for myosin 1e in cortical granule exocytosis in Xenopus oocytes.

Schietroma C , Yu HY , Wagner MC , Umbach JA , Bement WM , Gundersen CB .

Xenopus oocytes undergo dynamic structural changes during maturation and fertilization. Among these, cortical granule exocytosis and compensatory endocytosis provide effective models to study membrane trafficking. This study documents an important role for myosin 1e in cortical granule exocytosis. Myosin 1e is expressed at the earliest stage that cortical granule exocytosis can be detected in oocytes. Prior to exocytosis, myosin 1e relocates to the surface of cortical granules. Overexpression of myosin 1e augments the kinetics of cortical granule exocytosis, whereas tail-derived fragments of myosin 1e inhibit this secretory event (but not constitutive exocytosis). Finally, intracellular injection of myosin 1e antibody inhibits cortical granule exocytosis. Further experiments identified cysteine string proteins as interacting partners for myosin 1e. As constituents of the membrane of cortical granules, cysteine string proteins are also essential for cortical granule exocytosis. Future investigation of the link between myosin 1e and cysteine string proteins should help to clarify basic mechanisms of regulated exocytosis.

PubMed ID: 17702742
PMC ID: PMC2820112
Article link: J Biol Chem
Grant support: [+]

Species referenced: Xenopus
Genes referenced: dnajc5 myo1c myo1d myo1e.2
Antibodies: Dnajc5 Ab2 Dolichos bifluros lectin Myo1D Ab1 Myo1c Ab2 Myo1e.2 Ab1 Myo1e.2 Ab2

References [+] :
Barylko, Structure, function, and regulation of myosin 1C. 2005, Pubmed