FUNCTION: Possesses GTPase activator activity towards RAB32, RAB33B and RAB38 (PubMed:26620560, PubMed:21808068). Regulates the trafficking of melanogenic enzymes TYR, TYRP1 and DCT/TYRP2 to melanosomes in melanocytes by inactivating RAB32 and RAB38. Inhibits RAB32 and RAB38 activation both directly...
FUNCTION: Possesses GTPase activator activity towards RAB32, RAB33B and RAB38 (PubMed:26620560, PubMed:21808068). Regulates the trafficking of melanogenic enzymes TYR, TYRP1 and DCT/TYRP2 to melanosomes in melanocytes by inactivating RAB32 and RAB38. Inhibits RAB32 and RAB38 activation both directly by promoting their GTPase activity and indirectly by disrupting the RAB9A-HPS4 interaction which is required for RAB32/38 activation (PubMed:26620560). {ECO:0000269|PubMed:21808068, ECO:0000269|PubMed:26620560}.
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GO - Biological processes (BP):
activation of GTPase activity [GO:0090630]; late endosome to Golgi transport [GO:0034499]; positive regulation of GTPase activity [GO:0043547]...
activation of GTPase activity [GO:0090630]; late endosome to Golgi transport [GO:0034499]; positive regulation of GTPase activity [GO:0043547]
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GO - Molecular function (MF):
GTPase activator activity [GO:0005096]; small GTPase binding [GO:0031267]...
GTPase activator activity [GO:0005096]; small GTPase binding [GO:0031267]
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GO - Cellular component (CC):
cytoplasm [GO:0005737]; melanosome [GO:0042470]...
cytoplasm [GO:0005737]; melanosome [GO:0042470]
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