Editing Vacuolar Fusion Protein CCZ1 Homolog B(CCZ1B)

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Summary	C7orf28B Belongs to the CCZ1 family.In worms deficient in either sand-1 or ccz-1, apoptotic cells are internalized and the phagosomes recruit the small GTPase RAB-5 but fail to progress to the subsequent RAB-7(+) stage. The mammalian orthologues of SAND-1, namely Mon1a and Mon1b, were similarly required for phagosome maturation. Mechanistically, Mon1 interacts with GTP-bound Rab5, identifying Mon1 as a previously unrecognized Rab5 effector. Moreover, a Mon1-Ccz1 complex (but not either protein alone) could bind Rab7 and could also influence Rab7 activation, suggesting Mon1-Ccz1 as an important link in progression from the Rab5-positive stage to the Rab7-positive stage of phagosome maturation. Taken together, these data identify SAND-1 (Mon1) and CCZ-1 (Ccz1) as critical and evolutionarily conserved components regulating the processing of ingested apoptotic cell corpses.
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