Rab coupling associates with phagosomes and regulates recycling from the phagosomal compartement

DAMIANI MT AND PAVAROTTI M; LEIVA N; LINDSAY AJ; MCCAFFREY MW; COLOMBO MI

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Blackwell Munksgaard

Lugar: Copenhagen, Denmark; Año: 2004 vol. 5 p. 785 - 797

1398-9219

Novel protein that belongs to the Rab11-FIP family. RCP interacts specifically with Rab4 and Rab11, small guanosine-triphosphatases that function as regulators along the endosomal recycling pathway. We used fluorescence confocal microscopy and biochemical approaches to evaluate the participation of RCP during particle uptake and phagosome maturation. In macrophages, RCP is predominantly membrane-bound and displays a punctuate vesicular pattern throughout the cytoplasm. RCP is mainly associated with transferrin-containing structures and Rab11-labeled endosomes. Overexpression of H13, the carboxyl-terminal region of RCP that contains the Rab binding domain, results in an abnormal endosomal compartment. Interestingly, we found that RCP is associated as discrete patches or protein domains to early phagosomal membranes. In macrophages, overexpression of full-length RCP stimulates recycling from the phagosomal compartment,whereas overexpression of H13 diminishes this vesicular transport step. It is likely that acting as an intermediate between Rab4 and Rab11, RCP regulates membrane flux along the phagocytic pathway via recycling