Rab11-FIP3 localises to a Rab11-positive pericentrosomal compartment during interphase and to the cleavage furrow during cytokinesis
pmid: 15158446
Rab11-FIP3 localises to a Rab11-positive pericentrosomal compartment during interphase and to the cleavage furrow during cytokinesis
The Rab11-family interacting protein 3 (Rab11-FIP3), also known as Arfophilin and Eferin, is a Rab11 and ADP-ribosylation factor (ARF) binding protein of unknown function. Here, we sought to investigate the subcellular localisation and elucidate the function of Rab11-FIP3 in eukaryotic membrane trafficking. Utilising a polyclonal antibody specific for Rab11-FIP3, we have demonstrated by immunofluorescence microscopy that Rab11-FIP3 colocalises with Rab11 in a distinctive pericentrosomal location in A431 cells. Additionally, we found that Rab11-FIP3 localises to punctate vesicular structures dispersed throughout A431 cells. We have demonstrated that both Rab11 and Rab11-FIP3 localise to the cleavage furrow during cytokinesis, and that Rab11-FIP3 localisation is dependent on both microtubule and actin filament integrity. We show that Rab11-FIP3 does not enter brefeldin A (BFA) induced membrane tubules that are positive for the transferrin receptor (TfnR). Furthermore, we show that expression of an amino-terminally truncated mutant of Rab11-FIP3 (Rab11-FIP3((244-756))) does not inhibit transferrin (Tfn) recycling in HeLa cells. It is likely that Rab11-FIP3 is involved in trafficking events other than Tfn trafficking; these may include the transport of endosomally derived membrane to the cleavage furrow during cytokinesis.
- University College Cork Ireland
Centrosome, Brefeldin A, DNA, Complementary, ADP-Ribosylation Factors, Immunoblotting, Molecular Sequence Data, Endosomes, Actins, Microscopy, Fluorescence, Cell Line, Tumor, Mutation, Humans, Amino Acid Sequence, Cloning, Molecular, Carrier Proteins, Interphase, Cell Division, HeLa Cells, Plasmids, Protein Binding
Centrosome, Brefeldin A, DNA, Complementary, ADP-Ribosylation Factors, Immunoblotting, Molecular Sequence Data, Endosomes, Actins, Microscopy, Fluorescence, Cell Line, Tumor, Mutation, Humans, Amino Acid Sequence, Cloning, Molecular, Carrier Proteins, Interphase, Cell Division, HeLa Cells, Plasmids, Protein Binding
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