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Rab27a co-ordinates actin-dependent transport by controlling organelle-associated motors and track assembly proteins.

By Noura Alzahofi, Christopher L Robinson, Tobias Welz, Emma L Page, Deborah A Briggs, Amy K Stainthorp, James Reekes, David A Elbe, Felix Straub, Edward W. Tate, Philip S Goff, Elena V Sviderskaya, Marta Cantero, Lluis Montoliu, Maryse Bailly, Eugen Kerkhoff, Alistair N Hume

Posted 03 May 2018
bioRxiv DOI: 10.1101/314153 (published DOI: 10.1038/s41467-020-17212-6)

Cell biologists generally consider that microtubules and actin play complementary roles in long- and short-distance transport in animal cells. On the contrary, using melanosomes of melanocytes as a model, we recently discovered that motor myosin-Va, works with dynamic actin tracks, to drive long-range organelle dispersion in microtubule depleted cells. This suggests that in animals, as in yeast and plants, myosin/actin can drive long-range transport. Here we show that SPIRE1/2 and formin-1 (FMN1) proteins generate actin tracks required for myosin-Va-dependent transport in melanocytes. Moreover we show that, in addition to melanophilin/myosin-Va, Rab27a can recruit SPIRE1/2 to melanosomes, thereby integrating motor and track assembly activity at the organelle membrane. Based on this we suggest a model in which organelles and force generators (motors and track assemblers) are linked forming a cell-wide network that allows their collective activity to rapidly disperse the population of organelles long-distance throughout the cytoplasm.

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