[No authors listed]
ALS2, the causative gene product for juvenile recessive amyotrophic lateral sclerosis (ALS2), is a guanine-nucleotide exchange factor for the small GTPase Rab5. Here, we report a novel ALS2 homologous gene, ALS2 C-terminal like (ALS2CL), which encodes a 108-kD ALS2CL protein. ALS2CL exhibited a specific but a relatively weak Rab5-GEF activity with accompanying rather strong Rab5-binding properties. In HeLa cells, co-expression of ALS2CL and Rab5A resulted in a unique tubulation phenotype of endosome compartments with significant colocalization of ALS2CL and Rab5A. These results suggest that ALS2CL is a novel factor modulating the Rab5-mediated endosome dynamics in the cells.
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