Enables guanyl-nucleotide exchange factor activity. Involved in muscle cell cellular homeostasis; regulation of mitochondrion organization; and rhabdomere development. Located in cytosol; endoplasmic reticulum; and mitochondrion. Is expressed in several structures, including adult head; adult mushroom body; larval muscle cell; synaptic neuropil domain; and trunk visceral muscle primordium. Orthologous to human RAP1GDS1 (Rap1 GTPase-GDP dissociation stimulator 1).
FB Description
visceral mesodermal armadillo-repeats (vimar) encodes a protein involved in regulation of muscle homeostasis and rhabdomere development. Its expression in the visceral mesoderm is controlled by the product of bap.