>cd01865 Rab3 Rab3 subfamily. The Rab3 subfamily contains Rab3A, Rab3B, Rab3C, and Rab3D. All four isoforms were found in mouse brain and endocrine tissues, with varying levels of expression. Rab3A, Rab3B, and Rab3C localized to synaptic and secretory vesicles; Rab3D was expressed at high levels only in adipose tissue, exocrine glands, and the endocrine pituitary, where it is localized to cytoplasmic secretory granules. Rab3 appears to control Ca2+-regulated exocytosis. The appropriate GDP/GTP exchange cycle of Rab3A is required for Ca2+-regulated exocytosis to occur, and interaction of the GTP-bound form of Rab3A with effector molecule(s) is widely believed to be essential for this process. Functionally, most studies point toward a role for Rab3 in the secretion of hormones and neurotransmitters. GTPase activating proteins (GAPs) interact with GTP-bound Rab and accelerate the hydrolysis of GTP to GDP. Guanine nucleotide exchange factors (GEFs) interact with GDP-bound Rabs to promot

Probab=91.24  E-value=0.4  Score=27.23  Aligned_cols=18  Identities=44%  Similarity=0.752  Sum_probs=15.7

Q ss_pred             EEEEECCCCCCCHHHHHH
Q ss_conf             365524778861158999
Q gi|254780617|r  164 RELIIGDRKTGKTSIILD  181 (509)
Q Consensus       164 R~~I~g~~g~GKt~l~~~  181 (509)
T Consensus         3 KivllGd~~VGKTsli~r   20 (165)
T cd01865           3 KLLIIGNSSVGKTSFLFR   20 (165)
T ss_pred             EEEEECCCCCCHHHHHHH
T ss_conf             999999999688999999