>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=99.32 E-value=5.8e-11 Score=93.07 Aligned_cols=154 Identities=23% Similarity=0.313 Sum_probs=99.5 Q ss_pred EEEEECCCCCCHHHHHHHHHHHCCCCCCCCCCCEEECCCHHHHHHCCEEEEEEEEEEEECCCCCEEEEEEEECCCCCHHH Q ss_conf 79998013898778899999982980544443113058677987195052327999974378843899996178730027 Q gi|254780321|r 13 NFSIVAHIDHGKSTLADRFIQHCRGLTEREMSSQVLDNMDIERERGITIKAQTVRLNYTSTDAKDYQLNLIDTPGHVDFT 92 (606) Q Consensus 13 N~~IiaHvDhGKTTL~d~lL~~tg~i~~~~~~~~vlD~~~~EreRGITIka~~~~~~~~~~~~~~y~iNlIDTPGH~DF~ 92 (606) T Consensus 3 KivllGd~~VGKTsli~r~~--~~~f~~~y~-~Ti----------g~~~~~k~i-----~~~~~~i~l~iwDtaGqe~~~ 64 (165) T cd01865 3 KLLIIGNSSVGKTSFLFRYA--DDSFTSAFV-STV----------GIDFKVKTV-----FRNDKRVKLQIWDTAGQERYR 64 (165) T ss_pred EEEEECCCCCCHHHHHHHHH--CCCCCCCCC-CCC----------CEEEEEEEE-----EECCEEEEEEEEECCCCCCCC T ss_conf 99999999968899999992--498899768-876----------378799999-----999999999999699983455 Q ss_pred HHHHHHHHHCCEEEEEEECCCCCCHHHHHHHHH-HHHC---CCCEEEEECCCCCCCCCCCC--HHHHHHHHHHHHHHHHH Q ss_conf 999999973026899998687886558999999-9970---99679983267887532113--38887755532232100 Q gi|254780321|r 93 YEVSRSLSACEGSLLVVDATQGVEAQTLANVYQ-AIDN---NHEIITVLNKADLPSADPDR--VKKQIEETIGISTEDAL 166 (606) Q Consensus 93 ~EV~r~l~a~dgaiLvVdA~~Gvq~QT~~~~~~-A~~~---~l~~I~viNKiD~~~A~~e~--v~~ei~~~~g~~~~~ii 166 (606) T Consensus 65 ~l~~~y~~~a~~~ilvydit~~~Sf~~~~~w~~~i~~~~~~~~~iilvgNK~DL~~~r~v~~~~~~~~a~~~~~---~~~ 141 (165) T cd01865 65 TITTAYYRGAMGFILMYDITNEESFNAVQDWSTQIKTYSWDNAQVILVGNKCDMEDERVVSSERGRQLADQLGF---EFF 141 (165) T ss_pred CCHHHHHHCCCEEEEEECCCCHHHHHHHHHHHHHHHHHCCCCCEEEEEECCCCHHHCCCCCHHHHHHHHHHCCC---EEE T ss_conf 44154411354489985178879999999999999986898725999602423555188999999999998699---799 Q ss_pred HHHHHCCCCCCHHHHHHHHHH Q ss_conf 011100223200678776321 Q gi|254780321|r 167 LVSAKTGEGIPLLLERIVQQL 187 (606) Q Consensus 167 ~vSAktG~GV~~LLd~Iv~~i 187 (606) T Consensus 142 E~SAk~~~nV~e~F~~l~~~i 162 (165) T cd01865 142 EASAKENINVKQVFERLVDII 162 (165) T ss_pred EECCCCCCCHHHHHHHHHHHH T ss_conf 976898908899999999999

HHsearch alignment for GI: 254780321 and conserved domain: cd01865