>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=99.37 E-value=3e-12 Score=104.77 Aligned_cols=134 Identities=19% Similarity=0.236 Sum_probs=93.3 Q ss_pred CCEEEECCCCCCHHHHHHHHHCCHHCCCCCC-CCCCEEECCCCCCCCC--EEEEEEECCHHCCCCHHHHHHHHHHHHHHH Q ss_conf 3024311466318889999855200023454-6872110001245683--589995081000241035666678889985 Q gi|254780809|r 220 YKIVILGHSNAGKSSLFNALAKKDVAIVTDI-PGTTRDVLTIDLDLEG--YLVKISDTAGIRETDDIVEKEGIKRTFLEV 296 (440) Q Consensus 220 ~~v~i~G~pN~GKSSL~N~L~~~~~aIVs~~-~GTTRD~i~~~~~i~g--~~~~l~DTaGir~t~d~IE~~GI~ra~~~i 296 (440) T Consensus 2 ~KivllGd~~VGKTsli~r~~~~~f--~~~y~~Tig~~~~~k~i~~~~~~i~l~iwDtaGqe~~~--------~l~~~y~ 71 (165) T cd01865 2 FKLLIIGNSSVGKTSFLFRYADDSF--TSAFVSTVGIDFKVKTVFRNDKRVKLQIWDTAGQERYR--------TITTAYY 71 (165) T ss_pred EEEEEECCCCCCHHHHHHHHHCCCC--CCCCCCCCCEEEEEEEEEECCEEEEEEEEECCCCCCCC--------CCHHHHH T ss_conf 8999999999688999999924988--99768876378799999999999999999699983455--------4415441 Q ss_pred HHHCCEEECCCCCCHHHHHH-------H-----CCCCCCCCCCCCCCCCCCCHH-------------HHHHHHHHHHHHH Q ss_conf 03011020135898566343-------1-----289853222233344654200-------------0001333323235 Q gi|254780809|r 297 ENADLILLLKEINSKKEISF-------P-----KNIDFIFIGTKSDLYSTYTEE-------------YDHLISSFTGEGL 351 (440) Q Consensus 297 ~~aDlil~v~D~~~~~~~~~-------~-----~~~~~i~V~NK~Dl~~~~~~~-------------~~~~ISaktg~Gi 351 (440) T Consensus 72 ~~a~~~ilvydit~~~Sf~~~~~w~~~i~~~~~~~~~iilvgNK~DL~~~r~v~~~~~~~~a~~~~~~~~E~SAk~~~nV 151 (165) T cd01865 72 RGAMGFILMYDITNEESFNAVQDWSTQIKTYSWDNAQVILVGNKCDMEDERVVSSERGRQLADQLGFEFFEASAKENINV 151 (165) T ss_pred HCCCEEEEEECCCCHHHHHHHHHHHHHHHHHCCCCCEEEEEECCCCHHHCCCCCHHHHHHHHHHCCCEEEEECCCCCCCH T ss_conf 13544899851788799999999999999868987259996024235551889999999999986997999768989088 Q ss_pred HHHHHHHHHHHH Q ss_conf 899999999963 Q gi|254780809|r 352 EELINKIKSILS 363 (440) Q Consensus 352 ~~L~~~I~~~l~ 363 (440) T Consensus 152 ~e~F~~l~~~i~ 163 (165) T cd01865 152 KQVFERLVDIIC 163 (165) T ss_pred HHHHHHHHHHHH T ss_conf 999999999996

HHsearch alignment for GI: 254780809 and conserved domain: cd01865