>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=97.97 E-value=0.00033 Score=48.14 Aligned_cols=148 Identities=18% Similarity=0.224 Sum_probs=85.5 Q ss_pred CEEEEEECCCCCHHHHHHHHHCCCCCCCCCCCCCCCCCCEEEEECCCHHHHHHHHHCCCCEEEEEEEEEEECCCCCCCCC Q ss_conf 24867528887888999987404898736668674488337997685558777642186502335799985122354322 Q gi|254780226|r 3 FKCGIIGLPNVGKSTLFNALTRTASAQAANYPFCTIEPNSGEVAVPDPRMHKLAEIAESKDLVPTRMSFVDIAGLVRGAS 82 (367) Q Consensus 3 ~kiGlvG~pn~GKST~f~alT~~~~~~~~~ypFtTi~pn~g~~~v~d~~~~~l~~~~~~~~~~p~~i~~iDvaGLv~gA~ 82 (367) T Consensus 2 ~KivllGd~~VGKTsli~r~~~~-~-f~~~y~-~Tig~~~~~k~i~----------~~~~---~i~l~iwDtaGq----e 61 (165) T cd01865 2 FKLLIIGNSSVGKTSFLFRYADD-S-FTSAFV-STVGIDFKVKTVF----------RNDK---RVKLQIWDTAGQ----E 61 (165) T ss_pred EEEEEECCCCCCHHHHHHHHHCC-C-CCCCCC-CCCCEEEEEEEEE----------ECCE---EEEEEEEECCCC----C T ss_conf 89999999996889999999249-8-899768-8763787999999----------9999---999999969998----3 Q ss_pred CCCCCHHHHHHHHHCCCEEEEEECCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHH Q ss_conf 24663289999873037478850123454211345776732157889888876433222457777787520320467778 Q gi|254780226|r 83 KGEGLGNQFLAHIREVDAIIHVLRCFKDENIIHVEGRIDPINDIETIETELMLSDLERLERLFEKNKKYRNHKSEEIVLL 162 (367) Q Consensus 83 ~G~GlGN~FL~~ir~aDalihVVdaf~~~~v~~~~g~~DP~~Di~~i~~EL~l~dle~lek~~~k~~k~~~~~~~~~~~~ 162 (367) T Consensus 62 ~~~~l~~~---y~~~a~~~ilvydit~~~S-------------f~------------~~~-~w~---------------- 96 (165) T cd01865 62 RYRTITTA---YYRGAMGFILMYDITNEES-------------FN------------AVQ-DWS---------------- 96 (165) T ss_pred CCCCCHHH---HHHCCCEEEEEECCCCHHH-------------HH------------HHH-HHH---------------- T ss_conf 45544154---4113544899851788799-------------99------------999-999---------------- Q ss_pred HHHHHHHHHHHHCCCCCHHHHHHCCHHHHHHHHHHHHHHHCCCHHEECCCHHHHCCCHHHHHHHHHHHHHCCCCCCCCCC Q ss_conf 99999889988758741034431326777621023576410100100343011101013467877886436984033210 Q gi|254780226|r 163 QSIISSSLRLIEEGKPVRSLLESLDSDAIPIFKSLNLLTAKPILYICNVSEHDCKKGNIYTEAVQRLASQQNAEMIIISA 242 (367) Q Consensus 163 ~~~l~~~~~~Le~~~~~r~~~~~~~~de~~~l~~~~llt~KP~iivaNk~e~~~~~~n~~~e~i~~l~~~~~~~~i~isa 242 (367) T Consensus 97 --------~~i~---------------------~~~-~~~~~iilvgNK~DL~~~r-~v~~~~~~~~a~~~~~~~~E~SA 145 (165) T cd01865 97 --------TQIK---------------------TYS-WDNAQVILVGNKCDMEDER-VVSSERGRQLADQLGFEFFEASA 145 (165) T ss_pred --------HHHH---------------------HHC-CCCCEEEEEECCCCHHHCC-CCCHHHHHHHHHHCCCEEEEECC T ss_conf --------9999---------------------868-9872599960242355518-89999999999986997999768 Q ss_pred HHHH Q ss_conf 0246 Q gi|254780226|r 243 AIEA 246 (367) Q Consensus 243 ~~E~ 246 (367) T Consensus 146 k~~~ 149 (165) T cd01865 146 KENI 149 (165) T ss_pred CCCC T ss_conf 9890

HHsearch alignment for GI: 254780226 and conserved domain: cd01865