>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=99.02 E-value=2.2e-09 Score=80.79 Aligned_cols=153 Identities=19% Similarity=0.199 Sum_probs=95.7 Q ss_pred EEEEECCCCCCHHHHHHHHHHHCCCCCCCCCCCCEECCCCHHHHHCCCEEEEEEEEEEECCEEEEEECCCCCCCCHHHHH Q ss_conf 49998546898778899999983961423220000038857798709606467999998997999972898754079999 Q gi|254780233|r 21 NIAIIAHVDHGKTTLVDELLKQSGVFRDNQRVSERVMDCNDLEKERGITILAKVTSIVWNDVRINIVDTPGHADFGGEVE 100 (624) Q Consensus 21 NiaIiaHvDhGKTTL~d~LL~~sG~~~~~~~v~~~vmD~~~~EreRGITI~a~~~~~~~~~~~iNiiDTPGH~DF~gEVe 100 (624) T Consensus 3 KivllGd~~VGKTsli~r~~--~~~f~~~y~~--T----------ig~~~~~k~i~~~~~~i~l~iwDtaGqe~~~~l~~ 68 (165) T cd01865 3 KLLIIGNSSVGKTSFLFRYA--DDSFTSAFVS--T----------VGIDFKVKTVFRNDKRVKLQIWDTAGQERYRTITT 68 (165) T ss_pred EEEEECCCCCCHHHHHHHHH--CCCCCCCCCC--C----------CCEEEEEEEEEECCEEEEEEEEECCCCCCCCCCHH T ss_conf 99999999968899999992--4988997688--7----------63787999999999999999996999834554415 Q ss_pred HHHHHHCEEEEEEECCCCCCHHHH---HHHHHHH-HC---CCCEEEEEECCCCCCCCHHHHHHHHHHHHHHCCCCHHHCC Q ss_conf 998742178999976878864789---9999999-72---9978999975436674025689999988862267301104 Q gi|254780233|r 101 RILCMVESVVVLVDAAEGPMPQTK---FVVGKAL-KI---GLRPIVVVNKVDRSDARADEVINEVFDLFSALDATDAQLD 173 (624) Q Consensus 101 r~l~~~DgaiLvVdA~eGv~~QT~---~vl~~A~-~~---~l~~IvvINKiDr~~a~~~~v~~ei~dlf~~l~a~de~ld 173 (624) T Consensus 69 ~y~~~a~~~ilvydit~~---~Sf~~~~~w~~~i~~~~~~~~~iilvgNK~DL~~~r~v~-~~~~~~~a-------~~~~ 137 (165) T cd01865 69 AYYRGAMGFILMYDITNE---ESFNAVQDWSTQIKTYSWDNAQVILVGNKCDMEDERVVS-SERGRQLA-------DQLG 137 (165) T ss_pred HHHHCCCEEEEEECCCCH---HHHHHHHHHHHHHHHHCCCCCEEEEEECCCCHHHCCCCC-HHHHHHHH-------HHCC T ss_conf 441135448998517887---999999999999998689872599960242355518899-99999999-------9869 Q ss_pred HHHHHHHHHCCEECCCCCCCCCCCCHHHHHHHHCCC Q ss_conf 266887886591646742233486413555321024 Q gi|254780233|r 174 FPILYGSGRFGWMSDSSDGSRDQGMVPLLNLIVDHV 209 (624) Q Consensus 174 ~Pv~~~Sa~~G~~~~~~~~~~~~gl~~Lld~Ii~~i 209 (624) T Consensus 138 ~~~~E~SAk~~-----------~nV~e~F~~l~~~i 162 (165) T cd01865 138 FEFFEASAKEN-----------INVKQVFERLVDII 162 (165) T ss_pred CEEEEECCCCC-----------CCHHHHHHHHHHHH T ss_conf 97999768989-----------08899999999999

HHsearch alignment for GI: 254780233 and conserved domain: cd01865