>cd04109 Rab28 Rab28 subfamily. First identified in maize, Rab28 has been shown to be a late embryogenesis-abundant (Lea) protein that is regulated by the plant hormone abcisic acid (ABA). In Arabidopsis, Rab28 is expressed during embryo development and is generally restricted to provascular tissues in mature embryos. Unlike maize Rab28, it is not ABA-inducible. Characterization of the human Rab28 homolog revealed two isoforms, which differ by a 95-base pair insertion, producing an alternative sequence for the 30 amino acids at the C-terminus. The two human isoforms are presumbly the result of alternative splicing. Since they differ at the C-terminus but not in the GTP-binding region, they are predicted to be targeted to different cellular locations. 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 promote the formation of the GTP-bound state. Rabs

Probab=99.54 E-value=1.6e-13 Score=107.28 Aligned_cols=152 Identities=19% Similarity=0.203 Sum_probs=96.6 Q ss_pred EEEECCCCCCHHHHHHHHHCCCEEEECCCCCCEE-EEEEEEEEE-C--CEEEEEEECCCCHHHCCCCCCCCCCHHHHHHH Q ss_conf 9983389986889999986892021058888602-127899973-9--94899998798401012357532100234555 Q gi|254780941|r 25 VALVGATNAGKSTLVNRFVGAKVSIVTHKVQTTR-SIVRGIVSE-K--ESQIVFLDTPGIFNAKDSYHKLMIRLSWSTIK 100 (311) Q Consensus 25 VaivG~pN~GKSTL~N~l~g~~vsivS~k~~TTr-~~i~gi~~~-~--~~qiifvDTPG~~~~~~~l~~~~~~~~~~~l~ 100 (311) T Consensus 3 vvllGd~~VGKTSli~rf~~~~F~--~~y~~TiG~d~~~k~i~i~~~~~v~l~iwDtaGqe--------~~~~~~~~y~~ 72 (215) T cd04109 3 IVVLGDGAVGKTSLCRRFAKEGFG--KSYKQTIGLDFFSKRVTLPGNLNVTLQVWDIGGQS--------IGGKMLDKYIY 72 (215) T ss_pred EEEECCCCCCHHHHHHHHHHCCCC--CCCCCCCCEEEEEEEEEECCCCEEEEEEEECCCCC--------CHHHHHHHHHH T ss_conf 999999997099999999749898--87788655788999999879946999999699850--------02378999997 Q ss_pred HHHHHCCCCHHHHHHHCC-HHHHHHHHHH----C--CCCCEEEEEECCCHHHHHH-HHHHHHHHHCCCCCCCCCCCCCCC Q ss_conf 532100110000100000-0012234544----2--8720257872110104345-788886410012334311000138 Q gi|254780941|r 101 HADIVCLVVDSHRELKVN-IHDLLKEIAK----R--SSRLILILNKIDCVKPERL-LEQAEIANKLVFIEKTFMVSATKG 172 (311) Q Consensus 101 ~aDiil~VvDa~~~~~~~-~~~il~~l~~----~--~~p~IiVlNKiDlv~~~~l-~~~~~~~~~~~~~~~i~~ISAk~g 172 (311) T Consensus 73 ~a~~~ilVYDitn~~SF~~l~~W~~~i~~~~~~~~~~~~iiLVGNK~DL~~~R~Vs~ee~~~~A~~~g~-~f~E~SAktg 151 (215) T cd04109 73 GAHAVFLVYDVTNSQSFENLEDWYSMVRKVLKSSETQPLVVLVGNKTDLEHNRTVKDDKHARFAQANGM-ESCLVSAKTG 151 (215) T ss_pred HHCCEEEECCCCCHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEECCCHHHHCCCCHHHHHHHHHHCCC-EEEEEECCCC T ss_conf 515137741478678999899999999998504577852999975454286477699999999998299-8999838999 Q ss_pred CCHHHHHHHHHHHCC Q ss_conf 742678999998366 Q gi|254780941|r 173 HGCDDVLNYLCSTLP 187 (311) Q Consensus 173 ~Gid~L~~~L~~~lp 187 (311) T Consensus 152 ~nV~e~F~~la~~i~ 166 (215) T cd04109 152 DRVNLLFQQLAAELL 166 (215) T ss_pred CCHHHHHHHHHHHHH T ss_conf 498999999999997

HHsearch alignment for GI: 254780941 and conserved domain: cd04109