>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=99.60 E-value=4.2e-15 Score=111.36 Aligned_cols=156 Identities=15% Similarity=0.161 Sum_probs=112.9 Q ss_pred EEEEECCCCCCCEEEEEECCCCCHHHHHHHCCCEECCEE------EEEC---CEEEEEECCCCCCCCCCCCCCCHHHHHH Q ss_conf 124421677753035410145401212110000001026------6329---8689982264212473116775123443 Q gi|254780648|r 162 IGIIGLPNAGKSTFLASVTRAKPKIADYPFTTLYPNLGI------VKEG---YKEFILADIPGIIKNAHQGAGIGDRFLK 232 (335) Q Consensus 162 VglVG~PNaGKSTLln~ls~ak~kIa~ypFTT~~P~lGv------v~~~---~~~~~i~D~PGlIegA~~~~glG~~FLr 232 (335) T Consensus 3 vvllGd~~VGKTSli~rf~~~~F-~~~y-----~~TiG~d~~~k~i~i~~~~~v~l~iwDtaGqe----~~~~~~~---~ 69 (215) T cd04109 3 IVVLGDGAVGKTSLCRRFAKEGF-GKSY-----KQTIGLDFFSKRVTLPGNLNVTLQVWDIGGQS----IGGKMLD---K 69 (215) T ss_pred EEEECCCCCCHHHHHHHHHHCCC-CCCC-----CCCCCEEEEEEEEEECCCCEEEEEEEECCCCC----CHHHHHH---H T ss_conf 99999999709999999974989-8877-----88655788999999879946999999699850----0237899---9 Q ss_pred HHHHHHHHHHHCCCCCCCHHHHHHHHHHHHHHHHHHHCCCC-EEEEEECCCCCCHHHH-HHHHHHHHHHCCCCEEEEECC Q ss_conf 33335788752022221101346667899877766750598-8999974658998899-999999998629948999888 Q gi|254780648|r 233 HTERTHVLLHIVSALEENVQAAYQCILDELSAYNSELRKKI-EIVGLSQIDTVDSDTL-ARKKNELATQCGQVPFEFSSI 310 (335) Q Consensus 233 hIer~~vLl~VVD~s~~d~~~~~~~I~~EL~~y~~~L~~Kp-~IIVlNKiDl~~~e~~-~~~~~~l~~~~~~~vi~ISA~ 310 (335) T Consensus 70 y~~~a~~~ilVYDitn~~SF~~l~~W~~~i~~~~~~~~~~~~iiLVGNK~DL~~~R~Vs~ee~~~~A~~~g~~f~E~SAk 149 (215) T cd04109 70 YIYGAHAVFLVYDVTNSQSFENLEDWYSMVRKVLKSSETQPLVVLVGNKTDLEHNRTVKDDKHARFAQANGMESCLVSAK 149 (215) T ss_pred HHHHHCCEEEECCCCCHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEECCCHHHHCCCCHHHHHHHHHHCCCEEEEEECC T ss_conf 99751513774147867899989999999999850457785299997545428647769999999999829989998389 Q ss_pred CCCCHHHHHHHHHHHHHHHH Q ss_conf 78899999999999998545 Q gi|254780648|r 311 TGHGIPQILECLHDKIFSIR 330 (335) Q Consensus 311 tg~GI~eL~~~I~e~L~~~r 330 (335) T Consensus 150 tg~nV~e~F~~la~~i~~~~ 169 (215) T cd04109 150 TGDRVNLLFQQLAAELLGVD 169 (215) T ss_pred CCCCHHHHHHHHHHHHHCCC T ss_conf 99498999999999997683

HHsearch alignment for GI: 254780648 and conserved domain: cd04109