>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=99.45 E-value=2.4e-12 Score=102.14 Aligned_cols=164 Identities=20% Similarity=0.232 Sum_probs=99.0 Q ss_pred EEEEEEECCCCCHHHHHHHHHCCCCCCCHHHHHHH-HHCCCCEEEECC---EEEEEEECHHCCCCCCCCCHHHHHHCCCC Q ss_conf 03886403564256788765201211000245665-420231142034---06999817110444443000111000121 Q gi|255764471|r 204 LRIAVVGRPNVGKSTLINRLLGYNRLLTGSQSGIT-RDSVSISWNWKN---HPIEIFDTAGMRKPSRITESLEQKTVKKS 279 (470) Q Consensus 204 i~~~~~G~pN~GKStl~N~l~~~~r~ivs~~~GtT-rD~i~~~~~~~~---~~~~liDTaGirkk~~~~~~~E~~s~~~t 279 (470) T Consensus 1 ~KvvllGd~~VGKTSli~rf~~~~-F-~~~y~~TiG~d~~~k~i~i~~~~~v~l~iwDtaGq----------e~~~~~-~ 67 (215) T cd04109 1 FKIVVLGDGAVGKTSLCRRFAKEG-F-GKSYKQTIGLDFFSKRVTLPGNLNVTLQVWDIGGQ----------SIGGKM-L 67 (215) T ss_pred CEEEEECCCCCCHHHHHHHHHHCC-C-CCCCCCCCCEEEEEEEEEECCCCEEEEEEEECCCC----------CCHHHH-H T ss_conf 979999999970999999997498-9-88778865578899999987994699999969985----------002378-9 Q ss_pred CEEEECCEEEEEECCCCCC--CHHHHHHH--HHHHH-CCC-C-CCCEEEECCCCCCCHHHHHHHHHHHCCCCCCCCCCCC Q ss_conf 0012012059984553212--20212232--00000-035-7-6655894422335415556665420133320048831 Q gi|255764471|r 280 MQSVRTCETTIVLLDATIP--FEKQDLRI--VDSVF-NTG-H-AVVLALNKWDMVSDKLNLLQDLRTKAIKNLPQIGDIY 352 (470) Q Consensus 280 ~~~i~~advvi~viDa~~~--~~~qd~~i--~~~i~-~~~-k-~~iiv~NK~Dli~~~~~~~~~~~~~~~~~~~~~~~~~ 352 (470) T Consensus 68 ~~y~~~a~~~ilVYDitn~~SF~~l~~W~~~i~~~~~~~~~~~~iiLVGNK~DL~~~R~Vs~ee~-----~~~A~~~g~~ 142 (215) T cd04109 68 DKYIYGAHAVFLVYDVTNSQSFENLEDWYSMVRKVLKSSETQPLVVLVGNKTDLEHNRTVKDDKH-----ARFAQANGME 142 (215) T ss_pred HHHHHHHCCEEEECCCCCHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEECCCHHHHCCCCHHHH-----HHHHHHCCCE T ss_conf 99997515137741478678999899999999998504577852999975454286477699999-----9999982998 Q ss_pred CCCCCCCCCCCHHHHHHHHHHHHHHHHCCCCHHHH Q ss_conf 11234533348589999999999984146897898 Q gi|255764471|r 353 INTISGRTGEGLDDLMVSVLEINKLWKTRITTSYL 387 (470) Q Consensus 353 i~~iSA~~g~gi~~l~~~i~~~~~~~~~ri~T~~L 387 (470) T Consensus 143 f~E~SAktg~nV~e~F~~la~--~i~~~~l~~~~~ 175 (215) T cd04109 143 SCLVSAKTGDRVNLLFQQLAA--ELLGVDLSKAEL 175 (215) T ss_pred EEEEECCCCCCHHHHHHHHHH--HHHCCCCCHHHH T ss_conf 999838999498999999999--997683664565

HHsearch alignment for GI: 255764471 and conserved domain: cd04109