>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=99.35 E-value=5.2e-12 Score=103.13 Aligned_cols=135 Identities=23% Similarity=0.316 Sum_probs=93.4 Q ss_pred CCEEEECCCCCCHHHHHHHHHCCHHCCCCCCCCCC-EEECCCCCCCCC---EEEEEEECCHHCCCCHHHHHHHHHHHHHH Q ss_conf 30243114663188899998552000234546872-110001245683---58999508100024103566667888998 Q gi|254780809|r 220 YKIVILGHSNAGKSSLFNALAKKDVAIVTDIPGTT-RDVLTIDLDLEG---YLVKISDTAGIRETDDIVEKEGIKRTFLE 295 (440) Q Consensus 220 ~~v~i~G~pN~GKSSL~N~L~~~~~aIVs~~~GTT-RD~i~~~~~i~g---~~~~l~DTaGir~t~d~IE~~GI~ra~~~ 295 (440) T Consensus 1 ~KvvllGd~~VGKTSli~rf~~~~--F~~~y~~TiG~d~~~k~i~i~~~~~v~l~iwDtaGqe~~~--------~~~~~y 70 (215) T cd04109 1 FKIVVLGDGAVGKTSLCRRFAKEG--FGKSYKQTIGLDFFSKRVTLPGNLNVTLQVWDIGGQSIGG--------KMLDKY 70 (215) T ss_pred CEEEEECCCCCCHHHHHHHHHHCC--CCCCCCCCCCEEEEEEEEEECCCCEEEEEEEECCCCCCHH--------HHHHHH T ss_conf 979999999970999999997498--9887788655788999999879946999999699850023--------789999 Q ss_pred HHHHCCEEECCCCCCHHHHHH-------H--------CCCCCCCCCCCCCCCCCCCHH-------------HHHHHHHHH Q ss_conf 503011020135898566343-------1--------289853222233344654200-------------000133332 Q gi|254780809|r 296 VENADLILLLKEINSKKEISF-------P--------KNIDFIFIGTKSDLYSTYTEE-------------YDHLISSFT 347 (440) Q Consensus 296 i~~aDlil~v~D~~~~~~~~~-------~--------~~~~~i~V~NK~Dl~~~~~~~-------------~~~~ISakt 347 (440) T Consensus 71 ~~~a~~~ilVYDitn~~SF~~l~~W~~~i~~~~~~~~~~~~iiLVGNK~DL~~~R~Vs~ee~~~~A~~~g~~f~E~SAkt 150 (215) T cd04109 71 IYGAHAVFLVYDVTNSQSFENLEDWYSMVRKVLKSSETQPLVVLVGNKTDLEHNRTVKDDKHARFAQANGMESCLVSAKT 150 (215) T ss_pred HHHHCCEEEECCCCCHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEECCCHHHHCCCCHHHHHHHHHHCCCEEEEEECCC T ss_conf 97515137741478678999899999999998504577852999975454286477699999999998299899983899 Q ss_pred HHHHHHHHHHHHHHHHH Q ss_conf 32358999999999632 Q gi|254780809|r 348 GEGLEELINKIKSILSN 364 (440) Q Consensus 348 g~Gi~~L~~~I~~~l~~ 364 (440) T Consensus 151 g~nV~e~F~~la~~i~~ 167 (215) T cd04109 151 GDRVNLLFQQLAAELLG 167 (215) T ss_pred CCCHHHHHHHHHHHHHC T ss_conf 94989999999999976

HHsearch alignment for GI: 254780809 and conserved domain: cd04109