>cd04117 Rab15 Rab15 subfamily. Rab15 colocalizes with the transferrin receptor in early endosome compartments, but not with late endosomal markers. It codistributes with Rab4 and Rab5 on early/sorting endosomes, and with Rab11 on pericentriolar recycling endosomes. It is believed to function as an inhibitory GTPase that regulates distinct steps in early endocytic trafficking. 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 are further regulated by guanine nucleotide dissociation inhibitors (GDIs), which facilitate Rab recycling by masking C-terminal lipid binding and promoting cytosolic localization. Most Rab GTPases contain a lipid modification site at the C-terminus, with sequence motifs CC, CXC, or CCX. Lipid binding is essential for membrane attachment, a key feature of most Rab proteins. Due to

Probab=99.43 E-value=6.8e-13 Score=109.24 Aligned_cols=133 Identities=21% Similarity=0.340 Sum_probs=94.6 Q ss_pred CCEEEECCCCCCHHHHHHHHHCCHHCCCCC-CCCCCEEECCCCCCCCCE--EEEEEECCHHCCCCHHHHHHHHHHHHHHH Q ss_conf 302431146631888999985520002345-468721100012456835--89995081000241035666678889985 Q gi|254780809|r 220 YKIVILGHSNAGKSSLFNALAKKDVAIVTD-IPGTTRDVLTIDLDLEGY--LVKISDTAGIRETDDIVEKEGIKRTFLEV 296 (440) Q Consensus 220 ~~v~i~G~pN~GKSSL~N~L~~~~~aIVs~-~~GTTRD~i~~~~~i~g~--~~~l~DTaGir~t~d~IE~~GI~ra~~~i 296 (440) T Consensus 1 ~KIvllGd~~VGKTsli~r~~~~~f--~~~~~~Tig~~~~~k~v~~~~~~i~l~iwDtaGqe~~~~--------~~~~y~ 70 (161) T cd04117 1 FRLLLIGDSGVGKTCLLCRFTDNEF--HSSHISTIGVDFKMKTIEVDGIKVRIQIWDTAGQERYQT--------ITKQYY 70 (161) T ss_pred CEEEEECCCCCCHHHHHHHHHCCCC--CCCCCCCCEEEEEEEEEEECCEEEEEEEEECCCCCCCCC--------CHHHHH T ss_conf 9899999499858999999942998--998788720898899999999999999997999602363--------558887 Q ss_pred HHHCCEEECCCCCCHHHHHH------------HCCCCCCCCCCCCCCCCCCCHH-------------HHHHHHHHHHHHH Q ss_conf 03011020135898566343------------1289853222233344654200-------------0001333323235 Q gi|254780809|r 297 ENADLILLLKEINSKKEISF------------PKNIDFIFIGTKSDLYSTYTEE-------------YDHLISSFTGEGL 351 (440) Q Consensus 297 ~~aDlil~v~D~~~~~~~~~------------~~~~~~i~V~NK~Dl~~~~~~~-------------~~~~ISaktg~Gi 351 (440) T Consensus 71 r~a~~~ilvyDvt~~~Sf~~l~~w~~~i~~~~~~~~~~ilVgNK~Dl~~~r~v~~~~~~~~a~~~~~~~~etSAk~~~nV 150 (161) T cd04117 71 RRAQGIFLVYDISSERSYQHIMKWVSDVDEYAPEGVQKILIGNKADEEQKRQVGDEQGNKLAKEYGMDFFETSACTNSNI 150 (161) T ss_pred HHHCEEEEECCCCCHHHHHHHHHHHHHHHHHCCCCCEEEEEEECCCHHHCCCCCHHHHHHHHHHCCCEEEEECCCCCCCH T ss_conf 64168899614898899999999999999878998649998732787862779999999999986997999677898298 Q ss_pred HHHHHHHHHHH Q ss_conf 89999999996 Q gi|254780809|r 352 EELINKIKSIL 362 (440) Q Consensus 352 ~~L~~~I~~~l 362 (440) T Consensus 151 ~e~F~~l~~~i 161 (161) T cd04117 151 KESFTRLTELV 161 (161) T ss_pred HHHHHHHHHHC T ss_conf 99999999649

HHsearch alignment for GI: 254780809 and conserved domain: cd04117