>cd04123 Rab21 Rab21 subfamily. The localization and function of Rab21 are not clearly defined, with conflicting data reported. Rab21 has been reported to localize in the ER in human intestinal epithelial cells, with partial colocalization with alpha-glucosidase, a late endosomal/lysosomal marker. More recently, Rab21 was shown to colocalize with and affect the morphology of early endosomes. In Dictyostelium, GTP-bound Rab21, together with two novel LIM domain proteins, LimF and ChLim, has been shown to regulate phagocytosis. 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

Probab=99.43 E-value=5.4e-13 Score=109.95 Aligned_cols=133 Identities=25% Similarity=0.337 Sum_probs=94.2 Q ss_pred CCEEEECCCCCCHHHHHHHHHCCHHCCCCCCCCCCEE-ECCCCCCCCCE--EEEEEECCHHCCCCHHHHHHHHHHHHHHH Q ss_conf 3024311466318889999855200023454687211-00012456835--89995081000241035666678889985 Q gi|254780809|r 220 YKIVILGHSNAGKSSLFNALAKKDVAIVTDIPGTTRD-VLTIDLDLEGY--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 ~Ki~vvG~~~vGKTsli~r~~~~~--f~~~~~~ti~~~~~~k~i~~~~~~~~l~iwDt~G~~~~~----~----~~~~~~ 70 (162) T cd04123 1 FKVVLLGEGRVGKTSLVLRYVENK--FNEKHESTTQASFFQKTVNIGGKRIDLAIWDTAGQERYH----A----LGPIYY 70 (162) T ss_pred CEEEEECCCCCCHHHHHHHHHHCC--CCCCCCCCCEEEEEEEEEEECCEEEEEEEEECCCCCCCC----C----CCHHHE T ss_conf 989999999967999999998398--998767752647999999999999999999589973035----5----631330 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 ~~a~~~ilv~d~t~~~Sf~~i~~~~~~i~~~~~~~~~iilvgnK~Dl~~~r~v~~~e~~~~a~~~~~~y~e~Sak~g~nV 150 (162) T cd04123 71 RDADGAILVYDITDADSFQKVKKWIKELKQMRGNNISLVIVGNKIDLERQRVVSKSEAEEYAKSVGAKHFETSAKTGKGI 150 (162) T ss_pred ECCCEEEEEEECCCHHHHHHHHHHHHHHHHHCCCCCCEEEECCCCCCHHHCCCCHHHHHHHHHHCCCEEEEEECCCCCCH T ss_conf 11445799963899899999999999999876999746866332132540888999999999982998999812788198 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 (162) T cd04123 151 EELFLSLAKRM 161 (162) T ss_pred HHHHHHHHHHH T ss_conf 99999999986

HHsearch alignment for GI: 254780809 and conserved domain: cd04123