>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=99.67 E-value=5.2e-16 Score=123.46 Aligned_cols=151 Identities=26% Similarity=0.310 Sum_probs=99.3 Q ss_pred EEEECCCCCCHHHHHHHHHCCCEEEECCCCCCEEEEE-EEEEEECC--EEEEEEECCCCHHHCCCCCCCCCCHHHHHHHH Q ss_conf 9983389986889999986892021058888602127-89997399--48999987984010123575321002345555 Q gi|254780941|r 25 VALVGATNAGKSTLVNRFVGAKVSIVTHKVQTTRSIV-RGIVSEKE--SQIVFLDTPGIFNAKDSYHKLMIRLSWSTIKH 101 (311) Q Consensus 25 VaivG~pN~GKSTL~N~l~g~~vsivS~k~~TTr~~i-~gi~~~~~--~qiifvDTPG~~~~~~~l~~~~~~~~~~~l~~ 101 (311) T Consensus 3 i~vvG~~~vGKTsli~r~~~~~f~--~~~~~ti~~~~~~k~i~~~~~~~~l~iwDt~G~~--------~~~~~~~~~~~~ 72 (162) T cd04123 3 VVLLGEGRVGKTSLVLRYVENKFN--EKHESTTQASFFQKTVNIGGKRIDLAIWDTAGQE--------RYHALGPIYYRD 72 (162) T ss_pred EEEECCCCCCHHHHHHHHHHCCCC--CCCCCCCEEEEEEEEEEECCEEEEEEEEECCCCC--------CCCCCCHHHEEC T ss_conf 999999996799999999839899--8767752647999999999999999999589973--------035563133011 Q ss_pred HHHHCCCCHHHHHHHCC-HHHHHHHHHH---CCCCCEEEEEECCCHHHHHH-HHHHHHHHHCCCCCCCCCCCCCCCCCHH Q ss_conf 32100110000100000-0012234544---28720257872110104345-7888864100123343110001387426 Q gi|254780941|r 102 ADIVCLVVDSHRELKVN-IHDLLKEIAK---RSSRLILILNKIDCVKPERL-LEQAEIANKLVFIEKTFMVSATKGHGCD 176 (311) Q Consensus 102 aDiil~VvDa~~~~~~~-~~~il~~l~~---~~~p~IiVlNKiDlv~~~~l-~~~~~~~~~~~~~~~i~~ISAk~g~Gid 176 (311) T Consensus 73 a~~~ilv~d~t~~~Sf~~i~~~~~~i~~~~~~~~~iilvgnK~Dl~~~r~v~~~e~~~~a~~~~~-~y~e~Sak~g~nV~ 151 (162) T cd04123 73 ADGAILVYDITDADSFQKVKKWIKELKQMRGNNISLVIVGNKIDLERQRVVSKSEAEEYAKSVGA-KHFETSAKTGKGIE 151 (162) T ss_pred CCEEEEEEECCCHHHHHHHHHHHHHHHHHCCCCCCEEEECCCCCCHHHCCCCHHHHHHHHHHCCC-EEEEEECCCCCCHH T ss_conf 44579996389989999999999999987699974686633213254088899999999998299-89998127881989 Q ss_pred HHHHHHHHHC Q ss_conf 7899999836 Q gi|254780941|r 177 DVLNYLCSTL 186 (311) Q Consensus 177 ~L~~~L~~~l 186 (311) T Consensus 152 e~F~~l~~~i 161 (162) T cd04123 152 ELFLSLAKRM 161 (162) T ss_pred HHHHHHHHHH T ss_conf 9999999986

HHsearch alignment for GI: 254780941 and conserved domain: cd04123