>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=94.34 E-value=0.12 Score=30.54 Aligned_cols=83 Identities=12% Similarity=0.191 Sum_probs=43.0 Q ss_pred EEEECCCCCCHHHHHHHHHHHHCCCCCCCCCCCH----HHHHHHCCCCCCEEEEEEECCCCHHHHHCCCHHHHCC--CCE Q ss_conf 9998787868899999999760788853024520----2011003788608999865178977753058367508--978 Q gi|254780824|r 36 LTLSGDLGSGKSFLARSIIRFLMHDDALEVLSPT----FTLVQLYDASIPVAHFDFYRLSSHQEVVELGFDEILN--ERI 109 (162) Q Consensus 36 i~L~GdLGaGKTtfvr~i~~~lg~~~~~~V~SPT----F~l~~~Y~~~~~i~H~DlYRL~~~~E~~~lg~~e~~~--~~i 109 (162) T Consensus 3 i~vvG~~~vGKTsli~r~~~~~f~~~----~~~ti~~~~~~-k~i~~~~~~~~l~iwDt~G~~~~~~~~-~~~~~~a~~~ 76 (162) T cd04123 3 VVLLGEGRVGKTSLVLRYVENKFNEK----HESTTQASFFQ-KTVNIGGKRIDLAIWDTAGQERYHALG-PIYYRDADGA 76 (162) T ss_pred EEEECCCCCCHHHHHHHHHHCCCCCC----CCCCCEEEEEE-EEEEECCEEEEEEEEECCCCCCCCCCC-HHHEECCCEE T ss_conf 99999999679999999983989987----67752647999-999999999999999589973035563-1330114457 Q ss_pred EEE-------------ECHHHHHCCCCC Q ss_conf 999-------------985563204995 Q gi|254780824|r 110 CII-------------EWPEIGRSLLPK 124 (162) Q Consensus 110 ~lI-------------EWpe~~~~~lp~ 124 (162) T Consensus 77 ilv~d~t~~~Sf~~i~~~~~~i~~~~~~ 104 (162) T cd04123 77 ILVYDITDADSFQKVKKWIKELKQMRGN 104 (162) T ss_pred EEEEECCCHHHHHHHHHHHHHHHHHCCC T ss_conf 9996389989999999999999987699

HHsearch alignment for GI: 254780824 and conserved domain: cd04123