>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=96.26 E-value=0.033 Score=35.77 Aligned_cols=139 Identities=19% Similarity=0.327 Sum_probs=72.8 Q ss_pred EEECCCCCCCCHHHHHHHHHHHHHHCCCCEEEEECCCCCHHHHHHHHHHHHHHCCCCCCCCCCCCCHHHHHHHHHHHHHH Q ss_conf 23113544444247899999998522674267743451245688999997530353212235866124542289999651 Q gi|254780709|r 113 VILVVGVNGVGKTTVIGKLSKKMSDAGLKVMLAAGDTFRSAAIDQLKIWADRTSADFVCSEIGSDAAALAYEAFKQAQAK 192 (321) Q Consensus 113 vil~vG~nG~GKTTT~aKLA~~~~~~g~kV~lva~DtfR~aA~eQL~~~a~~~~v~~~~~~~~~dp~~v~~~a~~~a~~~ 192 (321) T Consensus 2 Ki~vvG~~~vGKTsli~r~~~~~f~~~~~---------------------~ti~~~~~~k~i-------~~------~~~ 47 (162) T cd04123 2 KVVLLGEGRVGKTSLVLRYVENKFNEKHE---------------------STTQASFFQKTV-------NI------GGK 47 (162) T ss_pred EEEEECCCCCCHHHHHHHHHHCCCCCCCC---------------------CCCEEEEEEEEE-------EE------CCE T ss_conf 89999999967999999998398998767---------------------752647999999-------99------999 Q ss_pred CCCEEEEECCCCCCCHHHHHHHHHHHHHHHHCCCCCCCCEEEEECCCCCCHHHHHHHHHH----HHHCC--CC-EEEEEC Q ss_conf 487599865433321157789999899876302223430112310233522577899987----64358--97-699965 Q gi|254780709|r 193 KVDVLIIDTAGRLHNNSILMAGIGKMIRVLKRLDPHAPHSVLQVLDATTGQNALRQVEMF----HAVAG--TT-GLIMTK 265 (321) Q Consensus 193 ~~DvvliDTAGR~~~~~~lm~EL~ki~~v~~~~~~~~p~~~~lVlda~~gq~~~~~a~~F----~~~~~--~~-g~I~TK 265 (321) T Consensus 48 ~~~l~iwDt~G~~~~~~-----~~~~------~-~~~a~~~ilv~d~t~-~~Sf~~i~~~~~~i~~~~~~~~~iilvgnK 114 (162) T cd04123 48 RIDLAIWDTAGQERYHA-----LGPI------Y-YRDADGAILVYDITD-ADSFQKVKKWIKELKQMRGNNISLVIVGNK 114 (162) T ss_pred EEEEEEEECCCCCCCCC-----CCHH------H-EECCCEEEEEEECCC-HHHHHHHHHHHHHHHHHCCCCCCEEEECCC T ss_conf 99999995899730355-----6313------3-011445799963899-899999999999999876999746866332 Q ss_pred CCCCC----CHHHHHHHHHHHCCCEEEEE--CCCCCCCC Q ss_conf 45787----06999999999769889997--58981325 Q gi|254780709|r 266 MDGTA----RGGGLIPIVVTHKIPVYFLG--VGEGINDL 298 (321) Q Consensus 266 lD~ta----~~G~~ls~~~~~~~Pi~fig--~Ge~i~Dl 298 (321) T Consensus 115 ~Dl~~~r~v~~~e~~~~a~~~~~~y~e~Sak~g~nV~e~ 153 (162) T cd04123 115 IDLERQRVVSKSEAEEYAKSVGAKHFETSAKTGKGIEEL 153 (162) T ss_pred CCCHHHCCCCHHHHHHHHHHCCCEEEEEECCCCCCHHHH T ss_conf 132540888999999999982998999812788198999

HHsearch alignment for GI: 254780709 and conserved domain: cd04123