>cd01863 Rab18 Rab18 subfamily. Mammalian Rab18 is implicated in endocytic transport and is expressed most highly in polarized epithelial cells. However, trypanosomal Rab, TbRAB18, is upregulated in the BSF (Blood Stream Form) stage and localized predominantly to elements of the Golgi complex. In human and mouse cells, Rab18 has been identified in lipid droplets, organelles that store neutral lipids. 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 mos

Probab=95.87 E-value=0.041 Score=35.11 Aligned_cols=139 Identities=22% Similarity=0.330 Sum_probs=73.9 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 KivvvG~~~vGKTsli~r~~~~~f~~~~~~---------------------ti~~~~~~~~-------~~~------~~~ 47 (161) T cd01863 2 KILLIGDSGVGKSSLLLRFTDDTFDPDLAA---------------------TIGVDFKVKT-------LTV------DGK 47 (161) T ss_pred EEEEECCCCCCHHHHHHHHHHCCCCCCCCC---------------------CCCCCCEEEE-------EEE------CCE T ss_conf 899999799579999999963999998487---------------------3133423899-------999------999 Q ss_pred CCCEEEEECCCCCCCHHHHHHHHHHHHHHHHCCCCCCCCEEEEECCCCCCHHHHHHHHHHHHHC-------CCC-EEEEE Q ss_conf 4875998654333211577899998998763022234301123102335225778999876435-------897-69996 Q gi|254780709|r 193 KVDVLIIDTAGRLHNNSILMAGIGKMIRVLKRLDPHAPHSVLQVLDATTGQNALRQVEMFHAVA-------GTT-GLIMT 264 (321) Q Consensus 193 ~~DvvliDTAGR~~~~~~lm~EL~ki~~v~~~~~~~~p~~~~lVlda~~gq~~~~~a~~F~~~~-------~~~-g~I~T 264 (321) T Consensus 48 ~~~l~iwDt~g~~~~~~~~~~~~------------~~a~~~ilvfd~~~~-~Sf~~i~~~~~~i~~~~~~~~~~~ilVgn 114 (161) T cd01863 48 KVKLAIWDTAGQERFRTLTSSYY------------RGAQGVILVYDVTRR-DTFTNLETWLNELETYSTNNDIVKMLVGN 114 (161) T ss_pred EEEEEEEECCCCCCCCCCHHHHH------------HHCCEEEEEEECCCH-HHHHHHHHHHHHHHHHCCCCCCEEEEEEE T ss_conf 99999999999842353422441------------321534899767826-56999999999999856888873788731 Q ss_pred CCCCCCC---HHHHHHHHHHHCCCEEEEEC--CCCCCCC Q ss_conf 5457870---69999999997698899975--8981325 Q gi|254780709|r 265 KMDGTAR---GGGLIPIVVTHKIPVYFLGV--GEGINDL 298 (321) Q Consensus 265 KlD~ta~---~G~~ls~~~~~~~Pi~fig~--Ge~i~Dl 298 (321) T Consensus 115 K~D~~~~~v~~~~~~~~a~~~~~~y~e~Sak~g~nV~~~ 153 (161) T cd01863 115 KIDKENREVTREEGLKFARKHNMLFIETSAKTRDGVQQA 153 (161) T ss_pred CCCCCCCCCCHHHHHHHHHHCCCEEEEECCCCCCCHHHH T ss_conf 044000689999999999986999999715868159999

HHsearch alignment for GI: 254780709 and conserved domain: cd01863