>cd03234 ABCG_White The White subfamily represents ABC transporters homologous to the Drosophila white gene, which acts as a dimeric importer for eye pigment precursors. The eye pigmentation of Drosophila is developed from the synthesis and deposition in the cells of red pigments, which are synthesized from guanine, and brown pigments, which are synthesized from tryptophan. The pigment precursors are encoded by the white, brown, and scarlet genes, respectively. Evidence from genetic and biochemical studies suggest that the White and Brown proteins function as heterodimers to import guanine, while the White and Scarlet proteins function to import tryptophan. However, a recent study also suggests that White may be involved in the transport of a metabolite, such as 3-hydroxykynurenine, across intracellular membranes. Mammalian ABC transporters belonging to the White subfamily (ABCG1, ABCG5, and ABCG8) have been shown to be involved in the regulation of lipid-trafficking mechanisms in

Probab=94.35 E-value=0.15 Score=30.99 Aligned_cols=124 Identities=16% Similarity=0.128 Sum_probs=72.4 Q ss_pred HHHHHHHHHHHCCCCEEEEECCCCHHHHHHHHHHHHHHH----HCCCCEEEECC----------------------CCCH Q ss_conf 377777655301683688706874148899999999963----02232364116----------------------7534 Q gi|254781149|r 129 LQSVDHLMGGVQLRELILIGARPSMGKTTFALSTALHMA----MSGHGVAFFSL----------------------EMDR 182 (266) Q Consensus 129 ~~~LD~~~gG~~~g~LiviaaRP~mGKTa~alnia~~~a----~~g~~Vl~fSl----------------------EMs~ 182 (266) T Consensus 20 ~~vL~~vs~~i~~Ge~~~ilGpnGsGKSTLl~~i~G~~~~~~~~~G-~I~~~g~~~~~~~~~~~igyv~Q~~~l~~~lTv 98 (226) T cd03234 20 ARILNDVSLHVESGQVMAILGSSGSGKTTLLDAISGRVEGGGTTSG-QILFNGQPRKPDQFQKCVAYVRQDDILLPGLTV 98 (226) T ss_pred EEEEECCEEEEECCCEEEEECCCCCHHHHHHHHHHCCCCCCCCCEE-EEEECCEECCHHHHHHCEEEECCCCCCCCCCCH T ss_conf 8998897789918809999989996099999999678978984145-999999999878975018999166756789889 Q ss_pred HHHHHHHHHHHHC---------------CCCCCCCHHHCC---CCCCCHHHHHHHHHHHHHHHHCCCEEECCCCCCHH-- Q ss_conf 8999999996302---------------232347855501---78899899999999999997299547479988989-- Q gi|254781149|r 183 EKLGARALSNLLY---------------PSSSRIPYLNLI---RGEINQEQYRISQGICEKLQDFPLIIDDRPSPGIM-- 242 (266) Q Consensus 183 ~ql~~R~ls~~t~---------------~~~s~I~~~~l~---~g~l~~~e~~~i~~a~~~l~~~pl~IdD~~~~ti~-- 242 (266) T Consensus 99 ~e~l~-~~~~~~~~~~~~~~~~~~~~~~~~l~~~~l~~~~~~~~~~LSGGqrqRv~iA~aL~~~P~illLDEPTsgLD~~ 177 (226) T cd03234 99 RETLT-YTAILRLPRKSSDAIRKKRVEDVLLRDLALTRIGGNLVKGISGGERRRVSIAVQLLWDPKVLILDEPTSGLDSF 177 (226) T ss_pred HHHHH-HHHHHCCCCCCCHHHHHHHHHHHHHHHCCCHHHHCCCCCCCCHHHHHHHHHHHHHHCCCCEEEEECCCCCCCHH T ss_conf 99999-99974676436278999999999998758976746773328999999999999996599989995886568999 Q ss_pred ---HHHHHHHHHHHH Q ss_conf ---999999999999 Q gi|254781149|r 243 ---EFVHVANGLRNK 254 (266) Q Consensus 243 ---~ira~aR~~k~k 254 (266) T Consensus 178 ~~~~i~~~l~~l~~~ 192 (226) T cd03234 178 TALNLVSTLSQLARR 192 (226) T ss_pred HHHHHHHHHHHHHHC T ss_conf 999999999999978

HHsearch alignment for GI: 254781149 and conserved domain: cd03234