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  Domain Name: ABCG_White
White pigment protein homolog of ABCG transporter subfamily. 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 macrophages, hepatocytes, and intestinal mucosa cells. ABCG1 (ABC8), the human homolog of the Drosophila white gene is induced in monocyte-derived macrophages during cholesterol influx mediated by acetylated low-density lipoprotein. It is possible that human ABCG1 forms heterodimers with several heterologous partners.
No pairwise interactions are available for this conserved domain.

Total Mutations Found: 136
Total Disease Mutations Found: 75
This domain occurred 42 times on human genes (91 proteins).



  ARTERIAL CALCIFICATION, GENERALIZED, OF INFANCY, 2, INCLUDED
  CHOLESTASIS, INTRAHEPATIC, OF PREGNANCY, 3
  CHOLESTASIS, PROGRESSIVE FAMILIAL INTRAHEPATIC 3
  CONE-ROD DYSTROPHY 3, INCLUDED
  CYSTIC FIBROSIS
  DUBIN-JOHNSON SYNDROME
  FUNDUS FLAVIMACULATUS
  GALLBLADDER DISEASE 1
  GALLBLADDER DISEASE 1, INCLUDED
  HIGH DENSITY LIPOPROTEIN DEFICIENCY
  ICHTHYOSIS, CONGENITAL, AUTOSOMAL RECESSIVE 4A
  ICHTHYOSIS, CONGENITAL, AUTOSOMAL RECESSIVE 4B
  JUNIOR BLOOD GROUP SYSTEM, JR(A-) PHENOTYPE
  JUNIOR BLOOD GROUP SYSTEM, JR(A-) PHENOTYPE, INCLUDED
  LANGEREIS BLOOD GROUP SYSTEM, LAN(-) PHENOTYPE
  MACULAR DEGENERATION, AGE-RELATED, 2, SUSCEPTIBILITY TO
  PSEUDOXANTHOMA ELASTICUM
  RETINAL DYSTROPHY, EARLY-ONSET SEVERE
  STARGARDT DISEASE 1
  STARGARDT DISEASE 1, INCLUDED;;
  SURFACTANT METABOLISM DYSFUNCTION, PULMONARY, 3
  TANGIER DISEASE
  TAP1 DEFICIENCY, SOMATIC
  URIC ACID CONCENTRATION, SERUM, QUANTITATIVE TRAIT LOCUS 1
  VAS DEFERENS, CONGENITAL BILATERAL ABSENCE OF


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Range on the Protein:  

   Protein ID            Protein Position

Domain Position:  


Feature Name:Total Found:
ATP binding site
ABC transporter signature
Walker A/P-loop
Walker B
D-loop
Q-loop/lid
H-loop/switch region
















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Please Cite: Peterson, T.A., Adadey, A., Santana-Cruz ,I., Sun, Y., Winder A, Kann, M.G., (2010) DMDM: Domain Mapping of Disease Mutations. Bioinformatics 26 (19), 2458-2459.

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