ID 7.6.2.6 DE ABC-type guanine transporter. AN guanine-transporting ATPase. CA ATP + guanine(out) + H2O = ADP + guanine(in) + H(+) + phosphate. CC -!- An ATP-binding cassette (ABC) type transporter found in insects that CC transports guanine and other purines into pigment granules in the CC eye, where they are converted to pteridine pigments. CC -!- The transporter is a hererodimer composed of two different peptides, CC each containing one membrane-spanning and one cytoplasmic ATP-binding CC domain. CC -!- In Drosophila, this transporter is encoded by the white and brown CC genes. CC -!- Formerly EC 3.6.3.37. DR P12428, BROWN_DROME; Q24739, BROWN_DROVI; P10090, WHITE_DROME; //