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. 1986 Jun;83(12):4157–4161. doi: 10.1073/pnas.83.12.4157

Human glucose-6-phosphate dehydrogenase: primary structure and cDNA cloning.

T Takizawa, I Y Huang, T Ikuta, A Yoshida
PMCID: PMC323690  PMID: 3012556

Abstract

The X-chromosome-linked glucose-6-phosphate dehydrogenase (D-glucose-6-phosphate:NADP+ oxidoreductase, EC 1.1.1.49) of humans and other mammals consists of a subunit with a molecular weight of about 58,000. The enzyme plays a key role in the generation of NADPH, particularly in matured erythrocytes, and the genetic deficiency of the enzyme is associated with chronic and drug- or food-induced hemolytic anemia in humans. The enzyme was purified to homogeneity from human erythrocytes. The complete amino acid sequence of the subunit, consisting of 531 amino acid residues, was determined by automated and manual Edman degradation of tryptic, chymotryptic, thermolytic, and cyanogen bromide peptides obtained from the enzyme. Based on the amino acid sequence data thus obtained, a 41-mer oligonucleotide with unique sequence was prepared. Two cDNA libraries constructed in phage lambda gt11--i.e., a human liver cDNA library and a human hepatoma Li-7 cDNA library--were screened with the synthetic nucleotide probe. Two positive clones, lambda G6PD-19 and lambda G6PD-25, were obtained from the hepatoma library. lambda G6PD-19 contained an insertion of 2.0 kilobase pairs (kbp), and encoded 204 amino acid residues that were completely compatible with the COOH-terminal portion of the enzyme. The insertion of the clone had a 3' noncoding region of 1.36 kbp. The other clone, lambda G6PD-25, had an insertion of 1.8 kbp and encoded 362 amino acid residues of G6PD. Southern blot analysis of DNA samples obtained from cells with and without the human X chromosome indicated that the cDNA hybridizes with a sequence in the X chromosome.

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Selected References

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