Unstable variant of NADH methemoglobin reductase in puerto ricans with hereditary methemoglobinemia
AUTOR(ES)
Schwartz, Joel M.
RESUMO
The electrophoretic mobility of erythrocyte NADH methemoglobin reductase in five hereditary methemoglobinemia patients from three Puerto Rican kindreds was 118% of normal at pH 8.6. The methemoglobin ferrocyanide reductase activity of the enzyme in erythrocyte hemolysates was 3.2-6.4% of normal. Electrophoresis of hemolysates prepared from the blood of patients from two different families at six pH values between 4.6 and 9.3 did not differentiate between the variant enzymes. Examination of the deficient enzymes extracted from the erythrocytes of one patient from each kindred revealed altered affinity for NADH and dichloroindophenol dye and decreased thermal stability. The quantitative similarity of the abnormal findings, together with the Puerto Rican origin of the kindreds, suggested that the cyanotic patients possessed the same abnormal enzyme and were thus homozygous for the same rare mutant gene. Consanguinity of the kindreds could not be established.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=292298Documentos Relacionados
- Electrophoretic and functional variants of NADH-methemoglobin reductase in hereditary methemoglobinemia
- Hereditary Male Pseudohermaphroditism Associated with an Unstable Form of 5α-Reductase
- NADH cytochrome b5 reductase activity in lymphoid cell lines. Expression of the defect in epstein Barr virus transformed lymphoblastoid cell lines from patients with recessive congenital methemoglobinemia.
- Alteration of NADH-diaphorase and cytochrome b5 reductase activities of erythrocytes, platelets, and leucocytes in hereditary methaemoglobinaemia with and without mental retardation.
- Membrane-bound cytochrome b5 reductase (methemoglobin reductase) in human erythrocytes. Study in normal and methemoglobinemic subjects.