Summary
Hexosaminidase isoenzymes P from serum of pregnant women and I2 from serum of leukemic children were compared using various biochemical methods, namely, ion exchange chromatography, isoelectric focusing, and molecular weight determination by gel filtration. Isoenzyme I2 is activated by calcium, magnesium, and manganese. The molecular weight of isoenzyme I2 was 110 000 compared to 130 000 of isoenzyme P. The widely differing molecular weights exclude the so far suggested identity of both enzymes. Both isoenzyme P and isoenzyme I2 possessβ-chains, however, they differ in chain structure and glycosylation. This different structure of isoenzyme P may be one of the reasons for its increase during pregnancy due to the resulting impaired clearance by liver sinusoidal cells.
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Abbreviations
- c-ALL:
-
Akute-Lymphatische-Leukämie mit Common-ALL-Antigen
- DEAE:
-
Diethylaminoethyl
- IEF:
-
Isoelektrische Fokusierung
- pI:
-
Isoelektrischer Punkt
Literatur
Ellis RB, Rapson NT, Patrick AD, Greaves MF, Path MRC (1978) Expression of hexosaminidase isoenzymes in childhood leukemia. New Eng J Med 298:476–480
Enslein J, Herzog K-H, Kristl U, Beck JD (1985) Aktivität der Hexosaminidase in Zellinien, Serum und Urin von Leukämiepatienten im Kindesalter. Monatsschr Kinderheilkd 133:219–224
Stirling JL (1971) Separation and characterisation of N-acetyl-beta-glucosaminidases A and P from maternal serum. Biochem J 123:11P
Gel filtration in Theory and Practice: Pharmacia Fine Chemicals AB, Uppsala, Sweden
Price RG, Dance N (1972) The demonstration of multiple heat stable forms of N-acetyl-beta-glucosaminidase in normal serum. Biochem Biophys Acta 271:145–153
Beutler E, Kuhl W (1975) Subunit structure of human hexosaminidase verified: interconvertibility of hexosaminidase isozymes. Nature 258:262–264
Geiger B, Arnon R (1976) Chemical characterization and subunit structure of human N-acetylhexosaminidase A and B. Biochemistry 15:3484–3493
Hasilik A, Neufeld EF (1980) Biosynthesis of lysosomal enzymes in fibroblasts. J Biol Chem 255:4937–4945
Mahuran D, Lowden JA (1980) The subunit and polypeptide structure of hexosaminidases from human placenta. Can J Biochem 58:287–294
Beutler E (1979) The biochemical genetics of the hexosaminidase system in man. Am J Hum Genet 31:95–105
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Enslein, J., Bickel, M., Herzog, K.H. et al. Vergleichende Untersuchungen der Hexosaminidase P im Serum schwangerer Frauen und der Hexosaminidase I2 aus dem Serum leukämiekranker Kinder. Klin Wochenschr 65, 373–375 (1987). https://doi.org/10.1007/BF01745576
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DOI: https://doi.org/10.1007/BF01745576