PMID: 7034783Feb 2, 1982Paper

AMP deaminase isozymes in human tissues

Biochimica Et Biophysica Acta
N OgasawaraT Asano

Abstract

In human, there are four AMP deaminase (AMP aminohydrolase, EC 3.5.4.6) isozymes: E1, E2, M and L. Chromatographic, electrophoretic and immunological studies showed the existence of isozymes E1 and E2 in erythrocytes, isozyme M in muscle and isozyme L in liver and brain. The tissues such as heart, kidney and spleen contained isozymes E1, E2 and L. Isozymes E1, M and L were isolated as apparently homogeneous preparations. The three isozymes were all tetramers composed of identical subunits, but differing slightly in molecular weight; isozyme E1 showed a subunit molecular weight of 80,000, isozyme M 72,000 and isozyme L 68,000. They were immunologically different from one another. The antisera precipitated only the corresponding enzyme and did not precipitate any other isozyme. The three isozymes were also different in kinetic and regulatory properties. Isozyme E2 was very similar to isozyme E1 in immunological an kinetic properties, although isozyme E2 could be separated from isozyme E1 by phosphocellulose chromatography, and zonal electrophoresis.

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