Biochim Biophys Acta. 1978 Jun 22;519(1):243-54.

Protein methylation in animal cells. I. Purification and properties of S-adenosyl-L-methionine:protein (arginine) N-methyltransferase from Krebs II ascites cells.

Abstract

1. A protein methylase which specifically transfers methyl groups from S-adenosyl-L-methionine to arginine residues of histones has been substantially purified from Krebs II ascites cells. The purified enzyme was obtained free of contamination by other protein methyl transferases specific for carboxyl and lysine residues. This latter activity copurified with the present enzyme until advanced stages of purification. 2. The purified enzyme does not require any divalent cation for maximum activity. It is inhibited by ionic strength, N-ethylmaleimide and S-adenosyl-L-homocysteine. It has an apparent molecular weight on gel filtration of approx. 5 . 10(5). A Km value for S-adenosyl-L-methionine of 2.5 . 10(-6) M was determined, while the dissociation constant Ki for S-adenosyl-L-homocysteine, which acts as a competitor, was 1.4 . 10(-6) M.

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Protein methylation in animal cells. I. Purification and properties of S-adenosyl-L-methionine:protein (arginine) N-methyltransferase from Krebs II ascites cells.

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