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- W35296227 abstract "N alpha-Acetylation is the most frequently occurring chemical modification of the alpha-NH2 group of eukaryotic proteins and was believed until now to be catalyzed by a single N alpha-acetyltransferase. The transfer of an acetyl group from acetyl coenzyme A to the alpha-amino group of five NH2-terminal residues (serine, alanine, methionine, glycine, and threonine) in proteins accounts for approximately 95% of acetylated residues. We have found that a crude lysate from Saccharomyces cerevisiae mutant (aaa1) deficient in N alpha-acetyltransferase activity can effectively transfer an acetyl group to peptides containing NH2-terminal methionine but not to serine or alanine. This methionine N alpha-acetyltransferase has been extensively purified, and this purified enzyme can selectively transfer an acetyl group to various model peptides containing an NH2-terminal methionine residue and a penultimate aspartyl, asparaginyl, or glutamyl residue. Such specificity of N alpha-acetylation of methionine has been previously observed based on the analysis of eukaryotic protein sequences (Persson, B., Flinta, C., Heijne, G., and Jornvall, H. (1985) Eur. J. Biochem. 152, 523-527; Arfin, S.M., and Bradshaw, R. A. (1988) Biochemistry 27, 7979-7984). The indentification of this methionine N alpha-acetyltransferase provides an explanation as to why two distinct classes of N alpha-acetylated proteins exist in nature: (i) those whose initiator methionine is acetylated and (ii) those whose penultimate residue is acetylated after cleavage of the initiator methionine." @default.
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- W35296227 date "1990-03-01" @default.
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- W35296227 title "Identification of methionine Nalpha-acetyltransferase from Saccharomyces cerevisiae." @default.
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- W35296227 doi "https://doi.org/10.1016/s0021-9258(19)39633-4" @default.
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