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NH₂-Terminal Residues of Neurospora crassa Proteins

The Genetics Group, Department of Biological Science, The Florida State University, Tallahassee, Florida 32306

ABSTRACT

The NH₂-terminal amino acid composition of the soluble and ribosomal proteins from Neurospora crassa mycelia and conidia was determined by the dinitrophenyl method. A nonrandom distribution of NH₂-terminal amino acids was observed in the complex protein mixtures. Glycine, alanine, and serine accounted for 75% of the NH₂-terminal amino acids, and glycine appeared most frequently in mature proteins of mycelia. The appearance of phenylalanine as one of the major NH₂-termini in crude conidial fraction suggests that the composition of proteins may vary in different developmental stages.