• J. Biol. Chem. · Jun 1982

    Primary structure of tyrosinase from Neurospora crassa. I. Purification and amino acid sequence of the cyanogen bromide fragments.

    • K Lerch, C Longoni, and E Jordi.
    • J. Biol. Chem. 1982 Jun 10; 257 (11): 6408-13.

    AbstractCyanogen bromide (CB) cleavage of Neurospora tyrosinase resulted in four major fragments, CB1 (222 residues), CB2 (82 residues), CB3 (68 residues), and CB4 (35 residues), and one minor overlap peptide CB2-4 (117 residues) due to incomplete cleavage of a methionylthreonyl bond. The sum of the amino acid residues of the four major fragments matches the total number of amino acid residues of the native protein. The amino acid sequences of the cyanogen bromide fragments CB2, CB3, and CB4 were determined by a combination of automated and manual sequence analysis on peptides derived by chemical and enzymatic cleavage of the intact and the maleylated derivatives. The peptides were the products of cleavage by mild acid hydrolysis, trypsin, pepsin, chymotrypsin, thermolysin, and Staphylococcus aureus protease V8. The cyanogen bromide fragment CB1 was found to contain two unusual amino acids whose chemical structure will be presented in the following paper.

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