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The amino acid sequence of ribonuclease N1, a guanine-specific ribonuclease from the fungus Neurospora crassa.

The complete amino acid sequence of ribonuclease N1 (RNase N1), a guanine-specific ribonuclease from a fungus, Neurospora crassa, was determined by conventional protein sequencing, using peptide fragments obtained by tryptic digestion of cyanogen bromide-treated RNase N1 and by Staphylococcus aureus V8 protease digestion of heat-denatured RNase N1. The results showed that the protein is composed of a single polypeptide chain of 104 amino acid residues cross-linked by two disulfide bonds and has a molecular weight of 11,174: (sequence; see text) (Disulfide bonds: C2-C10, C6-C103) The amino acid sequence was homologous with those of RNase T1 (65% identity) and related microbial RNases.