Determination of the Complete Amino Acid Sequence of Recombinant Human γ-Interferon Produced inEscherichia coli

Abstract
The complete amino acid sequence of recombinant human γ-interferon (HuIFN-γ) produced in Escherichia coli was determined using a gas-phase protein sequencer. The sequence was established by automated Edman degradation on the intact protein and its peptides obtained after Staphylococcus aureus V8 protease or trypsin digestion. The result was identical to the amino acid sequence predicted from the nucleotide sequence of the cloned HuIFN-γ cDNA except that it was missing the four carboxy-terminal residues, Arg-Ala-Ser-Gln.