Treatment of a tetrapeptide A with trypsin resulted in the formation of the amino acid Glu, and the tripeptide B containing Arg, Tyr, and Threatment of the original tetrapeptide A with chymotrypsin resulted in the formation of dipeptide B containing Glu and Arg, and dipeptide C containing Tyr and Thr What is the sequence of the original tetrapeptide A, writing from amino terminus to carboxyl terminus? The Sequence of the Original Tetrapeptide A: Glu-Arg-Tyr-Thr

The sequence of the original Tetrapeptide: Glu-Arg–Tyr–Thr
Treatment of the tetrapeptide A with trypsin resulted in the formation of the amino acid Glu, and the tripeptide B containing Arg, Tyr, and Thr (He, Huang, & Li, 2019). Treatment of the original tetrapeptide A with chymotrypsin resulted in the formation of dipeptide B containing Glu and Arg, and dipeptide C containing Tyr and Thr (Jiang, Zhang, & Zhang, 2021). This shows that the sequence for the original tetrapeptide A was Glu-Arg–Tyr–Thr. It is written from the carboxyl terminus to its amino terminus. The hydrolysis of peptide bond by enzymes is responsible for the formation of trypsin, chymotrypsin, and tripeptide A products. Trypsin cleaves peptide bond after basic residues like Arg while chymotrypsin cleaves peptide bond after aromatic residues like Tyr (He et. al. 2019; Jiang et. al., 2021). The original tetrapeptide A is Glu–Arg-Tyr–Thr. Cont…..
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