Proteases and chemicals which break specific bonds in peptide sequences: Chymotr

Question

Proteases and chemicals which break specific bonds in peptide sequences: Chymotrypsin, cuts on the C-terminal side of tyrosine, phenylalanine, and tryptophan. Trypsin, cuts on the C-terminal of lysine and arginine. Thermolyzing, cuts on the N-terminal side of leucine, phenylalanine, isoleucine, and valine. Pepsin, cuts on the C-terminal of phenylamine, leucine, and glutamic acid. Cyanogen bromide, cuts on the C-terminal side of methionine. Information about the amino acids in this sequence: 1. The amino acid at the N-terminus is negatively charged with a 3 carbon side chain 2. The 2nd amino acid is the only non-chiral amino acid 3. One amino acid is the only polar neutral amino acid with sulfur in its R group 4. There are 2 positively changed amino acids and 2 negatively charged amino acids 5. A negatively charged amino acid with a two carbon side chain lies adjacent to Cystine 6. Histidine lays in-between Tyrosine and Methionine 7. Lysine lies adjacent to the only polar neutral amino acid with a benzene ring 8. The amino acid at the C-terminus is a polar neutral amino acid with a 1 carbon side chain and an OH group. 9. Methionine is located at position # 7, and is adjacent to a negatively charged amino acid with a two carbon side chain. 10. One amino acid has the molecular formula of C_3 H_7 NO_2 and lies adjacent to glycine 11. A polar neutral amino acid is located next to the C-terms. Experimental Results: A. Digestion with chymotrypsin resulted in 2 pentapeptides with neutral charges. B. Digestion with trypsin resulted in a tetrapeptide with a neutral charge and a neutral hexapeptide. C. Digestion with cyanogen Bromide resulted in a heptapeptide with a positive charge and a tripeptide with a negative charge. D. Digestion with thermolyzing resulted in a decapeptide. E. Digestion with pepsin resulted in a negatively changed peptide and a positively charged nonpeptide.

Explanation / Answer

serine will be correct answer for the (8) the amino acid at the c terminus is polar neutral amino acid with a one carbon side chain and a OH group.

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