Concept explainers
Interpretation:
The possible amino acid sequences in the tetrapeptide which on analysis gave alanine, glycine, phenylalanine, and valine in equimolar amounts are to be determined.
Concept Introduction:
A peptide bond is an amide bond. A tetrapeptide contains four amino acids linked by the peptide bonds.
A peptide bond is formed between the amino group of one amino acid and the carboxyl group of the other amino acid.
The peptide structures are written, such that the amino group is at the left side and the carboxyl group is at the right side.
The left end of the peptide is called the N terminus and the right end is called the C terminus.
Each amino acid contains an amino group and a carboxylic acid group attached to the same carbon atom.
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ORGANIC CHEMISTRY-W/STUD.SOLN.MAN.
- On complete hydrolysis, a polypeptide gives two alanine, one leucine, one methionine, one phenylalanine, and one valine residue. Partial hydrolysis gives the following fragments: Ala-Phe, Leu-Met, Val-Ala, Phe-Leu. It is known that the first amino acid in the sequence is valine and the last one is methionine. What is the complete sequence of amino acids?arrow_forwardDo the amino acid sequences: valine-asparagine and asparagine-valine represent the same compound? Explain.arrow_forwardUsing the single letter abbreviations A, V, and L, as given in Table 22-1, list the tripeptides formed if alanine, valine, and leucine are all mixed together and peptide bonds are allowed to form in all possible combinations.arrow_forward
- What special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?arrow_forward22-49 Based on your knowledge of the chemical properties of amino acid side chains, suggest a substitution for leucine in the primary structure of a protein that would probably not change the character of the protein very much.arrow_forwardConsider the tripeptide tyrosylleucylisoleucine. a. Specify its structure using three-letter symbols for the amino acids. b. How many peptide bonds are present within the peptide? c. Which of the amino acid residues has the largest R group? d. Which of the amino acid residues, if any, has an acidic side chain?arrow_forward
- 22-84 How many different dipeptides can be made (a) using only alanine, tryptophan, glutamic acid, and arginine and (b) using all 20 amino acids?arrow_forward22-20 Show how alanine, in solution at its isoelectric point, acts as a buffer (write equations to show why the pH does not change much if we add an acid or a base).arrow_forward
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