Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Consider the peptides Ser-Glu-Gly-His-Ala and Gly-His-Ala-Glu-Ser. How do these two peptides differ?
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- Among these amino acid combinations listed above, only the combination of Lys and Glu have side chains with groups that have the greatest ability to stabilize the tertiary structure of a protein. Explain by drawing (a) why Lys and Glu side chain interaction stabilizes the tertiary structure of a protein (b) why the pairs of Glu and Asp & Arg and Pro cannot provide the stability to the protein structure.arrow_forwardIdentify and encircle the peptide bonds in this polypeptide (Leu-Pyr-Sec-Ile-Ser-Glu)?arrow_forwardConsider the following two peptides: I. Ile-Trp-Ala-Met and II. Glu-His-Cys-Thr Which peptide would be more soluble in water? Answer I or II.arrow_forward
- At what pH does peptide the His-Arg have a net charge of +1.7?arrow_forwardDraw the tetrapeptide Met-Ile-Lys-Glu at a ph of 7?arrow_forwardGiven the peptide Val-Ser-Gln-Lys The lateral chain of one of these amino acids can be modified by N-acetylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7 The lateral chain of one of these amino acids can be modified by phosphorylation. Write the semi‐developed form of the lateral chain of this modified amino acid at pH 7.arrow_forward
- Polylysine adopts a random structure in solution at physiological pH (i.e. 7.4). Given that the e-amino group of lysine has a pKa of 10.5, under what circumstances do you think polylysine will form an a-helix? Give an explanation for your decision. Given the pKa of the side-chain COOH group, under what circumstances would you anticipate polyglutamate to form an a-helix?arrow_forwardyou have the following peptide Arg-Ile-Pro-Leu-Asp-Lys-Glu The net charge on this peptide at pH 7.0 is ?. The net charge on this peptide at 1M HCl is ?.arrow_forwardWhat is the net electric charge of a peptide that has the sequence and provide the one letter code if you can Glu-His-Ser-Gly-Leu-Arg-Pro-Gly at pH 3, and 11arrow_forward
- HOW MANY DIFFERENT PROTEINS CAN BE CONSTRUCTED THAT ARE EXACTLY FOUR AMINO ACIDS LONG? (HINT: THERE ARE 20 POSSIBLE AMINO ACIDS.)arrow_forwardIn the peptide Ser-Cys-Ala-Gly, the N-terminal end is Oglycine. O cystein. O serine. Oalanine.arrow_forwardWhat is the pI, and how is it determined for amino acids that have noninionizable R groups?arrow_forward
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