Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
8th Edition
ISBN: 9780134015187
Author: John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. Peterson
Publisher: PEARSON
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Chapter 18, Problem 18.99CP
Interpretation Introduction
Interpretation:
Diagram of oxytocin showing the disulfide bridge has to be drawn.
Concept introduction:
- Disulfide bridges are covalent
- Oxytocin is a hormone that has a role in the female reproductive system, causing contraction of muscles during labor and on mammary glands tissues to encourage milk release.
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The melanocyte-stimulating hormone a-melanotropin has the following sequence:
Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val
In the one-letter code of amino acids, this sequence would be:
SYSMEHFRWGKPV
STSMGHFAWGKPV
O SYSMDHFAWGKPV
O SYSMEHFAWGLPV
The endorphins are a group of naturally occurring neurotransmitters that act in a manner like morphine to control pain. Research has shown that the biologically active parts of the endorphin molecules are simple pentapeptides called enkephalins. Draw the structure of the methionine enkephalin with the sequence Tyr-Gly-Gly-Phe-Met. Identify the N-terminal and C-terminal amino acids.
Bradykinin is a nonapeptide that stimulates smooth muscle contraction, dilates blood vessels, causes pain, and is a component of bee venom. Give the IUPAC name of the nonapeptide.
Note: The selected photo is the sequence of Bradykinin.
Write the following oligopeptide using the one letter code for the amino acids:
Cys-His-lle-Leu-Glu
N.B. Use upper case characters only, please
Chapter 18 Solutions
Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
Ch. 18.2 - Prob. 18.1PCh. 18.2 - Prob. 18.2PCh. 18.3 - Prob. 18.3PCh. 18.3 - Examine the ball-and-stick model of valine in the...Ch. 18.3 - Indicate whether each of the following molecules...Ch. 18.3 - Prob. 18.6PCh. 18.3 - Prob. 18.7KCPCh. 18.3 - Prob. 18.8PCh. 18.3 - Prob. 18.9PCh. 18.3 - Prob. 18.10P
Ch. 18.3 - Prob. 18.11PCh. 18.3 - Prob. 18.12PCh. 18.4 - The proteins collagen, bovine insulin, and human...Ch. 18.4 - Prob. 18.2CIAPCh. 18.4 - Prob. 18.13PCh. 18.4 - Prob. 18.14PCh. 18.5 - Valine is an amino acid with a nonpolar side...Ch. 18.5 - Tripeptides are composed of three amino acids...Ch. 18.5 - Prob. 18.17PCh. 18.5 - Identify the amino acids in the following...Ch. 18.5 - Prob. 18.19PCh. 18.5 - Prob. 18.3CIAPCh. 18.5 - Prob. 18.4CIAPCh. 18.5 - Two of the most complete (balanced) proteins...Ch. 18.6 - Prob. 18.6CIAPCh. 18.6 - Prob. 18.7CIAPCh. 18.6 - (a)What atoms are present in a planar unit in a...Ch. 18.6 - Prob. 18.21PCh. 18.6 - Prob. 18.22PCh. 18.7 - Prob. 18.23PCh. 18.7 - Prob. 18.24PCh. 18.7 - Complete the following two sentences with either...Ch. 18.7 - Prob. 18.26KCPCh. 18.8 - Which of the following pairs of amino acids can...Ch. 18.8 - Look at Table 18.3 and identify the type of...Ch. 18.8 - In Figure 18.3, identify the amino acids that have...Ch. 18.8 - Prob. 18.30PCh. 18.9 - Prob. 18.31PCh. 18.10 - Another endoprotease is trypsin. Trypsin...Ch. 18.10 - Prob. 18.33PCh. 18.10 - Prob. 18.8CIAPCh. 18.10 - Prob. 18.9CIAPCh. 18 - Draw the structure of the following amino acids,...Ch. 18 - Prob. 18.35UKCCh. 18 - Prob. 18.36UKCCh. 18 - Prob. 18.37UKCCh. 18 - Prob. 18.38UKCCh. 18 - Threonine has two chiral centers. Draw L-threonine...Ch. 18 - Name four biological functions of proteins in the...Ch. 18 - Prob. 18.41APCh. 18 - Prob. 18.42APCh. 18 - Prob. 18.43APCh. 18 - Prob. 18.44APCh. 18 - Prob. 18.45APCh. 18 - Prob. 18.46APCh. 18 - Prob. 18.47APCh. 18 - Draw leucine and identify any chiral carbon atoms...Ch. 18 - Prob. 18.49APCh. 18 - Prob. 18.50APCh. 18 - Is histidine hydrophilic or hydrophobic? Explain...Ch. 18 - Prob. 18.52APCh. 18 - At neutral pH, which of the following amino acids...Ch. 18 - Prob. 18.54APCh. 18 - Prob. 18.55APCh. 18 - Prob. 18.56APCh. 18 - Prob. 18.57APCh. 18 - Proteins are usually least soluble in water at...Ch. 18 - Prob. 18.59APCh. 18 - Prob. 18.60APCh. 18 - Prob. 18.61APCh. 18 - Prob. 18.62APCh. 18 - Prob. 18.63APCh. 18 - (a)Identify the amino acids present in the peptide...Ch. 18 - Prob. 18.65APCh. 18 - Prob. 18.66APCh. 18 - Prob. 18.67APCh. 18 - Prob. 18.68APCh. 18 - Prob. 18.69APCh. 18 - Prob. 18.70APCh. 18 - Prob. 18.71APCh. 18 - Prob. 18.72APCh. 18 - Prob. 18.73APCh. 18 - Prob. 18.74APCh. 18 - Prob. 18.75APCh. 18 - What kind of bond would you expect between chains...Ch. 18 - Is the bond formed between each pair in Problem...Ch. 18 - Prob. 18.78APCh. 18 - Prob. 18.79APCh. 18 - Prob. 18.80APCh. 18 - Prob. 18.81APCh. 18 - Prob. 18.82APCh. 18 - Prob. 18.83APCh. 18 - Prob. 18.84APCh. 18 - Prob. 18.85APCh. 18 - Prob. 18.86APCh. 18 - Prob. 18.87APCh. 18 - Prob. 18.88APCh. 18 - Give an example of a protein that has quaternary...Ch. 18 - Prob. 18.90APCh. 18 - Prob. 18.91APCh. 18 - Prob. 18.92APCh. 18 - Prob. 18.93APCh. 18 - Prob. 18.94APCh. 18 - Prob. 18.95APCh. 18 - Prob. 18.96APCh. 18 - Prob. 18.97APCh. 18 - Prob. 18.98CPCh. 18 - Prob. 18.99CPCh. 18 - Prob. 18.100CPCh. 18 - Prob. 18.101CPCh. 18 - Prob. 18.102CPCh. 18 - Prob. 18.103CPCh. 18 - Prob. 18.104CPCh. 18 - Prob. 18.105CPCh. 18 - Prob. 18.106CPCh. 18 - Prob. 18.107CPCh. 18 - Prob. 18.108CPCh. 18 - Prob. 18.109GPCh. 18 - Prob. 18.110GPCh. 18 - Prob. 18.111GPCh. 18 - Prob. 18.112GP
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- The melanocyte-stimulating peptide hormone a-melanotropin has the following sequence: Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val (a) Write the sequence using the one-letter abbreviations. (b) Calculate the molecular weight of a-melanotropin, a da'arrow_forwardThe bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diff usion of Na+ and K+ ions, thereby killing the cell. This peptide consists of a sequence of Dand L-amino acids. The sequence of a segment of fi ve amino acids in gramicidin A is R-Gly-L-Ala-D-Leu-L-Ala-D-Val-R′. Complete the Fischer projection below by adding the correct group to each vertical bond.arrow_forwardConstruct the primary structure of the following oligopeptides, preferably in their zigzag formulas.arrow_forward
- Peptide A: V-E-S-A-L-D-I-F-R-T-A-L-S Peptide B: S-E-P-P-T-E-G-P Peptide C: T-L-S-A-R-I-D-V Suppose that peptides A, B and C are peptides in a globular protein. Give a possible structural motif or supersecondary structure that can be formed by repeating units of the given three peptides.arrow_forwardDraw the complete structure of the tetrapeptide Val-Cys-Glu-Ser.arrow_forwardThe peptide cys-leu-glu-ala-cys-lys is at pH 7 in oxidizing conditions. Part a) Draw the peptide's titration curve. Part b) What would the pI of the peptide be around?arrow_forward
- An oligopeptide has the following amino acid sequence: NH2-Ala-Glu–Leu–Trp–Tyr-Ser–Gly–Lys–Leu-Ala–Arg-Ala-Phe-Ile-Pro–Gly-COOH a) Estimate the net electric charge of the molecule at pH 8.0 and pH 11.0. b) If the above peptide is passed through a cation exchange chromatographic column (that is, the matrix of the column has negative charges) stabilized at pH 8.0, would you expect it to be retained on the column? c) Indicates the number of fragments, and the sequence of each of them, that would be obtained when treating the peptide in question with: i) trypsin, ii) chymotrypsin.arrow_forwardHeparin, a highly negatively charged glycosaminoglycan, is used clinically as an anticoagulant. It acts by binding several plasma proteins, including antithrombin III, an inhibitor of blood clotting. The 1:1 binding of heparin to antithrombin III seems to cause a conformational change in the protein thatgreatly increases its ability to inhibit clotting. What amino acid residues of antithrombin III are likely to interact with heparin?arrow_forwardIdentify the following amino acid at pH = 7 (aqueous form): (COO-)–CH(NH3+)–CH2–(COO-) aspartic acid asparagine histidine arginine lysinearrow_forward
- There are a total of six different amino acid sequences for a tripeptide containing one molecule each of serine, valine, and glycine. Using three-letter abbreviations for the amino acids, draw the six possible sequences of amino acids.arrow_forwardthe answer to the problem is 0.998 and i do not know how to get there. do not give me any other number for the answer.arrow_forwardThe melanocyte-stimulating peptide hormone a-melanotropin has the following sequence:Ser–Tyr–Ser–Met–Glu–His–Phe–Arg–Trp–Gly–Lys–Pro–Val(a) Write the sequence using the one-letter abbreviations.(b) Calculate the molecular weight of a-melanotropin, using data inTablearrow_forward
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