Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book.
Determining the Length of a Keratin Molecule The central rod domain of a keratin protein is approximately 312 residues in length. What is the length (in A) of the keratin rod domain? If this same peptide segment were a true
To Determine: The length of the keratin rod domain should be determined along with the length of the peptide segment when the same peptide segment were a true a helix. Length of the segment should be determined when the same segment were a ß sheet.
Introduction: One turn of a helix represents
Beta sheet structure can be pictured as a twofold helix with two residues per turn. The distance between residues in the anti-parallel pleated sheet is
Explanation of Solution
The length of the keratin rod domain =
If the segment were a true helix =
If the segment were an antiparallel beta-sheet =
If the segment were a parallel beta-sheet =
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Chapter 6 Solutions
Biochemistry
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Evaluation of -Helices in Proteins The hem agglutinin protein in influenza virus contains a remarkably long -helix, with 53 residues. How long is this -helix (in nm)? How many turns does this helix have? The typical residue in an -helix is involved in two H bonds. How many H bonds are present in this helix?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Exploring the Dimensions of the α-Helix and Coiled Coils Imagine that the dimensions of the alpha helix were such that there were exactly 3.5 amino acids per turn instead of 3.6. What would be the consequences for coiled-coil structures?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. To fully appreciate the elements of secondary structure in proteins, it is useful to have a practical sense of their structures. On a piece of paper, draw a simple but large zigzag pattern to represent a -strand. Then fill in the structure, drawing the locations of the moms of the chain on this zigzag pattern. Then draw a simple, large coil on a piece of paper to represent an -helix. Then fill in the structure, drawing the backbone atoms in the correction locations along the coil and indicating the locations of the R groups in your drawing.arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. (Historical Context) The Third Person of the -Helix Publication Who was Herman Branson? What was his role in the elucidation of the structure of the or-helix'.' Did he receive sufficient credit and recognition for his contributions? And how did the rest of his career unfold? Do a Google search on Herman Branson to learn about his life, and read the article by David Eisenberg under Further Reading. You may also wish to examine the original paper by Pauling, Corey, and Branson, as well as the following Web site: http://www.pirns. org/sitelmisclclassicsl..shtml Pauling, L., Corey, R. B., and Branson, H. R., 1951. The structure of proteins: two hydrogen-bonded helical configurations of the polypeptide chain. Proceedings of the National Academy of Sciences, USA 37:235-240.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Understanding the Densities of Membrane Components Sucrose gradients for separation of membrane proteins must be able to separate proteins and protein—lipid complexes with a wide range of densities, typically 1.00 to 1.35 g/mL. a. Consult reference books (such as the CRC Handbook of Biochemistry ) and plot the density of sucrose solutions versus percent sucrose by weight (g sucrose per 100 g solution), and versus percent by volume (g sucrose per 100 mL solution). Why is one pint linear and the other plot curved? b. What would be a suitable range of sucrose concentrations for Separation of three membrane-derived protein—lipid examples with densities of 1.03, 1.07, and 1.08 g/mL?arrow_forwardAnswers to all problems are at the end οΓthis book. Detailed solutions are available in the Student Solutions Manual. Study Guide, and Problems Book. Superbug infections are becoming more common around the world. Many of these infections arise from the action of -lactamases, of which there are several types with different mechanisms of action. Consult the end-of-chapter reference by von Nussbaum and Schiffer and write detailed mechanisms for the serine -lactamases and metallo- -lactamases.arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Protein Structure Evaluation Based on Gel Filtration Data A new protein of unknown structure has been purified. Gel filtration chromatography reveals that the native protein has a molecular weight of 240,000. Chromatography in the presence of 6 M guanidine hydrochloride yields a single peak corresponding to a protein of Mr 60.000. Chromatography in the presence of 6 M guanidine hydrochloride and 10mM -mercaptoethanol yields peaks for proteins of Mr 34,000 and 26,000. Explain what can be determined about the structure of this protein from these data.arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Proteins and nucleic acids are informational macromolecules. What are the two minimal criteria for a linear informational polymer?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Protein-DNA Interactions Gerie expression is controlled through the interaction of proteins with specific nucleotide sequences in double stranded DNA. List the kinds of noncovalent interactions that might take place between a protein and DNA. How do you suppose a particular protein might specifically interact with a particular nucleotide sequence in DNA'.’ That is. how might proteins recognize specific base sequences within the double helix?arrow_forward
- Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Solving the Sequence of an Oligopeptide From Sequence Analysis Data Amino acid analysis of ail oligopeptide seven residues long gave The following fads were observed: a. Trypsin treatment had no apparent effect. b. The phenylthiohydantoin released by Lid mini degradation was c. Brief chymotrypsin treatment yielded several products, including a dipeptide and a tetrapeptide. The amino acid composition of the tetrapeptide was Leu, Lyi. and Met. d. Cyanogen bromide treatment yielded a dipeptide, a tetrapeptide, and free Lys. What is the amino acid sequence of this heptapeptide?arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. The Biosynthetic Capacity of Cells The nutritional requirements of Escherichia coli cells are far simpler than those of humans, yet the macromolecules found in bacteria are about as complex as those of animals. Because bacteria can make all their essential biomolecules while subsisting on a simpler diet, do you think bacteria may have more biosynthetic capacity and hence more metabolic complexity than animals? Organize your thoughts on this question, pro and con, into a rational argument. (Section 1.5)arrow_forwardAnswers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book. Interpreting Kinetics Experiments from Graphical Patterns The following graphical patterns obtained from kinetic experiments have several possible interpretations depending on the nature of the experiment and the variables being plotted. Give at least two possibilities for each.arrow_forward
- BiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage Learning