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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Question
Chapter 2, Problem 37P
Interpretation Introduction
Interpretation:
The meaning of the statement referring post translational modifications as “Nature’s escape from genetic imprisonment” should be explained.
Concept introduction:
Post-translational modifications are mechanisms which amino acid residues in a protein are covalently modified after protein biosynthesis. For example, phosphorylation is most common post translational modification. Glycosylation and lipidation are also post translational modifications. Proteins are modified by modifying existing functional group of a standard amino acid or adding a new functional group.
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Briefly describe each of the following possible posttranslational protein modifications. Give an example of each.
Cross-linkage
glycosylation and phosphorylation
cleavage
assembly into polymeric proteins (> 1 polypeptide)
Posttranslational modifications serve several purposes. Discuss and give examples
Explain the posttranslational control ?
Chapter 2 Solutions
Biochemistry
Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10P
Ch. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17PCh. 2 - Prob. 18PCh. 2 - Prob. 19PCh. 2 - Prob. 20PCh. 2 - Prob. 21PCh. 2 - Prob. 22PCh. 2 - Prob. 23PCh. 2 - Prob. 24PCh. 2 - Prob. 25PCh. 2 - Prob. 26PCh. 2 - Prob. 27PCh. 2 - Prob. 28PCh. 2 - Prob. 29PCh. 2 - Prob. 30PCh. 2 - Prob. 31PCh. 2 - Prob. 32PCh. 2 - Prob. 33PCh. 2 - Prob. 34PCh. 2 - Prob. 35PCh. 2 - Prob. 36PCh. 2 - Prob. 37P
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- What advantages are there for synthesizing an inactive protein that must subsequently be activated by posttranslationalmodifications?arrow_forwardIn posttranslational modification, phosphates are attached to which 3 amino acids? - tyrosine - serine - proline - lysine - threoninearrow_forwardExplain the type of posttranslational modification ?arrow_forward
- A- what are the Genetic Pathways of organisms? Draw a general of it. B- define the term posttranslational modification. Why they are important?arrow_forwardDefine the Posttranslational modifications ?arrow_forwardWhat is meant by the term "sugar code"? What are the challenges in the field of glyco-biology?arrow_forward
- An example of a posttranslational covalent modification that may affect protein function isa. phosphorylation.b. acetylation.c. methylation.d. Any of the above can affect protein function.arrow_forwardWhy might it be advantageous to add a preassembled block of 14 sugar residues to a protein in the er, rather than building the sugar chains step-by-step on the surface of the protein by the sequential addition of sugars by individual enzymes?arrow_forwardThe images shown depict the initiation and elongation steps in protein translation. Arrange the images in the order in which these steps occur. A. B A C D B. B D A C C. C D A B D. A B C Darrow_forward
- Selenocysteine and pyrolysine differ in the way that they areconverted to their cognate charged tRNAs. Explain.arrow_forwardHOW 6 Posttranslational processing can modify polypeptide structure?arrow_forwardWhen glycoproteins are synthesized in the cell, at what stage of the polymerization of the protein are the sugar groups added: Prior to translation, cotranslationally, or posttranslationally?arrow_forward
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