The zinc ion in zinc fingers is coordinated through histidine and cysteine residues.
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Modified true or false. Write the correct answer if the underlined word is false.
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- 3. Why glycogen in muscle cells cannot be stained blue-black by iodine solution?9. If a commercially available insulin preparation contains 1 ppm of pro-insulin, how many micrograms of proinsulin would be contained in a 10-mL vial of insulin?4. The strength of ligand-protein binding is a property of the binding site called --------------
- 1. What secondary structure elements comprise each zinc finger? 2. What holds together the fold of an individual zinc finger domain?1. Show the Dehydration Synthesis reaction that occurs to form a dipeptide containing the following amino acids: i) cysteine and serine leucine and lysine4. Draw the following amino acids linked by peptide bonds: a. aspartate b. lysine c. cysteine d. tryptophan Indicate the letter designation for each amino acid.
- 2.Draw the structures of the amino acids tyrosine and aspartic acid2. Classify the following amino acids as nonpolar, polar basic, polar acidic, or polar neutral. (a) (b) (c) (d) H2N-CH-C-O H2N CH-C OH H2N-CH-C-OH H,N--CH-C-OH CH2 CH-OH CH2 CH, C=0 CH3 CH-CH3 OH CH3 229 OH9. Identify the N-terminal and C-terminal amino acid in each peptide. H,N-CH-C-Ņ–CH-C-o- CH2 H CH3 ČH(CH3)2 HÑ-CH-C-Ņ-CH-C-N–CH–C-O- CH2 H ČH3 H ČH,CH,CONH, a.
- 2. Chymotrypsin, trypsin, and elastase are members of a family of enzymes referred to as serine proteases. The enzyme papain (found in papaya) is also a protease but is a member of a family of enzymes referred to as cysteine proteases. The amino acid residues in the active site of papain critical for peptide bond hydrolysis are a protonated histidine and a deprotonated cysteine residue. The cysteine residue functions as the nucleophile similarly to the serine residue in serine proteases. (a) Using what you know about chymotrypsin's mechanism, draw a reaction mecha- nisn for the hydrolysis of a peptide bond by papain. Does the mechanism you have drawn employ acid-base catalysis, covalent catalysis, (b) or both? (c) The pKa values of the active site residues that control the pH profile of the activity of pa- pain are 4.2 and 8.2. The pH optimum for the reaction is 6.0. Through the many years of re- search carried out on cysteine proteases, it has been demonstrated that the pKa of 4.2…1. Draw the structure of the following fatty acids: (a) Stearic acid (b) Arachidonic acid7. During amino acid catabolism, how is amino group removed and excreted in the form of urea? Please write the reactions starting from a generic amino acid to the formation of urea. Please indicate the names of enzymes, cofactors, names of substrates, and products of each reaction and the location of the reaction i.e. whether in cytoplasm or mitochondria.