15. Which of the following glycans can be released from proteins using BB- elimination? a. Complex N-linked glycans b. Glycosaminoglycans c. Mucin type O- glycans d Hyaluronic acid
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- 1. What is the distinguishing structural feature of O-glycans? 2. What other prominent class of glycoproteins besides mucins is known for the presence of O-linked glycans?15. Which of the following glycans can be released from proteins using ?β-elimination? a. Complex N-linked glycans b. Glycosaminoglycans c. Mucin type O-glycans d Hyaluronic acid 16. Which of the following glycans are made by the addition of sugars to the reducing end of a growing glycan chain? a. Hyaluronan b. Heparan sulfate c. Mucin type O-glycans d. Gangliosides e. Cellulose1.One of the main sources of sphingosine in the body is in the cell membrane. What complication could arise from the biological synthesis of ceramide?
- 1. Draw all the forms of Tyrosine at pH 10.5. I have the predominant form and the protonation and deprotonation values written out, but I'm not sure how to draw the other forms now. 2. Draw the peptide chain arginyl-alanyl-histidyl-cysteinyl-isoleucyl-asparagine at pH 71. How would you demonstrate whether a GAG chain assembles from the reducing end versus the nonreducing end? 2. What factors can affect the fine structure of sulfated glycosaminoglycans in cells?1. Depict the structure features in the active site of cysteine protease 2. provide a step-wise reaction mechanism to show the hydrolysis of the peptide bond catalyzed by a cysteine protease
- 1. A certain polypeptide was treated with trypsin and yielded the following Fragments: Leu-Glu Gly-Tyr-Asn-Arg Gln-Ala-Phe-Val-Lys The same polypeptide was treated with chymotrypsin and yielded the following fragments: Gln-Ala-Phe Asn-Arg-Leu-Glu Val-Lys-Gly-Tyr What is the amino acid sequence of this polypeptide? Instructions Make use of the table below to determine the sequence of the mystery protein.Each of the following statements concerning penicillin is correct EXCEPT: a. Penicillin is a bacteriostatic drug because autolytic enzymes are not activated. b. Penicillin inhibits transpeptidases, which are required for cross-linking peptidoglycan. C. The structure of penicillin resembles that of a dipeptide of alanine, which is a component of peptidoglycan. D. An intact β-lactam ring of penicillin is required for its activity.4 draw the reaction mechanism for the formation of the covalent intermediate in the serine protease chymotrypsin, showing how the active-site amino acid residues participate in the reaction