What is the committed step in the synthesis of nucleotides? Synthesis of phosphoribosylpyrophosphate Synthesis of carbamoyl phosphate Synthesis of phosphoribosylamine . Synthesis of ribose-5-phosphate Formation of inosine monophosphate
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- Unbranched homopolymer of N-acetyl glucosamine is : 1.Cellulose 2.Chitin 3.Curcumin 4.Concanavalin AStarting from glutamine + aspartate + glycine + CO + N-formyl-THF + ribose-5-P: How many ATP equivalents (GTP is an ATP equivalent) are required for the synthesis of the purine nucleotide ATP?Which enzyme activity would be inhibited if fluorodeoxyuridine-5'- monophosphate is present? thymidylate synthase ribonucleotide reductase dihydrofolate reductase thymidine kinase
- What is the role of tyrosine in prostaglandin synthesis? Tyrosine provides the proton to the double bond initiating the cascade for ring formation. Tyrosine is the source of the hydroxyl groups that converts PGH to PGD2 and PGF. Tyrosine provides a hydrogen free radical that initiates the cascade synthesizing the prostaglandins. Tyrosine provides hydrogen bonding interaction that immobilizes arachidonic acid for conversion by cyclooxygenases (COX) Tyrosine is a catalytic residue at the active site of COX.Phosphoribosyltransferase (PRT) catalyzes the attachment of a salvaged purine nitrogenous base on the activated form of ribose-5-phosphate called 5-phosphoribosyl- α α-pyrophosphate ( α α-PRPP). True Or FalseWhich of the following statements are descriptions of metal ion catalysis or examples of metal ion catalysis? Choose all correct answers a Zn²+ cofactor may properly orient the substrate in the active site through ionic interactions. a covalent bond forms between enzyme and substrate lowers the energy or stabilizes the transition state or intermediate catalyst retains its original form after reaction occurs catalysts may participate in oxidation-reduction reactions by changes in the oxidation state
- It is important to note that galactose is an important component of glyco- proteins. What is the effect on glycoprotein synthesis in case of galactosemic patients who are not given galactose in their diet? Explain this observation.Draw in detail the pathway of de novo synthesis of deoxythymidine phosphate and provide a brief explanation.What is the difference between an enol phosphate and a normal phosphate ester that gives PEP such a high phosphoryl group transfer potential?
- Acetylating agents such as acetic anhydride react preferentially with primaryamines, iodoacetate reacts preferentially with sulfhydryl groups (see Tools of Biochemistry 5B), and ATP-dependent kinases preferentially add a phosphoryl group to side-chain hydroxyl or phenolic —OH groups. Which amino acid side chains, or main-chain groups, in a polypeptide are most likely to be modified by treatment with:(a) acetic anhydride(b) iodoacetate(c) a kinase + ATPCollagen is unusual in its amino acid composition and requires a wide variety of posttranslational modifications to convert it to a functional molecule. Because of the complexity of collagen synthesis, there are many diseases, resulting in structural weaknesses in connective tissue, caused by defects in the process. Scurvy leads to a less stable collagen lacking sufficient hydroxyproline. 4-Hydroxylation of specific prolyl residues during collagen synthesis requires all of the following except A. Fe2+ B. a specific amino acid sequence at the site of hydroxylation. C. ascorbic acid. D. co-hydroxylation of lysine . E. individual α-chains, not yet assembled into a triple helix.The core of pectin molecules is a polymer of a (1®4)-linked D-galacturonate. Draw one of its residues.