NH₂ Methyltransferases NH₂ OH OH S-Adenosylmethionine (SAM) Transamination B Phosphate transfer Protein Acetyl transfer Transmethylation CH3 DNÁ HO CH3 NH₂ What metabolic reaction is best represented by this chemical equation? SAH-Hydrolase (SAHase) NH₂ OH OH S-Adenosyl-L-Homocysteine (SAH) I OH OH Adenosine NH₂ SH NH₂ Homocysteine
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- Using the ActiveModel for aldose reductase, describe the structure of the TIM barrel motif and the structure and location of the active site.Given each set of information which may include common name(s) and the reaction catalyzed, you are required to identify the main class of the specific enzyme described. _____________________1. Name: alkaline phosphataseReaction: a phosphate monoester + H2O = an alcohol + phosphate_____________________2. Reaction: L-threonine = D-threonine.Other information: Inverts both chiral centers, a racemase. _____________________3. Name: glycine-N-acylaseReaction: acyl-COA + glycine = CoA + N-acylglycine_____________________ 4. Name: lysine decarboxylaseReaction: L-lysine = cadaverine + CO2 _____________________5. Name: methanol dehydrogenaseReaction: methanol + NAD+ = formaldehyde + NADH + H+ _____________________6. Name: citryl-CoA synthetaseReaction: ATP + citrate + CoA = ADP + phosphate + (3S)-citryl-CoA_____________________7. Name: D-xylulose reductaseReaction: xylitol + NAD+ = D-xylulose + NADH + H+ _____________________8. Name: cellobiose phosphorylaseReaction: cellobiose phosphate =…Galactose 1-phosphate: UDP-glucose uridyltransferase (GALT) is an enzyme important for the catabolism of galactose. Patients with GALT deficiency present within days of birth with feeding difficulty, fatigue, jaundice and liver problems, and failure to thrive. In addition, a buildup of galactose and its metabolites are present in the bloodstream. GALT catalyzes the following reaction in galactose catabolism. NOTE that GALT is reversible!! Classify this enzyme and explain why you classified it in this way.
- Assume that all carbon atoms and nitrogen atoms in both alanine and aspartate are labelled with radioisotopes. Then, the radioisotope-labelled alanine and aspartate molecules areallowed to undergo metabolism in the liver. All carbon atoms and nitrogen atoms in both ureaand glutamine are found to be labelled with radioisotopes. Please write down the metabolic reactions that lead to the incorporation of radioisotope-labelled carbon and nitrogen atoms into urea and glutamine.Dicyclohexylcarbodiimide (DCCD) is a reagent that reacts with Asp or Glu residues. Explain why the reaction of DCCD with the c subunits of F1F0-ATP ase blocks its ATP-synthesizing activity.Using the principles described in the text regarding pyridoxal phosphate mechanisms, propose a mechanism for the reaction catalyzed by serine hydroxymethyltransferase.
- Draw a schematic illustration of the hydrolysis of N-acetylphenylalaninamide catalyzed byalpha-chymotrypsin in which you indicate the important catalytic residues in the active site and how thesubstrate undergoes transformation to products through two different tetrahedral intermediates.Enolase catalyzes the reversible reaction shown below. Draw the detailed mechanism for the reaction that occurs in gluconeogenesis, namely the reaction of phosphoenolpyruvate to form 2-phosphoglycerate (the reverse direction in the reaction below).The high phosphoryl transfer potential of 1,3-bisphosphoglycerate is explained by the resonance stability of the product, 3-phosphoglycerate. The same explanation applies to the reaction that generates resonance stabilized pyruvate from phosphoenolpyruvate. Show the resonance structures for both products, 3-phosphoglycerate and pyruvate, and state why the reactant in both reactions is not resonance stabilized.
- The interconversion of DHAP and GAP greatly favors the formation of DHAP at equilibrium. Yet the conversion of DHAP by triose phosphate isomerase proceeds readily. WhyAssume that all carbon atoms and nitrogen atoms in both alanine and aspartate are labelledwith radioisotopes. Then, the radioisotope-labelled alanine and aspartate molecules areallowed to undergo metabolism in the liver. All carbon atoms and nitrogen atoms in both ureaand glutamine are found to be labelled with radioisotopes. Please write down the metabolicreactions that lead to the incorporation of radioisotope-labelled carbon and nitrogen atoms intourea and glutamine.In the hexokinase reaction (in glycolysis) Keq caclualtion, what is the OBVIOUS problem with getting a Keq of 678? what should keq be normally? how can you EXPLAIN a Keq of 678?