In terms of structure, what is the commonality between aldolase (glycolyssis) and transaldolase (PPP)
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In terms of structure, what is the commonality between aldolase (glycolyssis) and transaldolase (PPP)
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- There is another class of aldolase enzymes known as Class II. These enzymes are found in fungi, algae, and some bacteria. This class differs for Class I in that these enzymes do not have a Lys residue associated with their active sites, but contain a divalent cation (usually Zn2+ or Fe2+) in the active site. Outline a possible mechanism for a Class II aldolase and explain the function of the metal ion in the reaction.The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvate to form acetyl‑CoA. E1E1 , E2E2 , and E3E3 are abbreviations for the enzymes of the complex. Classify the enzyme names, prosthetic groups, and reactions as E1E1 , E2E2 , or E3E3 .A mutated IDH1 isoenzyme is found in a high percentage of a type of brain cancer called glioblastoma. Instead of converting isocitrate to α-ketoglutarate, mutated IDH1 converts its substrate to 2-hydroxyglutarate, a circumstance that disrupts the citric acid cycle, among other effects. Review the structures of isocitrate and α-ketoglutarate and determine the structure of 2- hydroxyglutarate
- The conversion of glutamate to alpha-ketoglutarate is an example of oxidative deamination. Give the complete chemical equation of the said pathway. What happens to the second product of this reaction?With regard to the glyceraldehyde-3-phosphate dehydrogenase enzyme reaction: The product of this reaction is “rather special”. CommentWhat is the quaternary structure of glycogen phosphorylase? How would you characterize the allosteric effects of its small molecule substrate? (one word) What allosteric model (mechanism) that you have learned does it seem to follow? (one acronym)
- Name the following enzymes:a. enzyme responsible for the cutting of the sugar on the nonreducing ends of glycogen branches b. enzyme that is only present in the liver and kidney during glycogen utilization c. enzyme that catalyzes the transfer of a two-carbon fragment from a ketose donor to an aldose acceptor in PPPList all the enzymes necessary and in the right sequence for the complete hydrolysis of ganglioside GM1 to its products. Name the product/s of each enzyme??One of the consequences of ethanol addiction is fattyliver disease, an illness in which liver cells accumulatetriacylglycerols, the esters derived from glycerol and fattyacids. Ethanol is oxidized in the cytoplasm of liver cells byalcohol dehydrogenase and aldehyde dehydrogenase to yieldacetate and 2 NADH. Acetate is then transported into themitochondrion, where it is converted to acetyl-CoA andmetabolized by the citric acid cycle. When alcohol is consumed in excessive quantities, the resulting high levels ofNADH cause metabolic abnormalities, one of which is highlevels of fatty acid synthesis. Fatty acid synthesis, also acytoplasmic process, uses acetyl-CoA as a substrate andNADPH as a reducing agent. Determine how a high level ofcytoplasmic NADH provides a source of NADPH for fattyacid synthesis.
- How many molecules of acetyl-CoA result from catabolism of 1 molecule of glyceryl trilaurate? (Hint: See Worked Example 24.3 and don’t forget glycerol.)What is the source of the glycerol in triacylglycerol synthesis?Draw the structures of the following coenzyme molecules: 1. CoA-SH/Acetyl-S-CoA 2. NAD*/NADH + H* • For both: Give full name (if you copy the formula from an Internet source, please cite it properly, for example, according to the Chicago Manual of Style. • Indicate what are the chemical groups that are active in these molecules, i.e., what group participates in metabolic reactions (be aware that both molecules may be involved in both anabolic and catabolic processes). • What vitamin or vitamins will, when modified, contribute to the structure of these molecules? • Write a short, general conclusion of the importance of these two coenzymes in metabolism.