Draw the product of the reaction of acetyl CoA with ACP-SH catalyzed by malonyl-CoA-acetyl-CoA-ACP transacylase (MAT). Provide the structure in the protonation state found in physiological conditions. SCOA malonyl-CoA-acetyl-CoA-ACP transacylase Q
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- can you tell me step by step, what is happening to convert L-luciferin to D-luciferin? the chemistru behind it vur IvatuvI conditions. H,N COOH DOH .COOH HS L-cysteine L-luciferin D-luciferin Luciferyl-CoA synthase (Luciferase) ATP, Mg, COA OH -COA COA -COA L-luciferyl-CoA (enol) D-luciferyl-CoA hydrolysis hydrolysis enzyme enzyme COOH HO L-luciferin D-luciferin Download : Download full-size imageImidazoleglycerol‑phosphate dehydratase is an enzyme in the histine biosynthesis pathway. It catalyzes the E1 dehydration of D‑erthyro‑imidazole‑glycerol phosphate to imidazole acetol‑phosphate. This is a rare example of a biological E1 reaction, as most biological elimination reactions occur through E1cB instead. In this reaction, D‑erthyro‑imidazole‑glycerol phosphate is first protonated to form a good leaving group. Then, the leaving group is ejected to form the resonance‑stabilized carbocation shown. Draw curved arrows forming the most stable resonance structure to explain why this reaction goes through an E1 mechanism. Draw curved arrows to form the most stable resonance structure.a Lactate dehydrogenase H H3C-C-coO- ОН ooc-C-CH3 L-(+)-Lactase Pyruvate This is a(an) b Creatine kinase CH3 O CH3 O H2N, АТР ADP NH2 NH2 Adenosine triphosphate Adenosine diphosphate Creatine Phosphocreatine This is a(an)
- Selective and specific inhibitors of acetyl-CoA carboxylase have been proposed to be potential anti-obesity drugs. (i) What is the effect of an inhibitor of acetyl-CoA carboxylase on fatty acid synthesis and fatty acid oxidation? Figure 5 shows the structures of the inhibitors of acetyl-CoA carboxylase: CABI-COA and CABI. What structural features of CABI make it a potential inhibitor of acetyl-CoA carboxylase?One of the steps in the pentose phosphate pathway for glucose catabolism is the reaction of xylulose 5-phosphate with ribose 5-phosphate in the presence of a transketolase to give glyceraldehyde 3-phosphate and sedoheptulose 7-phosphate. (a) The first part of the reaction is nucleophilic addition of thiamin diphosphate (TPP) ylide to xylulose 5-phosphate, followed by a retro-aldol cleavage to give glyceraldehyde 3-phosphate and a TPPcontaining enamine. Show the structure of the enamine and the mechanism by which it is formed. (b) The second part of the reaction is addition of the enamine to ribose 5-phosphate followed by loss of TPP ylide to give sedoheptulose 7-phosphate. Show the mechanism.The final step in the metabolic degradation of uracil is the oxidation of malonic semialdehyde to give malonyl CoA. Propose a mechanism.
- In glycerol metabolism, the oxidation of sn-glycerol 3-phosphate to give dihydroxyacetone phosphate is catalyzed by sn-glycerol-3-phosphate dehydrogenase, with NAD+ as cofactor. The reaction is stereospecific, occurring exclusively on the Re face of the nicotinamide ring.In the glycolytic pathway, a six-carbon sugar (fructose 1,6-bisphosphate) is cleaved to form two three-carbon sugars, which undergo further metabolism . In this pathway, an isomerization of glucose 6-phosphate tofructose 6-phosphate (shown below) occurs two steps before the cleavage reaction (the intervening step is phosphorylation of fructose 6-phosphate to fructose 1,6-bisphosphate ). What does the isomerization step accomplish from a chemical perspective? (Hint: Consider what might happen if the C—C bond cleavage were to proceed without the preceding isomerization.)The rate-limiting step is a metabolic pathway is the slowest step which determines the overall rate of the other reactions in the pathway. In glycolysis, the rate limiting step is a phosphorylation reaction where phosphofructokinase (PFK-1) catalyzes the reaction fructose-6-bisphosphate -> fructose-1,6-bisphosphate, the same step in gluconeogenesis. Select one: The statement is FALSE. The statement is TRUE.
- Cholesterol-lowering drugs commonly target O HMG-COA synthase, the enzyme that catalyzes the synthesis of mevalonate O pyruvate decarboxylase complex, which catalyzes the synthesis of acetyl-CoA O mevalonate, an isoprene O HMG-COAreductase, the rate-limiting enzyme in cholesterol biosynthesis O HMG-CoA synthase, the enzyme that catalyzes the first step in cholesterol biosynthesis1 of 4 Part A NADH + H* NAD' OH O H,C-C-C-o H,C-C-C-O Pyruvute Lactate dehydrogenase H. Lactate Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. 2C Q O ® H: contIllustrate the concerted pathway for the following reaction. H2 Pt