According to Paul Boyer, the mechanism of ATP synthesis involves the rotation of the y subunit which in turn causes sequential conformation changes in the aß assemblies. Explain the steps of ATP synthesis according to this mechanism.
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- Why does growth of ETPUM in Medium # require oxygen? ' ink about this in terms of howETPUM can generate a net gain in ATP by processing polyurethane. Remember that the degradationof polyurethane by polyurethanase does not expend ATP. In order to answer this question, address eachof the following questions in your answer:a. Is there a net gain or loss of ATP during the transport of the citrate?b. Consider the ATPs that can be generated via substrate-level phosphorylation. Will glycolysis beuseful for generating any ATPs during growth on polyurethane? How many ATPs can be generatedvia TCA? Is this enough to support growth (is there a net positive in the ATP tally)?c. Now consider how else ETPUM can generate ATPs (if not by substrate- level phosphorylation). Canthis process generate a net positive in the ATP tally?d. Now explain the importance of oxygen as relates to the ATP tally.How many protons are required to synthesize one ATP by F1F0-ATPase containing (a) 10 or (b) 15 c subunits?Discuss the composition of the transition state for the formation of ATP by ATP Synthase. a) Where is the active site for this enzyme located? b) How are the amino acid side chains from the α and β subunits of ATP Synthase involved? c) Discuss the importance of Mg+2 in the mechanism of this enzyme.
- From these data, is the energy solely from the H+ concentration gradient sufficient to generate ATP from ADP and Pi? If not, suggest how the necessary energy for synthesis of ATP from ADP and phosphate arises.Explain why the coupled reaction ATP → ADP + Pi in the P-class ion pump mechanism does not involve direct hydrolysis of the phosphoanhydride bond.Sonicating a suspension of mitochondria produces submitochondrial particles derived from the innermitochondrial membrane. These membranous vesicles seal inside out, so that the intermembrane space of themitochondria becomes the lumen of the submitochondrial particle. Explain (or diagram) the process of electrontransfer and oxidative phosphorylation in these particles. Assuming all the substrates for oxidativephosphorylation are present in excess, does ATP synthesis increase or decrease with an increase in the pH ofthe fluid in which the submitochondrial particles are suspended? Why?
- Give all the reactions that will produce ATP either by substrate-level phosphorylation (SLP) or by oxidative phosphorylation (OP). If the given require a shuttle system, please indicate both MA shuttle and GP shuttle and give the ATP produced. Given: fructose 6-phosphate to 2pyruvateA suspension of inside-out submitochondrial particles (i.e., the F1 unit is on the outside of the particle) is placed in a solution that contains ADP, Pi, and NADH. Will increasing the proton concentration of the solution result in ATP synthesis? Explain.If K* and valinomycin are added to respiring cells, fully coupled ATP-synthesizing mitochondria, explain what will happen to the pH gradient and the AY. Compare the action of valinomycin with gramicidin in ATP production and electron transport.
- Arrange the sequence of events in Oxidative Phosphorylation. (1-5) As the H+ ions move through the ATP synthase it'll provide the power to make the ATP synthase to turn. As it turns, a phosphate group is added to an ADP, forming a proton gradient-energy as ATP. With the help of a channel protein called ATP synthase, these H* ions are transferred back to the matrix. The electrons are passed to another electron carrier called cytochrome C (cyt C), which carries the = electrons to enzyme complex IV. Here, the last batch of H* ions are pumped into the intermembrane space. Enzyme complexes I and Il then transport the electrons through ubiquinone (Q), a mobile electron carrier. Q is reduced to QH, in the process and delivers the electrons to enzyme complex III. As this happens, more H* ions are pumped into the intermembrane space. The NADH and FADH2 produced from the previous stages of cellular respiration bring electrons across the transport chain to initiate the oxidative phosphorylation.When pure reduced cytochrome c is added to carefully prepared mitochondria along with ADP, Pi, antimycin A, and oxygen, the cytochrome c becomes oxidized, and ATP is formed, with a P/O ratio approaching 1.0.(a) Indicate the probable flow of electrons in this system.(b) Why was antimycin A added?(c) What does this experiment tell you about the location of coupling sitesfor oxidative phosphorylation?(d) Write a balanced equation for the overall reaction (including cyt c oxidation and ATP synthesis).(e) Calculate ΔG°′ for the above reaction, using E′0 values from Table 14.1and a ΔG°′ value for ATP hydrolysis of -32.2 kJ/mol.How would DCMU affect formation of ATP? Of NADPH? Explain.