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Identify: (a) one allosteric activator of pyruvate kinase and (b) one allosteric inhibitor of PK (2...
Pyruvate kinase catalyzes the last reaction in the glycolytic pathway: phosphoenolpyruvate (PEP) + ADP --> pyruvate...
Pyruvate kinase catalyzes the last reaction in the glycolytic
pathway:
phosphoenolpyruvate (PEP) + ADP --> pyruvate + ATP
There are four different mammalian forms of pyruvate kinase. All
catalyze the same reaction, but they differ in their response to
the glycolytic metabolite fructose-1,6-bisphosphate (F16BP).
The activity of two forms of pyruvate kinase was measured at
various concentrations of PEP, as shown below. Activity was
measured in the presence (blue circles) and absence (red circles)
of F16BP.
Pyruvate Kinase Form 1...
Pyruvate kinase catalyzes the last reaction in the glycolytic pathway: phosphoenolpyruvate (PEP) + ADP --> pyruvate...
Pyruvate kinase catalyzes the last reaction in the glycolytic
pathway:
phosphoenolpyruvate (PEP) + ADP --> pyruvate + ATP
There are four different mammalian forms of pyruvate kinase. All
catalyze the same reaction, but they differ in their response to
the glycolytic metabolite fructose-1,6-bisphosphate (F16BP).
The activity of two forms of pyruvate kinase was measured at
various concentrations of PEP, as shown below. Activity was
measured in the presence (blue circles) and absence (red circles)
of F16BP.
Pyruvate Kinase Form 1...
Pyruvate kinase is subject to allosteric regulation. i) Describe the metabolic importance of regulating flux through...
Pyruvate kinase is subject to allosteric regulation. i) Describe the metabolic importance of regulating flux through the pyruvate kinase reaction. [5] ii) Explain the advantage of activating pyruvate kinase with fructose-1,6-bisphosphate. [5]
Alanine is an allosteric inhibitor of liver pyruvate kinase. What might be the reason? In choosing...
Alanine is an allosteric inhibitor of liver pyruvate kinase. What might be the reason? In choosing your answer consider the role of alanine in the glucose-alanine cycle. Select one: a. It reduces the amount of ATP available for the urea cycle. b. It reduces the availability of pyruvate as an acceptor for the amino-groups derived from alanine. c. It reduces the use of phosphenolpyruvate in glycolysis. d. It increases the synthesis of glycerol-3-phosphate for fat biosynthesis. e. It reduces the...
Can any one do 2 and 3 Pyruvate kinase is one of the irreversible steps of...
Can any one do 2 and 3
Pyruvate kinase is one of the irreversible steps of glycolysis. The human genome has four genes that encode different pyruvate kinases, including a muscle specific form and a liver specific form. The liver specific form differs from the muscle specific form since it has additional regulation through phosphorylation by protein kinase A and allosteric regulation by the amino acid alanine. A V. vs. [S] plot of liver pyruvate kinase is shown below. hi...
Pyruvate Kinase, an allosteric enzyme, accelerates the conversion of phosphoenolpyruvate to pyruvate. 1) Draw curves describing...
Pyruvate Kinase, an allosteric enzyme, accelerates the conversion of phosphoenolpyruvate to pyruvate. 1) Draw curves describing the way the speed of the reaction depends on the concentration of substrate, both in the presence of allosteric effectors (activating and inhibiting), and without effectors. 2) Explain the molecular mechanism by which each of the effectors influences the link between the activity of an enzyme and the concentration of the substrate, both according to the concerted model and the sequential model. 3) Does...
3. It is uncommon for one molecule to act as both an activator and inhibitor in...
3. It is uncommon for one molecule to act as both an activator and inhibitor in metabolism. Which of the following molecules both activates glycolysis and inhibits gluconeogenesis? A. NAD B. Fructose 1,6-bisphosphate C. Pyruvate D. Fructose 2,6-bisphosphate E. Glucose 6-phosphate 4. Regulation of phosphorylase is by phosphorylation. However, this covalent modification increases or decreases activity without completely inhibiting it. The velocity plot is sigmoidal. What statement can be made about this enzyme? A. It likely follows a Michaelis-Menten kinetic....
1. Which enzyme is NOT part of the GNG process? a .Pyruvate kinase b. Pyruvate carboxylase...
1. Which enzyme is NOT part of the GNG process? a .Pyruvate kinase b. Pyruvate carboxylase c. Phosphoenolpyruvate carboxykinsase d. Glucose-6-phosphatase 2. Which molecule can NOT be derived from pyruvate in human? a. Oxaloacetate b. Acetyl CoA c. Lactate d. Ethanol 3. Which one of the following statements regarding the ruminant gluconeogenesis process is correct? a. It leads to net gain of ATP. b. It begins with propionate. c. It begins with lactate. d. It begins with pyruvate.
PART A OPTIONS FOR BLANKS: 1- inhibits, does not affect, stimulates 2- fructose-1,6-biphosphatase-1, pyruvate kinase, phosphofructokinase-1...
PART A OPTIONS FOR BLANKS:
1- inhibits, does not affect, stimulates
2- fructose-1,6-biphosphatase-1, pyruvate kinase,
phosphofructokinase-1
3- phosphofructokinase-1, fructose-1,6-biphosphatase-1,
phosphoenolpyruvate carboxylate
PART B OPTIONS FOR BLANK:
Activity Curve A, Neither, Activity Curve B
Part 1 (3 points) See Hint High levels of fructose-2,6-BP reciprocally regulate glycolysis and gluconeogenesis. Fructose-2,6-BP flux through the glycolytic pathway by increasing the activity of Flux through the gluconeogenic pathway is inhibited by fructose-2,6- BP, which decreases the activity of Part 2 (1 point) See Hint...
The reaction catalysed by pyruvate kinase is: K'eg 3.63 x 105 Phosphoenolpyruvate + ADP -> pyruvate ATP a) Calculate the AG°" for this reaction. Show your working. 3 marks b) The hydrolysi...
The reaction catalysed by pyruvate kinase is: K'eg 3.63 x 105 Phosphoenolpyruvate + ADP -> pyruvate ATP a) Calculate the AG°" for this reaction. Show your working. 3 marks b) The hydrolysis of ATP has following equation: ATP+H20ADP P AG-30.5 kJ/mol Calculate the AG" for the following reaction: Phosphoenolpyruvate -> pyruvate Pi Show your working. 2 marks c) At 37 °C, the steady-state concentrations of phosphoenolpyruvate, ATP, and ADP have been measured to be 23 μΜ, 1.85 mM and 140...
Pyruvate kinase catalyzes the last reaction in the glycolytic
pathway:
phosphoenolpyruvate (PEP) + ADP --> pyruvate + ATP
There are four different mammalian forms of pyruvate kinase. All
catalyze the same reaction, but they differ in their response to
the glycolytic metabolite fructose-1,6-bisphosphate (F16BP).
The activity of two forms of pyruvate kinase was measured at
various concentrations of PEP, as shown below. Activity was
measured in the presence (blue circles) and absence (red circles)
of F16BP.
Pyruvate Kinase Form 1...
Pyruvate kinase catalyzes the last reaction in the glycolytic
pathway:
phosphoenolpyruvate (PEP) + ADP --> pyruvate + ATP
There are four different mammalian forms of pyruvate kinase. All
catalyze the same reaction, but they differ in their response to
the glycolytic metabolite fructose-1,6-bisphosphate (F16BP).
The activity of two forms of pyruvate kinase was measured at
various concentrations of PEP, as shown below. Activity was
measured in the presence (blue circles) and absence (red circles)
of F16BP.
Pyruvate Kinase Form 1...
Can any one do 2 and 3
Pyruvate kinase is one of the irreversible steps of glycolysis. The human genome has four genes that encode different pyruvate kinases, including a muscle specific form and a liver specific form. The liver specific form differs from the muscle specific form since it has additional regulation through phosphorylation by protein kinase A and allosteric regulation by the amino acid alanine. A V. vs. [S] plot of liver pyruvate kinase is shown below. hi...
3. It is uncommon for one molecule to act as both an activator and inhibitor in metabolism. Which of the following molecules both activates glycolysis and inhibits gluconeogenesis? A. NAD B. Fructose 1,6-bisphosphate C. Pyruvate D. Fructose 2,6-bisphosphate E. Glucose 6-phosphate 4. Regulation of phosphorylase is by phosphorylation. However, this covalent modification increases or decreases activity without completely inhibiting it. The velocity plot is sigmoidal. What statement can be made about this enzyme? A. It likely follows a Michaelis-Menten kinetic....
PART A OPTIONS FOR BLANKS:
1- inhibits, does not affect, stimulates
2- fructose-1,6-biphosphatase-1, pyruvate kinase,
phosphofructokinase-1
3- phosphofructokinase-1, fructose-1,6-biphosphatase-1,
phosphoenolpyruvate carboxylate
PART B OPTIONS FOR BLANK:
Activity Curve A, Neither, Activity Curve B
Part 1 (3 points) See Hint High levels of fructose-2,6-BP reciprocally regulate glycolysis and gluconeogenesis. Fructose-2,6-BP flux through the glycolytic pathway by increasing the activity of Flux through the gluconeogenic pathway is inhibited by fructose-2,6- BP, which decreases the activity of Part 2 (1 point) See Hint...
The reaction catalysed by pyruvate kinase is: K'eg 3.63 x 105 Phosphoenolpyruvate + ADP -> pyruvate ATP a) Calculate the AG°" for this reaction. Show your working. 3 marks b) The hydrolysis of ATP has following equation: ATP+H20ADP P AG-30.5 kJ/mol Calculate the AG" for the following reaction: Phosphoenolpyruvate -> pyruvate Pi Show your working. 2 marks c) At 37 °C, the steady-state concentrations of phosphoenolpyruvate, ATP, and ADP have been measured to be 23 μΜ, 1.85 mM and 140...
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