Define use the cheng-prusoff equation and the value of kd

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Reference no: EM131732769

Problem 3. Competition experiment.

0.5 nM radioligand L* is bound to 1 ml samples of the same membrane samples used in the above experiments in the presence or absence of varying amounts of either compound A or compound B. After establishing equilibrium, the following counts were bound to the membranes (after subtracting nonspecific binding):

Concentration A (nM)

CPM bound with A

Concentration B (nM)

CPM bound with B

0

73001

0

73001

0.05

72100

0.05

66365

0.1

71221

0.1

60835

0.3

67908

0.3

45626

0.5

64890

0.5

36501

1

58401

1

24334

3

41715

3

10429

5

32445

5

6636

10

20858

10

3476

30

8588

30

1197

100

2808

100

363

300

961

300

121


a) Which compound, A or B, is more a more potent displacer of the radioligand? Justify your answer why you think so.

b) Plot the fractional binding on a semilog plot and estimate the IC50s for both A and B.

c) Plot the results on a logit-log plot (pseudo-Hill plot) and determine the IC50s for both compounds A and B. Use these values for the next step. How close are the computed values to your estimate in part b?

d) Use the Cheng-Prusoff equation and the value of Kd for ligand L determined by the Scatchard plot in question 2 to calculate the Ki values for compounds A and B.

Reference no: EM131732769

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