Concept explainers
To estimate: The K value from the given data that describes the ligand binding to a protein.
Concept introduction: Dissociation constant is the equilibrium constant at which the ligand dissociates from the protein. It is denoted as K. Y is fractional saturation of the ligand occupying the ligand-binding site in the protein, or it can be defined as the number of ligands that has dissociated from the protein. K is achieved when fractional saturation is half at a particular ligand concentration.
Answer to Problem 1E
Answer: The dissociation constant is estimated by plotting the values in a graph and finding the ligand concentration when Y is 0.5 (half of fractional saturation).
Pictorial representation:
Fig.1 shows a graph with ligand (mM) in the X-axis and Y in the Y-axis.
Fig.1: Graph of ligand (mM) vs Y to estimate K.
Explanation of Solution
Explanation:
When fractional saturation is half, it means that the ligand has occupied half of the ligand binding site in the protein. When fractional saturation is half, half of the ligand is bound to half the number of proteins in the medium. Half of proteins and half of ligands are free in the medium. This can be called as the equilibrium state of the ligand-protein binding reaction, and thus K is obtained at half of the fractional saturation.
A graph is plotted with ligand concentration in mM on the X-axis and Y, the fractional saturation, on the Y-axis with the given data. At half of fractional saturation, that is, at equilibrium state, the corresponding ligand concentration is 0.6 Mm, which is evident from the graph.
Conclusion: From the graph plotted for the given values, the K value is 0.6mM.
Want to see more full solutions like this?
Chapter 7 Solutions
Fundamentals of Biochemistry: Life at the Molecular Level
- a) What are the differences between the Direct & Indirect Immunofluorescence Assays? (0.5 mark) b) What are the advantages of the Indirect Immunofluorescence Assays? (0.5 mark) c) A Super-Resolution Imaging Technique was developed in 2018 using imidazole, a His-tag ligand conjugated with a fluorophore to report the presence of a recombinant His-tag protein target, (Sci Rep, 2018, 8:5507). How does this technique improve the image quality? (2 marks)arrow_forwarda) What are the differences between the Direct & Indirect Immunofluorescence Assays? b) What are the advantages of the Indirect Immunofluorescence Assays? c) A Super-Resolution Imaging Technique was developed in 2018 using imidazole, a His-tag ligand conjugated with a fluorophore to report the presence of a recombinant His-tag protein target, (Sci Rep, 2018, 8:5507). How does this technique improve the image quality?arrow_forwardCalculate the number of ATP produced from oxidation of 1 molecule of glucosearrow_forward
- Example 1: 1. Suppose an enzyme (MW = 5,000 g/mole) has a concentration of 0.05 mg/L. If the kcat is 1 x 10 s, what is the theoretical maximum reaction velocity for the enzyme? A) 1050 µM/s. B) 100 µM/s. C) 150 μM/s. D) 105 μM/s.arrow_forwardIn 1956, E. P. Kennedy and S. B. Weiss published their study of membrane lipid phosphatidylcholine (lecithin) synthesis in rat liver. Their hypothesis was that phosphocholine joined with some cellular component to yield lecithin. In an earlier experiment, incubating 32 P-labeled phosphocholine at physiological temperature (37 °C) with broken cells from rat liver yielded labeled lecithin. This became their assay for the enzymes involved in lecithin synthesis. Determine the optimal pH for this enzyme and characterize the enzyme activity at different pH values. -O-P-O-CH2-CH₁₂-N(CH3)3 Phosphocholine H₂C-O-C-R HC-O-C-R2 + + + Cell fraction + ? HC-O-P-O-CH₁₂-CH₂-N(CH), O Phosphatidylcholine The researchers then centrifuged the broken cell preparation to separate the membranes from the soluble proteins. They tested three preparations: whole extract, membranes, and soluble proteins. Table 1 summarizes the results. Table 1: Cell fraction requirement for incorporation of 32p-phosphocholine into…arrow_forwardResearchers isolated an unknown substance, X, from rabbit muscle. They determined its structure from the following observations and experiments. (a) Qualitative analysis showed that X was composed entirely of C, H, and O. A weighed sample of X was completely oxidized and the H2O and CO2 produced were measured. This quantitative analysis revealed that X contained 40.00% C, 6.71% H, and 53.29% O by weight. (b) The molecular mass of X, as determined by mass spectrometry, was 90.00 atomic mass units (u). (c) Infrared spectroscopy showed that X contained one double bond. (d) X dissolved readily in water, and the solution demonstrated optical activity when tested in a polarimeter. (e) The aqueous solution of X is acidic. What is the empirical formula of X?arrow_forward
- Show work. don't give Ai generated solution....give correct solutionarrow_forwardBiochemistry What is the process of "transamination" in either the muscles or the liver, that involves keto acid or glutamic acid? Please explain how the steps work. Thank you!arrow_forwardBiochemistry Please help. Thank you What is the importance of glutamic acid in the metabolism of nitrogen from amino acids? (we know therole; it’s used to remove the nitrogen from amino acids so that the remaining carbon skeleton can bebroken down by the “usual” pathways, but what is the important, unique role that only glutamicacid/glutamate can do?)arrow_forward
- Biochemistry Please help. Thank you When carbamyl phosphate is joined to L-ornathine, where does the energy for the reaction come from?arrow_forwardBiochemistry Question Please help. Thank you What is the function of glutamate dehydrogenase?arrow_forwardBiochemistry Question Please help. Thank you How and why does a high protein diet affect the enzymes of the urea cycle?arrow_forward
- BiochemistryBiochemistryISBN:9781319114671Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.Publisher:W. H. FreemanLehninger Principles of BiochemistryBiochemistryISBN:9781464126116Author:David L. Nelson, Michael M. CoxPublisher:W. H. FreemanFundamentals of Biochemistry: Life at the Molecul...BiochemistryISBN:9781118918401Author:Donald Voet, Judith G. Voet, Charlotte W. PrattPublisher:WILEY
- BiochemistryBiochemistryISBN:9781305961135Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougalPublisher:Cengage LearningBiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage LearningFundamentals of General, Organic, and Biological ...BiochemistryISBN:9780134015187Author:John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. PetersonPublisher:PEARSON