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- The extinction coefficient or absorptivity (ɛ) of protein A at 340 nm is 6440 M-1 cm-1, whereas protein B does not absorb at 340 nm. What absorbance will be observed when light at 340 nm passes through a 5 mm cuvette containing 10 µM of protein A and 10 µM of protein B? Beer-Lambert-law; A = ɛ x C x1; A = absorbance, C= concentration, 1= pathlength).AH = - 1.2 kcal/mol; Кр 3 16 nM OH 1 HO AH = - 6.0 kcal/mol; Kp = 76 nM OH HOll AH = - 5.5 kcal/mol; Kp = 0.5 nM OH 3 (iv) Consider the molecule 1 being derivatized to yield molecule 2. How would you expect AG for the binding process (to their target) of 2 to compare to 1? Justify your answer.Suppose you have a mixture of the following proteins protein A: pl = 3.5, mw = 35 kDa protein B: pl = 5.5, mw = 22 kDa protein C: pl = 7.5, mw = 77 kDa protein D: pl = 9.0; mw = 52 kDa. Which protein do you expect to elute last if you perform separation using cation exchange chromatography at pH 7.0? A B Oc
- ) To better understand how the lacR works, let's start let's approximate the volume of a bacterial cell by treating it as a cylinder with radius that is 0.5 um and length that is 2 um. What is the volume of the cylinder in liters, L)? Next, let's calculate the concentrations of the lacR (ligand) and the operator site (Op) (primary receptor) in this volume. There are 10 lacR molecules in the cell and 1 operator site. Using this information calculate [lacR] and [Op] in molar units in one cell? (see eq. 13.17 and 13.18).Explain why it has been very difficult to obtain an X-ray crystal structure for the complete nuclear pore complex. Explain in terms of its size, number of proteins as well as its molecular properties (e.g. charge)12 Determine the type of biochemical reaction that occurs in the reaction shown below. O O O O O redox isomerization group C-C bond formation/cleavage transfer hydrolysis/condensation Previous Ex-xx-xx OH (ATP) OH OH OH OH + AMP OH OPO₂² OH OH +AMP1 OH (ADP)
- Which of the following drugs is a less potent microsomal triglyceride transfer protein (MTP) inhibitor, which reduces cholesterol levels? O Structure 1 (IC50 = 23 nM) O BMS-200150 (IC50 = 2.2 µM) O Hybrid Structure (IC50 = 12 nM) %3! O Hit compound (IC50 = 36 µM) %3D Lomitapide (IC50 = 0.5 nM)Give the name and structure of: Ceramide Shiphingomyelin GangliosideA solution contains a mixture of four proteins: urease, ovalbumin, lysozyme, and alkaline phosphatase. The proteins have the following properties. Molecular weight (Daltons) Protein pl Urease 483,000 5.0 Ovalbumin 45,000 4.6 Lysozyme 86,000 11.0 Alkaline 86,000 4.6 Phosphatase Based on the information provided, what type of chromatography (gel permeation or ion exchange) could be used to separate: a) Lysozyme from Alkaline Phosphatase. Briefly explain your answer. b) Ovalbumin from Alkaline Phosphatase. Briefly explain your answer. c) Which of the four proteins would be bound to a cation exchanger equilibrated at pH 5? d) Briefly explain your answer to part c).
- What is the difference of measuring proteins through UV-VIS spectroscopy at 280 nm and at 595 nm with the presence of the Bradford reagent? (note: explain not less than 5 sentences).Titration of alanine by a strong base, for example NaOH, reveals two pk's. Which is the titration reaction occurring at pK1 (pK1 = %3D 2.34)? O-NH2 + COH →-NH + H2O O-COOH + OH →-CO + H20 -COOH + -NH2 → -COO" + -NH2+ -CoO +-NH2* → -COOH +-NH2 O -NH3* + OH →-NH2 + H2OYou have purified Protein 'X' and you want to know its concentration. As we learned, you can calculate concentrations by simply measuring UV280 absorbance of protein solutions. Using a UV spectrophotometer, you measured an absorbance of 0.6. Given that Protein X has an absorptivity (or extinction coefficient) of 0.2 mL•mg-cm at 280 nm, what is the concentration of purified protein solution (assume the light path is 1 cm)? -1 O A. 3 g/mL B. 3 mg/mL OC.0.2mg/mL OD.0.2 g/mL OE. 0.6 g/mL