Your protein of interest will not form crystals, and it is 100 kDa in size. You would still like to study it structurally. What technique will you explore next, and why? What limitations might you encounter?
The following image is of my notes and will guide you to techniques used for the analysis of structure of protein
Your protein of interest will not form crystals, and it is 100 kDa in size. You...
Q. Briefly in point form or using a flow chart, describe what chromatographic techniques you would use to completely separate a mixture of the 4 proteins listed below. After each part of the techniques, BRIELFY outline what that particular technique accomplished (or show it in your diagram). Protein A: 35 kDa, pI = 3.5 Protein B: 35 kDa, pI = 8.5 Protein C: 100 kDa, pI = 8.5 Protein D: 100 kDa, pI = 3.5
You have a mixture of the proteins listed below. Protein pI Molecular Weight (kDa) A 3.1 265 B 6.9 93 C 10.3 96 D 7.1 43 E 8.6 189 1. You load the protein mix onto a cation exchange column at pH 5. Next, you apply a "washing" step by passing through buffer at pH 5. Finally, for your elution step, you apply a pH gradient starting from pH 2.0 to pH 13.0. (A gradient buffer system allows you to...
6. If you have two proteins with unknown concentrations (4 points): -sample A: a protein that contains polar uncharged amino acids, negatively charged amino acids and arginines, size: 40 KDa -sample B: a protein rich in lysines, size: 100 KDa A. If you want to separate both proteins, which acrylamide gel concentration would you chose? B. Which staining method (s) would you chose for this gel? Why?
During recrystallization, you allow your product to form solid crystals slowly upon cooling. Why?
You hypothesize that your protein of interest moves from the mitochondria to lysosomes when a cell is exposed to the drug Fantasalin. A. Design a microscopy experiment to test this hypothesis. Please include the LABELS and type(s) of microscopy you would use. Also, please draw illustrations of what you predict your experiment to look like. B. Design an experiment to test this hypothesis using cell fractionation and SDS-PAGE. Please include what samples you would collect to run on the gel,...
4. (Challenge) You are purifying a protein from the brain of patients with an unusual type of dementia triggered by a coronavirus and you hypothesize that this protein may be a signature molecule of this type of dementia. To pursue this hypothesis, you collect brain tissue from patients post mortem, do differential centrifugation, density gradient centrifugation, CM (carboxymethyl cellulose) ion exchange chromatography and gel filtration. You then assess the purity of your protein using both native and SDS gel electrophoresis. The...
Question 6 You and your G-protein coupled receptors o You have encountered G-protein coupled receptors in Intro Bio I lecture (or soon will), and will encounter them briefly again in Intro Bio II. You will spend 2 or 3 lectures on them in Cell Bio. They are integral (transmembrane) proteins embedded in the plasma membrane of every eukaryotic cell in your body. We will treat them as being 50 Angstroms in diameter. Considering the plasma membrane scaled up to the...
NOTES: To separate on a size-exclusion column, differences in MW need to be greater than 10%. To separate proteins by charge, the difference in pI must be at least 0.5 pH unit. Consider the table of four proteins below: Protein Size pI Size exclusion Charge at pH 7.4 DEAE-elution 1 49 kDa 6.8 2 51 kDa 8.1 3 53 kDa 6.4 4 99 kDa 8.3 5 106 kDa 3.8 6 143 kDa 7.9 (a) In what order would the proteins...
Part B. Working as a Biology 499 student, your supervisor would like to examine the protein- protein interaction in the tyrosine kinase complex as shown in the following figure. Specifically, you are asked to show the direct interaction between Sos, Ras and GRB2, in the presence or absence of EGF. Sinding of CAB2 and Sou couples recrgeo to inacie Two separate dishes of cells were each transfected with a different type of Vector DNA: HA GST, HA-Sos. After growing for...
During a recrystallization procedure, if crystals do not form upon cooling to 0 °C: i) Without changing the volume of the solution, what are three methods that can be used to induce nucleation (crystal growth)? Describe each method in one sentence (each). ii) If none of your methods of inducing nucleation works (which you described in Part i), then what experimental steps would you take next in order to achieve recrystallization of the compound? Offer details. Assume that you do...