How is gfp eluted from the nickel agarose beads

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Reference no: EM132598829

1. How does the Histidine "tag" allow us to purify the GFP?

2. How is GFP eluted from the nickel agarose beads? Can you think of an alternative way of doing this?

3. Why is a hexa-histidine tag used, rather than another length of histidines (e.g. deca-histidine)?

4. Can you think of a downstream application where it would be undesirable for a purified protein to have an affinity tag attached? How could you come up with a construct where the tag is removable or remove an existing tag?

5. How does lysozyme aid in bacterial lysis?

6. What is sonication? Why do we sonicate our bacterial cells?

7. Why are DNase and MgCl2 added to the lysed bacteria?

8. We will examine aliquots of pre-induction and post-induction bacterial culture by SDS-PAGE. Considering that these aliquots will contain differing amounts of bacteria, how can we ensure that we apply suitable and comparable levels of protein to the gel?

Reference no: EM132598829

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