Identify a human homologue of the yeast protein

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A genetic screen undertaken in budding yeast has identified a gene whose product encodes a protein kinase that controls the transition of cells from G2 into mitosis. By sequence comparison, you identify a human homologue of the yeast protein, which you name PK1. You now wish to explore the regulation and function of PK1 in cultured human cells.

You wish to study PK1 activity in synchronous populations of cells that are in different stages of the cell cycle

You firstly treat the cells with a named drug in order to synchronise them in a specific stage of the cell cycle.

Having treated multiple plates of cells with the drug, you then wash out the drug and incubate each of the plates for different periods of time (from 0-24 hours)

Cell extracts are prepared for each plate of cells. These are analysed by SDS-PAGE and Western blotting using an antibody that only detects the active (phosphorylated) form of PK1.

At which stage of the cell cycle would you expect the strongest signal for active PK1 to be observed? Briefly explain why this would be the case

Reference no: EM133199245

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