Question

2. If you were investigating the effect of metabolic inhibitors on a protein in a cell...

2. If you were investigating the effect of metabolic inhibitors on a protein in a cell why might GAPDH not be the best housekeeping protein ?

3. What are two housekeeping proteins that you could use as an alternative?

4. Densitometry is often used to try to quantify Western Blotting results. Can you see any problems with this approach?

Homework Answers

Answer #1

House-keeping genes: Genes that are expressed constitutively in all the cells.
Tissue-specific genes/Regulated genes: Genes that are expressed only in certain tissues at a certain point of time

Two house-keeping genes that can be used as alternatives:
1. Ubiquitin
2. Actin

Densitometry is a visual method of measuring the intensity of a band on the gel. It is not an absolute method i.e. it compares the intensity of the band with another region on the gel.
It only gives an approximate value, not an absolute concentration of the sample.
If there are high density bands on the gel, the measurement is less sensitive.

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