Protein isolation Bacteria - Mycobacterium tuberculosis

Protein isolation is a technique that involves isolation and/ or purification of protein from cells or tissues via chromatography or electrophoresis. The major challenges in protein isolation include: 1. The concentration of proteins in cells is variable and tends to be small for some intracellular proteins. Unlike nucleic acids, proteins cannot be amplified. 2. Proteins are more unstable than nucleic acids. They are easily denatured under suboptimal temperature, pH or salt concentrations. 3. Finally, no generalized technique/protocol can be applied for protein isolation. Proteins may have different electrostatic (number of positively or negatively charged amino acids) or hydrophobic properties. Therefore, protein purification requires multiple steps depending on their charge (a negatively charged resin/column for positively charged proteins and vice-versa), dissolution (using detergents) and unlike in the case of DNA and RNA, instead of using salts, proteins should be isolated by isoelectric precipitation.

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2 years ago

2 years ago by Hollie Fowler United Kingdom

How can I deal with my pellet being too viscous?

I am using 8M Urea to lyse my cells but after centrifugation my pellet is very viscous. This causes me trouble when I try to collect the supernatant. Is there any way to avoid it and do you think it will have an effect on the concentration of my protein?

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Upstream tips
- Colonies are aseptically scraped off culture plates and resuspended in 500 μL distilled water.

- Bacterial cells are subsequently inactivated at 85°C for 30 minutes.

- Inactivated cells are centrifuged at 8,000 rpm for 5 minutes and the supernatant discarded.
Protocol tips
- Total bacterial protein was extracted following the manufacturer protocol. Instead of using 10mL of Native Lysis Buffer it is advised to use 1mL.
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