A Complete Overview Of Protein Lysate-Isolation, Purification & Preparation

In a common term, lysis means to destruct or break down the cells with enzymic or viral mechanisms. These cells can be bacteria or blood cells on which the action of lysine is performed. In the biological term, the lysate is something that has fluids filled with lysed cells.  In labs, cell cultures are subjected to do the lysis to extract and purify its contents. This lysis process is mainly done for extraction of DNS, extraction of RNA and complete purification of the protein.

For a brief discussion on protein lysate, let’s have a look at its isolation, purification and preparation methods.

Isolation process

In research laboratories, the process of isolation is carried at a temperature ranging from 2 to 8 °C.

  • The first method of isolation is western blotting experiment. In this experiment, cells are subjected to lysing for protein isolation from the samples. The cells are needed to break open to isolate the proteins.
  • Another method of isolation is sonication in which sound waves are utilized for disrupting the cells. This disruption of cells helps in protein isolation from broken cells.
  • One of the easiest methods of isolating the protein is the buffering method. This process is completely dependent on the kind of organism which is being used. This method is all about using buffers to break cells open.
  • Isolation of proteins is also performed through the method of liquid nitrogen grinding. Grinding the samples of protein in the liquid nitrogen helps in isolation of proteins. Elements used in this process mortar, pestle along with liquid nitrogen. The main reason for using liquid nitrogen is that it helps in making the cell structure easier to break.

protein lysate

Purification of protein lysate

Let’s know more about this in a discreet way. The prominent points are being mentioned below.

  • One of the basic steps of protein purification is through crude extract. This crude extract is a combination of all the proteins, nutrients, macromolecules and many other components. Extracts of crude are prepared by removing the cellular debris which got produced by cell lysis. The product is then centrifuged to get purified protein.
  • Another method of purification is by precipitation. In this method, the sample is precipitated in a solution with osmotic strength. Ammonium sulfate is used as the salt in this process.
  • Purification is also performed in labs with reverse-phase chromatography (RPC) process. This helps in separating the proteins that are based on their hydrophobicities. This technique gets perfect results when used with organic solvents. And therefore it is used most often.

Preparation method

Preparation of protein lysate is done through the western blotting method in which the starting material is the crude cellular lysates. It can be prepared from the transfected cells that carry expression vector of protein. After the purification process, characterization of protein is also conducted. Characterization of the pure protein helps in reducing wastage of resources on protein material.

Protein lysate is all about breaking down the cell membranes through different mechanisms. This is a complete overview of the isolation, extraction, purification, and preparation of proteins.

Related Articles