1 2 3 BME +BME - BME +BME migration
Proteins
We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.
Protein Expression
The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.
A protein gives a single band on SDS gel electrophoresis, as shown in
lanes 1 and 2 below. There is little, if any, effect from adding β-mercaptoethanol (BME) to the sample; if anything, the protein runs a little bit
slower. When treated with the proteolytic enzyme thrombin and electrophoresis in the absence of BME, the protein migrates a bit
more rapidly (lane 3). But if BME is present, two much more rapidly
migrating bands are found (lane 4). Explain these results in terms of a
model for the protein.
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