Protein Techniques Reviews

Enzyme kinetics is the study of

study of the rates of enzyme-catalysed chemical reactions

study of the rates of enzyme-catalysed chemical reactions

Enzyme kinetics

monopeptide

single amino acid

dipeptide

two amino acids

What is the significance of the isoelectric point in protein solubility?

The isoelectric point (pI) is the pH at which a protein has no net charge. Proteins are least soluble at pI because electrostatic repulsion is minimized, leading to aggregation and precipitation.

pH at which a protein has no net charge

isoelectric point (pI)

Describe the use of pH titration curves to determine the pKa of amino acids.

Titration curves plot pH against added titrant volume. The pKa is determined at the midpoint of the buffering region where half of the amino acid's acidic groups are deprotonated. This inflection point corresponds to the pKa value.

Compare bacterial expression systems with mammalian cell systems.

Bacteria are rapid and economical but lack post-translational modifications; mammalian cells produce more authentic proteins but are costlier and slower.

How does fermentation optimize protein yield?

It controls parameters like pH, oxygen, nutrients, and temperature to maximize cell growth and protein expression.