![]() ![]() Molarity tells us about how many proteins are present in a solution, where concentration just gives us the amount of mass of a protein in solution. Protein molarities are used in many contexts. An antibody has a molecular weight of 150kDa or 150000 Da. Let’s do a common example, getting the molarity of an antibody. ![]() You can also get μM or other scaled molarities: ![]() Let’s do the conversion:īy dividing g/L by g/mol (Da), you are left with just mol/L (M) Usually you will be calculating Molarity from a concentration, such as g/mL. The smallest proteins will have less than 50 amino acids in their chain. To give you an idea of what sizes of proteins to expect, Titin is the largest protein in the human body and it has over 34,000 amino acids and is 3.9 million g/mol. Grams per mol or kilograms per mol are two ways of expressing molecular weight. To understand how to do a protein molarity calculation, let’s begin with important conversions.ġ Dalton (Da) = 1 g/mol, this means that 1 KDa = 1000 g/mol = 1 kg/mol. You can calculate Molarity based on information you have about your protein. The makes the units of Molarity (M), moles/liter. Molarity is the moles of a solute in a liter of solution. These secondary structures further take on a tertiary structure which can happen in many ways. There are two types of secondary structure that a protein chain can take, alpha helix and beta sheet. These many combinations give rise to the diversity of proteins and their functions in nature. There are a large number of combinations that can arise from 20 amino acids, their various placement in a chain, the length of the chain, and the secondary and tertiary structure of the chain. Each amino acid has an amino side chain, a carboxyl group side chain and between them are the atoms unique to each amino acid, typically these unique atoms are called the “side chain” or “r group.” There are 20 amino acids that make up the chains of proteins. Proteins are a type of macromolecule made of amino acids. ![]()
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