Orders of protein structure: primary, secondary, tertiary, and quaternary. Alpha helix and beta pleated sheet.

Even if you know the sequence, what is the shape of that protein, and based on that shape, how can we use that to think about how to manipulate that protein in different ways or who knows?

Now, any protein that's made up of a single polypeptide is only going to have primary structure, secondary structure and tertiary structure, but if we're dealing with something like hemoglobin, that's …

Learn about the structure of proteins and the diverse roles these molecules play in the cell.

Below we delve more into the interactions that stabilize the tertiary structure (overall fold) and quaternary structure (interactions between subunits) of proteins.

Tertiary structure: A protein’s tertiary structure refers to the overall 3D shape of a single protein molecule, formed by the folding of the secondary structures.

The four levels of protein structure are primary, secondary, tertiary, and quaternary. It is helpful to understand the nature and function of each level of protein structure in order to fully understand how …

Then you have tertiary structure, which just talks about the overall 3D structure of a single protein molecule. And this is described by distant interactions between groups within a single protein.

A It exhibits quaternary structure with multiple polypeptide chains. B It has a secondary structure made of α helices and β sheets. C It is a homopolymer with identical subunits. D

How do we go from the amino acid sequence of a polypeptide to the three-dimensional structure of a mature, functional protein? To learn how interactions between amino acids cause a protein to fold …