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There is a third level of protein structure called tertiary structure, and tertiary structure just refers to a higher order of folding within a polypeptide chain.

Primary structure is just a sequence of the amino acids. But then from there we can start thinking about how does it get shaped by thinking about the secondary structure.

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 …

Primary structure is just a sequence of the amino acids. But then from there we can start thinking about how does it get shaped by thinking about the secondary structure.

Introduction to proteins and amino acids Overview of protein structure Tertiary structure of proteins Orders of protein structure

The tertiary structure of a native conformation refers to the three dimensional organization of all the atoms—including side chain atoms—in a protein. Perhaps the best way to visualize what tertiary …

So that's the naming structure. And another kind of important naming structure you'll sometimes see is primary bronchus, secondary bronchus, and segmental, they call tertiary bronchus.

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With that high-level overview, I now want to think a little bit in more detail about how this actually happens, or the structure of things where this happens inside of a cell.