Ch.5 Levels of Protein Structure

2*

Includes alpha helices and beta pleated sheets.

1*

The order of the amino acids

2* and 3*

Lost when a single polypeptide is denatured

4*

Describes overall shape of hemoglobin.

1*

Is encoded for by a gene.

3* + 4*

Results from the bonding of side chains

2*

Results from the hydrogen bonds forming in the backbone

4*

Is the overall 3D shape of a protein with multiple polypeptides

Primary Structure

is the sequence of amino acids in a polypeptide chain, determined by genetic information.

Secondary Structure

is the local folded structures that form within a polypeptide due to hydrogen bonding between backbone atoms.

Tertiary Structure

is the overall three-dimensional shape of a single polypeptide chain, resulting from interactions among side chains.

Quaternary Structure

is the complex formed by multiple polypeptide chains, which may include interactions between different proteins.