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Biology 101

CH 3 2 of 4 Describe the different levels of structure for proteins.

TermDefinition
The hierarchy of four levels: Primary, secondary, tertiary, and quaternary.
Primary structure: Amino acid sequence: Is a protein is its amino acid sequence. because the R groups that distinguish the amino acids paly no role in the peptide backbone of proteins, a protein can consist of any sequence of amino acids.
This important property of proteins permits great diversity: Primary structure
Secondary structure: Hydrogen bonding patterns: The amino acid side groups are not the only portions of proteins that form hydrogen bonds. The peptide groups of the main chain can also do so. These hydrogen bonds can be with water or with other peptide groups
Peptide Backbone Secondary structure: These two kinds of secondary structure create regions of the protein that are cylindrical and planar. A protein's final structure can include regions of each type of secondary structure.
Teritary structure Folds and links: The final folded shape of a globular protein. It contains regions that have secondary structure and determines how these are further arranged in space to produce the overall structure.
The stability of a protein, once it has folded into its ____________ shape, is strongly influenced by how well its interior fits together. Teritary structure
Quaternary structure Subunit arrangements: When two ro more polypeptide chains associate to fom a functional protein, the individual chains are referred to as subuits of the protein.
Proteins composed of subunits, the interfaces where the subunits touch one another are often nonpolar, and they paly a key role in transmitting information between the subunits about individual subunit activities. Quaternary structure
Created by: usn3gen
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