Structure of proteins Flashcards
Module 3
What is the primary structure
amino acid sequence
what determines the properties of the protein
primary structure
what is the secondary structure
the folds such as helix and sheets
the function of a protein is determined by
3D structure
what is the tertiary structure
3D unique structure
what is quarternary structure
several units combine to form a protein with several polypeptide chains
Alpha helices are formed when
when the polypeptide strand folds around a central axis forming a regular, repeating helical structure
describe each repeating unit for the alpha helices include a) how many turns b) how long is the extension c)how many residues
a) single turn
b) 5.4 A along the axis
c) 3.6 residues
Is the helical twist of alpha helices in proteins left handed or right?
Right