Corey-Pauling rules

In biochemistry, the Corey-Pauling rules are a set of three basic statements that govern the secondary nature of proteins, in particular, the CO-NH peptide link. They were originally proposed by Robert Corey and Linus Pauling.

The rules are as follows:
 * 1) The atoms in a peptide link all lie on the same plane.
 * 2) The nitrogen, hydrogen, and oxygen atoms in a hydrogen bond are approximately in a straight line.
 * 3) The carbon-oxygen and nitrogen-hydrogen groups are all involved in bonding.