氨基酸 - 氨基酸密码子

In similar fashion, proteins that have to bind to positively charged molecules have surfaces rich with negatively charged amino acids like and , while proteins binding to negatively charged molecules have surfaces rich with positively charged chains like and.

The L and D convention for amino acid configuration refers not to the optical activity of the amino acid itself but rather to the optical activity of the isomer of from which that amino acid can, in theory, be synthesized D-glyceraldehyde is dextrorotatory; L-glyceraldehyde is levorotatory.