7.012 Lecture Notes - Lecture 3: Carboxylic Acid, Alpha And Beta Carbon, Peptide
Document Summary
However, reactions like this almost always require a catalyst, i. e. enzymes. Have carboxyl and amino groups they function as both acid and base. Under neutral ph, the carboxyl group discharges its proton. The alpha carbon atom in amino acids is asymmetrical. Amino acids bond together covalently by peptide bonds to form the polypeptide chain. Amino acids have different side chains denoted as r Some side chains effect the structure of the polypeptide backbone. There can be both polar and non polar side chains. Electrically charged side chains that are acidic have discharged a proton. Electrically charged side chains that are basic attract protons. Protein side chains can covalently bond to one another. Many side chains offer the ability to make a wide (essentially in nite) variety of proteins. Secondary structure general three-dimensional form of local segments of proteins. A parallel arrangement can form but it is much less stable than an anti-parallel arrangement.
