BIOCHEM 523 Lecture Notes - Lecture 5: Stereochemistry, Fischer Projection, Cystine
3 Oct 2017
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Biochem423/523 - lecture 5 - amino acids and structure. A zwitterion is the form that these molecules are written in, as shown below. L vs. d stereochemistry bonds project into the page. In a fischer projection, the horizontal bonds project out of the page and the vertical. Enantiomers are molecules with mirror image stereochemistry. All amino acids except glycine can have l and d stereochemistry. When the amino group (up) and hydroxy group (down) are vertical in a fischer projection, The l-amino acid means the r group is on the left. The d-amino acid means the r group is on the right. Isoleucine and threonine have an additional stereocenter at the beta carbon. Most innate proteins occur in the l-form, but some d-form amino acids are found in large. Asymmetry in the surface of a protein enables highly specific molecular recognition of.
