2009-09-04_-_Lecture_2

2009-09-04_-_Lecture_2 - Biochemistry 461 FS 2009 Michigan...

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Biochemistry 461 FS 2009 Michigan State University Amino Acids and Peptides September 4, 2009 Lecture 2 What is the pH of a buffer prepared from 0.1 M sodium acetate and 0.04 M acetic acid? Buffer Example (from previous lecture) 2
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• Amino acids are the building blocks of proteins. • General structure: a central carbon atom ( alpha carbon ) with substituents: --a primary amino group, NH 3 + ; --a carboxylic acid, COO - ; --a hydrogen atom; and --a side chain (R group) that gives the particular amino acid its identity. Zwitterion : Molecule bearing groups with opposite charge. Amino Acids – The Basics 3 Because the amino acids, except for glycine (R = H), have four different substituents around a tetrahedral carbon, termed a chiral center , they can exist in two possible configurations in three dimensions ( stereoisomers ). All biological amino acids exist as the “L” isomer. (Don’t worry about why one is called “D” and the other “L”) Amino Acids – Stereochemistry 4
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Amino Acids Are Chiral • The amino acids D -alanine and L -alanine are mirror images • They are NOT the same compound
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2009-09-04_-_Lecture_2 - Biochemistry 461 FS 2009 Michigan...

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