proteins - Chap 16 Proteins Protein from the Greek proteios...

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1 Chap 16 Proteins Protein from the Greek “proteios” = first Proteins are made up of 20 amino acids. Proteins form enzymes. Ex. Insulin = 5,700 molar mass Hemoglobin = 64,000 Table 16.1 1. Amino acids- A. Structure- a -amino acid R = a) non-polar or polar group. Hydrophobic or hydrophilic. b) acidic or basic. B. 20 amino acids- 10 are synthesized by the body 10 are provided by diet (essential). H N C OH O R H
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2 Ionization- C. Peptide bond- amide bond between two amino acids. D. Peptide has a carboxl and an amine end. E. 1 and 2 structure. 1 structure- the sequence of AA linked together. ASP-Glu-Ser 2 structure- the way amino acids are arranged in space. H 3 N OH O R + low pH H 3 N O - O R + med pH Zwitterion (neutral) H 2 N O - O R high pH H 2 N C C N H C C H N C C OH O CH 2 Ph CH 3 O CH 2 OH O phenylalanine alanine serine H 2 N OH O R + H 2 N OH O R' H 2 N N H O R OH O R' peptide bond
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3 1) alpha helix. H-bond between each N-H and C=O groups. 2) Beta-pleated sheets- sheets are held side by side by H-bond. Makes fibrous proteins like silk that can stack close together. Have small R groups in abundance like glycine, alanine serine.
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This note was uploaded on 09/02/2011 for the course CHEM 30b taught by Professor Harrison during the Spring '11 term at West Valley.

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proteins - Chap 16 Proteins Protein from the Greek proteios...

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