28_Proteins

28_Proteins - Proteins DNA helicase J. Lieb All amino acids...

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Proteins J. Lieb DNA helicase
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C H O H C R O N H H amino group -NH side chain carboxyl group -COOH α carbon All amino acids (peptides) have the same core structure Proteins (also called polypeptides) are formed from chains of linked amino acids.  The side chains give each amino acid it’s “personality”
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isoleucine ile I leucine leu L methionine met M valine val V CH 2 CH 2 CH 3 S HC CH 2 CH 3 CH 3 HC CH 2 CH 3 CH 3 HC CH 3 CH 3 The  hydrophobic  amino acids (non-aromatic) alanine ala A CH 3
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phenylalanine phe F tryptophan trp W These amino acids have an aromatic group CH 2 tyrosine tyr Y OH CH 2 CH 2 N The  hydrophobic  amino acids (aromatic)
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lysine lys K arginine arg R histidine his H The  basic   (positive charge) amino acids CH 2 CH 2 CH 2 CH 2 NH 3 + CH 2 CH 2 NH CH 2 NH 2 + NH 2 CH 2 CH 2 C N CH + HN C
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glutamic acid glu E C CH 2 O O CH 2 aspartic acid asp D C CH 2 O O The  acidic   (negative charge) amino acids
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asparagine asn N
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28_Proteins - Proteins DNA helicase J. Lieb All amino acids...

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