Chapter 4 - Proteins

Chapter 4 - Proteins - Proteins Levels of protein structure...

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Proteins Levels of protein structure - Diversity of proteins comes from: o Sequence possibilities o Folding of the peptide chain - Primary structure (1 st degree), secondary structure, tertiary structure (3 rd degree), quaternary structure (4 th structure) Primary structure - The sequence of amino acids in a protein - Information in a gene encodes primary structure (direct relationship b/n genetics and protein structure) - Higher levels of structure are dependent on primary structure o Primary level of information indirectly determines all lower levels of structure (which amino acids are included and in what order) o Sequence of amino acids determines secondary and tertiary structure Peptide bonds keep the primary structure together and intact Secondary protein structure - Characteristic arrangement of the peptide backbone (not R groups) - Two common forms of 2 nd structure o Alpha-helix: coiled structure Produces relatively rigid rods o Beta-sheets: parallel arrays of backbone
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Produces planar sheets, like a tabletop
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Chapter 4 - Proteins - Proteins Levels of protein structure...

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