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MBB222-lecture5 %5bCompatibility Mode%5d

MBB222-lecture5 %5bCompatibility Mode%5d - Proteins Vary...

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Unformatted text preview: Proteins Vary Greatly in Size, Shape, and Function • proteins can be grouped into several broad, functional categories – structural proteins: provide structural rigidity to the cell – transport proteins: control passage of substances across cell membranes – regulatory proteins: act as sensors/switches to control protein activity/gene function – signaling proteins: transmit external signals inside the cell – motor proteins: produce movement Proteins: • polymers of 20 different amino acids • characteristic structure: – a central C atom (C α ) bound to 4 different chemical groups » an amino group (NH 2 ) » a carboxyl group (COOH) » a H atom » a variable group ( side chain or R group ) • α carbon of all amino acids (except glycine) is asymmetric – exist as stereoisomers (D and L forms) – usually only the L forms are found in proteins Stereoisomeric Amino Acid Structures • chemical properties are the same, yet biological activities are distinct • to understand proteins, you must understand the amino acids...
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MBB222-lecture5 %5bCompatibility Mode%5d - Proteins Vary...

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