Chapter 4 part 1 - Chapter4...

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Chapter 4 Protein 3-Dimensional Structure and Function
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Terminology Conformation – spatial arrangement of atoms in a  protein Native conformation – conformation of functional  protein
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Protein Classification Simple – composed only of amino acid residues Conjugated – contain prosthetic groups (metal ions, co-factors, lipids, carbohydrates) Example: Hemoglobin – Heme
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Protein Classification One polypeptide chain - monomeric protein More than one - multimeric protein Homomultimer - one kind of chain Heteromultimer - two or more different chains (e.g. Hemoglobin is a heterotetramer. It has two alpha chains and two beta chains.)
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Protein Classification Fibrous – 1) polypeptides arranged in long strands or sheets 2) water insoluble (lots of hydrophobic AA’s) 3) strong but flexible 4) Structural (keratin, collagen) Globular polypeptide chains folded into spherical or globular form water soluble contain several types of secondary structure diverse functions (enzymes, regulatory proteins)
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keratin collagen catalase
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Protein Function Catalysis – enzymes Structural – keratin Transport – hemoglobin
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This note was uploaded on 10/03/2010 for the course CHEM 527 taught by Professor Starnes,s during the Fall '08 term at Texas A&M University–Commerce.

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Chapter 4 part 1 - Chapter4...

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