Structure of Proteins. UNIT I: Protein Structure and Function. I. Overview. The 20 common aa’s joined by peptide bonds Linear sequence of linked aa’s info. to generate a protein molecule with a unique 3D
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Protein Structure and Function
Figure 2.2-A. Formation of a peptide bond, showing the structure of the dipeptide valylalanine.
Determination of the amino acid composition of a
polypeptide using an amino acid analyzer.
Figure 2.7. A. Structure of a β-sheet.
B. An anti-parallel β-sheet
with the β-strands represented as broad arrows.
2.Parallel and antiparallel sheets
Formation of a disulfide bond by the oxidation of two cysteine residues, producing one cystine residue.
Hydrophobic interactions between amino acids with non-polar side chains.
Location of nonpolar amino acids in soluble and membrane proteins.
Interactions of side chains of amino acids through hydrogen bonds and ionic bonds.
Hydrogen bond between the phenolic hydroxyl group of tyrosine and another molecule containing a carbonyl group.
One proposed mechanism for multiplication of infectious prion agents.