Chapter 3
Proteins—Amides at
Work
1
, Chapter Outline
3.1 Amino Acids —A Second Look
3.2 Protein Formation
3.3 The Three-Dimensional Structure of Proteins
3.4 Denaturation of Proteins
3.5 Examples of Biologically Important Proteins
Dr. Arika 2
, Introduction
• Amino acids are the building blocks of proteins,
which have structural and functional properties
in our bodies.
• Proteins function as follows:
– They transport oxygen in the blood.
– They are the primary components of skin and
muscle.
– They work as defense mechanisms against
infection.
– They serve as biological catalysts called
enzymes.
– They also control the metabolism of
hormones.
3
, Introduction, Continued
• Proteins are polymers of amino acids covalently
bonded in specific sequences.
• There are 20 commonly occurring amino acids
that make up proteins, and the order of amino
acids in proteins determines its structure and
biological function.
• When amino acids are covalently linked to one
another, this chain can twist and fold to form a
unique three-dimensional structure that has a
specific function.
4
Proteins—Amides at
Work
1
, Chapter Outline
3.1 Amino Acids —A Second Look
3.2 Protein Formation
3.3 The Three-Dimensional Structure of Proteins
3.4 Denaturation of Proteins
3.5 Examples of Biologically Important Proteins
Dr. Arika 2
, Introduction
• Amino acids are the building blocks of proteins,
which have structural and functional properties
in our bodies.
• Proteins function as follows:
– They transport oxygen in the blood.
– They are the primary components of skin and
muscle.
– They work as defense mechanisms against
infection.
– They serve as biological catalysts called
enzymes.
– They also control the metabolism of
hormones.
3
, Introduction, Continued
• Proteins are polymers of amino acids covalently
bonded in specific sequences.
• There are 20 commonly occurring amino acids
that make up proteins, and the order of amino
acids in proteins determines its structure and
biological function.
• When amino acids are covalently linked to one
another, this chain can twist and fold to form a
unique three-dimensional structure that has a
specific function.
4
