Lecture 1: Chemistry of Food Proteins
Lesson 2
1.
Amino acids as building blocks of proteins
Are organic polymers composed of amino acids as the basic units.
Amino acids: a carboxylic acid group (-COOF) and an amino group (-NH2)
2.
Essential amino acids
There are 9 essential
amino acids that our body’s cant synthesize in amounts to
meet body’s needs
3.
Protein structure: primary, secondary, tertiary, quaternary
Amino acids join together in peptide bonds.
The sequence of amino acids is
known as the primary structure
Secondary structure
is the way in which different parts of the polypeptide chain
link together.
Tertiary structure
folding of the protein into a 3-dimensional
shape.
Quaternary structure
forms a larger functional unit by interactions between
separate polypeptide chains.
4.
Why is protein important?
Growth and repair of cell and tissue.
Mechanical work.
Disease prevention.
Controlling body processes (enzymes, hormones, buffers).
Transport functions.
Source of energy and glucose.
5.
Test your knowledge:
•
Match each term with the appropriate definition:
1.
Primary structure
A. helices and pleated sheets
2.
Secondary structure
B. sequence of amino acids in a protein
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- Spring '10
- Horowitz
- Amino Acids, PKU, essential amino acids
-
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