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Proteins.ppt
1.
© 2010 Pearson
Education, Inc. Chapter 6: Proteins and Amino Acids
2.
© 2010 Pearson
Education, Inc. What Are Proteins? Large molecules Made up of chains of amino acids Are found in every cell in the body Are involved in most of the body’s functions and life processes The sequence of amino acids is determined by DNA
3.
© 2010 Pearson
Education, Inc. Structure of Proteins Made up of chains of amino acids; classified by number of amino acids in a chain • Peptides: fewer than 50 amino acids - Dipeptides: 2 amino acids - Tripeptides: 3 amino acids - Polypeptides: more than 10 amino acids • Proteins: more than 50 amino acids - Typically 100 to 10,000 amino acids linked together Chains are synthesizes based on specific bodily DNA Amino acids are composed of carbon, hydrogen, oxygen, and nitrogen
4.
Structural Differences Between
Carbohydrates, Lipids, and Proteins Figure 6.1
5.
The Anatomy of
an Amino Acid Figure 6.2b
6.
© 2010 Pearson
Education, Inc. Peptide Bonds Link Amino Acids Form when the acid group (COOH) of one amino acid joins with the amine group (NH2) of a second amino acid Formed through condensation Broken through hydrolysis
7.
Condensation and Hydrolytic
Reactions Figure 6.3
8.
© 2010 Pearson
Education, Inc. Essential, Nonessential, and Conditional Essential – must be consumed in the diet Nonessential – can be synthesized in the body Conditionally essential – cannot be synthesized due to illness or lack of necessary precursors • Premature infants lack sufficient enzymes needed to create arginine
9.
10.
© 2010 Pearson
Education, Inc. Structure of the Protein Four levels of structure • Primary structure • Secondary structure • Tertiary structure • Quaternary structure Any alteration in the structure or sequencing changes the shape and function of the protein
11.
© 2010 Pearson
Education, Inc. Denaturing Alteration of the protein’s shape and thus functions through the use of • Heat • Acids • Bases • Salts • Mechanical agitation Primary structure is unchanged by denaturing
12.
Denaturing a Protein Figure
6.5
13.
© 2010 Pearson
Education, Inc. Quick Review Proteins are chains of combination of amino acids Amino acids contain carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur Unique amino acids consist of a central carbon with a carboxyl group, a hydrogen, a nitrogen-containing amine group, and a unique side chain There are 20 side chains and 20 unique amino acids • 9 essential amino acids • 11 nonessential amino acids - At time these become conditionally essential Amino acids link together with peptide bonds by condensation and break apart by hydrolysis
14.
© 2010 Pearson
Education, Inc. Quick Review Attractions and interactions between the side chains cause the proteins to fold into precise three-dimensional shapes Protein shape determines its function Proteins are denatured and their shapes changed by • Heat • Acids • Bases • Salts • Mechanical agitation
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