PROTEINS

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PROTEINS
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Characteristics of Proteins

• Contain carbon, hydrogen, oxygen, nitrogen, and
  sulfur
• Serve as structural components of animals
• Serve as control molecules (enzymes)
• Serve as transport and messenger molecules
• Basic building block is the amino acid

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Amino Acid

• Amine group acts like a base, tends to be
  positive.
• Carboxyl group acts like an acid, tends to be
  negative.
• R group is variable, from 1 atom to 20.
• Two amino acids join together to form a
  dipeptide.
• Adjacent carboxyl and amino groups bond together.

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Some Amino Acids
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Some More Amino Acids
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Still More Amino Acids
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Formation of a Dipeptide
Dehydration synthesis
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Amino Acid Amino Acid --gt Dipeptide
Amino Acid Dipeptide --gt Tripeptide
A.A. A.A. .. Tripeptide --gt Polypeptide
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A protein consists of one or more polypeptide
chains.
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