PROTEINS.

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The Structure of Proteins

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Presentation transcript:

PROTEINS

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

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.

Some Amino Acids

Some More Amino Acids

Still More Amino Acids

Formation of a Dipeptide Dehydration synthesis

Amino Acid + Amino Acid --> Dipeptide Amino Acid + Dipeptide --> Tripeptide A.A. + A.A. + …..+ Tripeptide --> Polypeptide

Protein Folding Primary – chain form Secondary- sheet form Tertiary- condensed sheet Quaternary- solid form of overlapping Chains of proteins, this is the large form That make up structures in the body Such as muscles.