Proteins

Page
1

Slide 1

PROTEINS

Slide 2

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

Slide 3

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.

Slide 4

Some Amino Acids

Slide 5

Some More Amino Acids

Slide 6

Still More Amino Acids

Slide 7

Formation of a Dipeptide

Dehydration synthesis

Slide 8

Amino Acid + Amino Acid --> Dipeptide

Amino Acid + Dipeptide --> Tripeptide

A.A. + A.A. + … + Tripeptide --> Polypeptide

Slide 9

A protein consists of one or more

polypeptide chains.

Slide 10