Amine R group Alpha Carbon Carboxylic Acid. Nonpolar side chains.

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Presentation transcript:

Amine R group Alpha Carbon Carboxylic Acid

Nonpolar side chains

Polar side chains

Basic and Acidic side chains

Same Protein in acidic and basic environments

Isoelectric point, pI: Isoelectric point, pI: The pH at which an amino acid has no net charge: both equal + & - charges Isoelectric environment

Amide>>

By convention, peptides are written from the left, beginning with the free -NH 3 + group and ending with the free -COO - group on the right. C-terminal amino acid: C-terminal amino acid: the amino acid at the end of the chain having the free -COO - group. N-terminal amino acid: N-terminal amino acid: the amino acid at the end of the chain having the free -NH 3 + group.