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OHS Amino Acids

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by

Nathan Johnson

on 21 April 2016

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Transcript of OHS Amino Acids

20 Different
Amino Acids

All amino acids have two groups in common: amino and carboxyl!
Amino acids are grouped according to common characteristics
Aromatic
Hydrocarbon
Acidic
Hydroxyl
Sulfur
Basic
Heterocyclic
Hydrophobic
Interactions: Dispersion and hydrophobic
Different side chains = variability in packing together
HYDROCARBON
Serine
Threonine
HYDROXYL
Polar group
Hydrophilic
Interactions: H-bond
Sulfur

Methionine starts all proteins!
Interactions: Cysteine disulfide bonds
Methionine
Cysteine
disulfide bonding
cysteine
very reactive,
often the active site of enzymes
Hydrophilic
Interactions: H-bonds
Different length side chains for variability
Note: these structures are shown as the salt form.... what would you call them?
ACIDIC
BASIC

Notice anything about these two
compared to the acidic amino acids?
Hydrophilic
Interactions: H-bonds
Same side chain with either
an acid group or an amine group!
ARO
ATIC
M
Hydrophobic
Contain a benzyl/phenyl group - Bulky
Tyr and Trp can H-bond (label partial charges!)
Useful to put reactive groups in a hydrophobic environment
HETEROCYCLIC
Contain a non-benzyl/phenyl ring
Trp is BOTH Aromatic and heterocyclic
Very large and reactive groups
Interactions: H-bonds
Proline wraps around to form a ring
with the amino group in the backbone.
Amino acids are coupled together using peptide bonds:
These are amide bonds!
Aspartic Acid
Glutamic Acid
Full transcript