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AMINO ACIDS
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AMINO ACIDS the R group varies
Naturally-occurring amino acids have L-configuration ….. with only a very few having D-configuration
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Amino Acids C O H N R R D- L- naturally-occurring amino acids are
2 D- L- R R naturally-occurring amino acids are generally L-series
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SOME EXAMPLE AMINO ACIDS
glycine - the only achiral amino acid R = H alanine R = CH3 valine R = CH(CH3)2 20 different ones occur in proteins
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SOME EXAMPLE AMINO ACIDS
glycine - the only achiral amino acid R = H alanine R = CH3 valine R = CH(CH3)2 20 different amino acids occur in proteins They differ by the R group
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NON-POLAR POLAR AMINO ACIDS NEUTRAL ACIDIC BASIC
THE 20 COMMON AMINO ACIDS Amino acids are classified by their R group NON-POLAR POLAR AMINO ACIDS NEUTRAL ACIDIC BASIC
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THE 9 NON-POLAR AMINO ACIDS
Glycine Gly Alanine Ala Valine* Val Leucine* Leu Methionine* Met Tryptophan* Trp Proline Pro Phenylalanine* Phe Isoleucine* Ile * Essential amino acids
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THE 6 NEUTRAL POLAR AMINO ACIDS
serine Threonine* Thr Tyrosine Tyr Cysteine Cys Asparagine Asn Glutamine Gln * Essential amino acid
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THE ACIDIC AMINO ACIDS aspartic acid Asp glutamic acid Glu
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The Two Acidics
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THE BASIC AMINO ACIDS Histidine* His Lysine* Lys Arginine* Arg
* Essential amino acids
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The Three Basics
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Which of the following compounds is an -amino acid?
Only (a) (a) and (b) (a) and (c) (a) and (d)
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Which of the following compounds is an -amino acid?
Only (a) (a) and (b) (a) and (c) (a) and (d)
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Which of the following amino acids is achiral?
Alanine Aspargine Glycine Threonine
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Which of the following amino acids is achiral?
Alanine Aspargine Glycine Threonine
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The amino acid shown below has a side chain that is
acidic basic nonpolar polar, neutral
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The amino acid shown below has a side chain that is
acidic basic nonpolar polar, neutral
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Which of the following amino acids can form hydrogen bonds between their side-chain groups?
Alanine and glycine Alanine and aspargine Aspargine and threonine Glycine and threonine
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Which of the following amino acids can form hydrogen bonds between their side-chain groups?
Alanine and glycine Alanine and aspargine Aspargine and threonine Glycine and threonine
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Unusual L-Amino Acids Found in Proteins
Fig. 3-8a
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