AMINO ACIDS AMINO ACIDS the R group varies

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AMINO ACIDS

AMINO ACIDS

AMINO ACIDS the R group varies Naturally-occurring amino acids have L-configuration …. . with

AMINO ACIDS the R group varies Naturally-occurring amino acids have L-configuration …. . with only a very few having D-configuration

Amino Acids COOH H R COOH NH 2 H 2 N D- L- H

Amino Acids COOH H R COOH NH 2 H 2 N D- L- H R naturally-occurring amino acids are generally L-series

SOME EXAMPLE AMINO ACIDS glycine - the only achiral amino acid R=H alanine R

SOME EXAMPLE AMINO ACIDS glycine - the only achiral amino acid R=H alanine R = CH 3 valine R = CH(CH 3)2 20 different ones occur in proteins

SOME EXAMPLE AMINO ACIDS glycine - the only achiral amino acid R=H alanine R

SOME EXAMPLE AMINO ACIDS glycine - the only achiral amino acid R=H alanine R = CH 3 valine R = CH(CH 3)2 20 different amino acids occur in proteins They differ by the R group

THE 20 COMMON AMINO ACIDS Amino acids are classified by their R group NON-POLAR

THE 20 COMMON AMINO ACIDS Amino acids are classified by their R group NON-POLAR AMINO ACIDS • NEUTRAL • ACIDIC • BASIC

THE 9 NON-POLAR AMINO ACIDS Glycine Gly Alanine Ala Proline Isoleucine* Pro Ile *

THE 9 NON-POLAR AMINO ACIDS Glycine Gly Alanine Ala Proline Isoleucine* Pro Ile * Essential amino acids Valine* Val Phenylalanine* Phe Tryptophan* Trp Leucine* Leu Methionine* Met

THE 6 NEUTRAL POLAR AMINO ACIDS serine Threonine* Thr Tyrosine Tyr Asparagine Asn *

THE 6 NEUTRAL POLAR AMINO ACIDS serine Threonine* Thr Tyrosine Tyr Asparagine Asn * Essential amino acid Glutamine Gln Cysteine Cys

THE ACIDIC AMINO ACIDS aspartic acid Asp glutamic acid Glu

THE ACIDIC AMINO ACIDS aspartic acid Asp glutamic acid Glu

The Two Acidics

The Two Acidics

THE BASIC AMINO ACIDS Lysine* Lys * Essential amino acids Arginine* Arg Histidine* His

THE BASIC AMINO ACIDS Lysine* Lys * Essential amino acids Arginine* Arg Histidine* His

The Three Basics

The Three Basics

Which of the following compounds is an -amino acid? 1. 2. 3. 4. Only

Which of the following compounds is an -amino acid? 1. 2. 3. 4. Only (a) and (b) (a) and (c) (a) and (d)

Which of the following compounds is an -amino acid? 1. 2. 3. 4. Only

Which of the following compounds is an -amino acid? 1. 2. 3. 4. Only (a) and (b) (a) and (c) (a) and (d)

Which of the following amino acids is achiral? 1. 2. 3. 4. Alanine Aspargine

Which of the following amino acids is achiral? 1. 2. 3. 4. Alanine Aspargine Glycine Threonine

Which of the following amino acids is achiral? 1. 2. 3. 4. Alanine Aspargine

Which of the following amino acids is achiral? 1. 2. 3. 4. Alanine Aspargine Glycine Threonine

The amino acid shown below has a side chain that is 1. 2. 3.

The amino acid shown below has a side chain that is 1. 2. 3. 4. acidic basic nonpolar, neutral

The amino acid shown below has a side chain that is 1. 2. 3.

The amino acid shown below has a side chain that is 1. 2. 3. 4. acidic basic nonpolar, neutral

Which of the following amino acids can form hydrogen bonds between their side-chain groups?

Which of the following amino acids can form hydrogen bonds between their side-chain groups? 1. Alanine and glycine 2. Alanine and aspargine 3. Aspargine and threonine 4. Glycine and threonine

Which of the following amino acids can form hydrogen bonds between their side-chain groups?

Which of the following amino acids can form hydrogen bonds between their side-chain groups? 1. Alanine and glycine 2. Alanine and aspargine 3. Aspargine and threonine 4. Glycine and threonine

Unusual L-Amino Acids Found in Proteins Fig. 3 -8 a

Unusual L-Amino Acids Found in Proteins Fig. 3 -8 a