1 / 21

AMINO ACIDS

AMINO ACIDS. AMINO ACIDS. the R group varies. Naturally-occurring amino acids have L-configuration. ….. with only a very few having D-configuration. C. O. O. H. C. O. O. H. H. H. N. H. H. N. 2. 2. Amino Acids. D-. L-. R. R. naturally-occurring amino acids are

tangia
Download Presentation

AMINO ACIDS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. AMINO ACIDS

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

  3. C O O H C O O H H H N H H N 2 2 Amino Acids D- L- R R naturally-occurring amino acids are generally L-series

  4. 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

  5. SOME EXAMPLE AMINO ACIDS glycine - the only achiral amino acid R = H alanine R = CH3 R = CH(CH3)2 valine 20 different amino acids occur in proteins They differ by the R group

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

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

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

  9. THE ACIDIC AMINO ACIDS aspartic acid Asp glutamic acid Glu

  10. The Two Acidics

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

  12. The Three Basics

  13. Which of the following compounds is an -amino acid? • Only (a) • (a) and (b) • (a) and (c) • (a) and (d)

  14. Which of the following compounds is an -amino acid? • Only (a) • (a) and (b) • (a) and (c) • (a) and (d)

  15. Which of the following amino acids is achiral? • Alanine • Aspargine • Glycine • Threonine

  16. Which of the following amino acids is achiral? • Alanine • Aspargine • Glycine • Threonine

  17. The amino acid shown below has a side chain that is • acidic • basic • nonpolar • polar, neutral

  18. The amino acid shown below has a side chain that is • acidic • basic • nonpolar • polar, neutral

  19. 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

  20. 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

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

More Related