chapter04

chapter04 - BCH 4053Summer 2001Chapter 4 Lecture Notes...

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Chapter 4, Page 1 BCH 4053—Summer 2001—Chapter 4 Lecture Notes Slide 1 Chapter 4—Amino Acids The building blocks of proteins Slide 2 Amino Acid Structure Alpha amino acids-typical structure • See Figure 4.1 • Amide bond called peptide bond • See Figure 4.2 • Amino acids differ in R-group • Structures of the 20 common amino acids • See Figure 4.3 ( LEARN structures, names, and abbreviations!!) Slide 3 Amino Acid Stereochemistry • Natural amino acids are L • Configuration based on glyceraldehyde • Fischer projection convention: C H HO C O H CH 3 C OH H C O H CH3 L glyceraldehyde (l-glyceraldehyde) D glyceraldehyde (d-glyceraldehyde)
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Chapter 4, Page 2 Slide 4 Amino Acid Stereochemistry, con’t • Cahn, Ingold, Prelog System • R, S configuration ( Web site explanation ) • L glyceraldehyde is S • D glyceraldehyde is R • L alanine is S • See Figure Page 99 • All amino acids are S except: • Glycine (no chiral carbon) • Cysteine (why?) Slide 5 Amino Acids are Polyprotic • Neutral Side Chain (See Fig. 4.7) • Acidic Side Chain (See Fig. 4.8a) • Basic Side Chain (See Fig. 4.8b) Slide 6 pK’s of Amino Acid Groups
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This note was uploaded on 05/22/2011 for the course BCH 4053 taught by Professor Logan during the Fall '06 term at FSU.

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chapter04 - BCH 4053Summer 2001Chapter 4 Lecture Notes...

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