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Amino Acids

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2. Modified amino acids are neurotransmitters, etc. ... tidbit: avg mol wt 110. Amino Acid Properties. name and 3 letter abbreviation of all 20 ... – PowerPoint PPT presentation

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Title: Amino Acids


1
Amino Acids
2
Functions of Amino Acids
  • 1. Building blocks of proteins
  • 2. Modified amino acids are neurotransmitters,
    etc.

3
Defined by Structure
  • Standard amino acids are a-amino carboxylic acids

4
Stereochemistry
  • Naturally occurring amino acids are L-amino acids

5
Classification of Amino Acids
  • Polarity
  • functional group
  • acidic, basic or neutral

6
Amino Acids are Charged at Physiological pH
  • Zwitterion- and - regions net charge 0

7
Amino Acid Properties
  • Ionic- high mp, \ solid at room temp
  • very water soluble
  • tidbit avg mol wt 110

8
Amino Acid Structures
  • name and 3 letter abbreviation of all 20
  • at phys pH

9
Acid-base Chemistry
  • R group dissociates in same manner
  • Consider neutral, basic, acidic

10
Neutral Amino Acid all but 5
  • R group dissociates in same manner
  • Consider pH 1, pH pKcarboxy, pH pI, pH
    pKamino, pH 13

11
Other Amino Acid Chemistry
  • Lab reactions ninhydrin and FDNB
  • modified amino acids
  • peptide bond formation

12
Peptides
  • Dipeptide
  • Nomenclature

13
Peptide Chemistry
  • peptide bond cleavage
  • acid or base
  • some aa destroyed
  • acid-base chemistry- R groups only
  • pK data
  • net charge used
  • physiological activity
  • almost unlimited examples
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