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25 Cards in this Set
- Front
- Back
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(His)
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Histidine
-charged - basic -side chain may be positive or have no charge within physiological pH |
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(Gly)
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Glycine
-smallest amino acid -neutral -aliphatic -non-polar |
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(Ala)
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Alanine
-aliphatic -neutral -non-polar |
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(Val)
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Valine
-neutral -nonpolar -aliphatic |
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(Pro)
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Proline
-aliphatic branched -non-polar -neutral -side chain is bound to amine group |
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(Leu)
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Leucine
-aliphatic -neutral -non-polar |
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Neutral Amino Acids
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being neutral means that the amino acid has no charge at physiological pH
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(Ile)
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Isoleucine
-aliphatic -neutral -non-polar |
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(Phe)
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Phenylalanine
-aromatic -neutral |
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(Tyr)
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Tyrosine
-aromatic -neutral -OH gives slight polarity to R group |
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(Trp)
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Tryptophan
-aromatic -neutral |
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(Ser)
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Serine
-Polar -nuetral -hydroxyl makes it polar |
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(Thr)
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Threonine
-polar -neutral -contains -OH group |
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(Cys)
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Cysteine
-sulfur containing -neutral |
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(Met)
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Methionine
-sulfur containing -neutral |
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(Asn)
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Asparagine
-polar -contain amide in R group -neutral |
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(Asp)
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Aspartic acid
-polar -acidic |
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(Glu)
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Glutamic acid
-acidic -polar |
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Acidic Amino Acids
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-Aspartic Acid & Glutamic Acid
-have carboxyl group @ end of side chain -Ionization of -COOH group is pH dependent at physiological pH the group is negatively charged |
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(Lys)
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Lysine
-charged -basic -polar |
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(Arg)
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Arginine
-basic -polar |
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Basic Amino Acids
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Basic amino acids have nitrogen bases as part of the side chains
Ionization of these groups is pH dependent At physiological pH Lysine & Arginine side chains are positively charged: pI>9 Histidine side chain may be positive or have no charge @ physiological pH 6<pI<9 |
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Isoelectric point
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pH at which there is NO net charge on the molecule
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Ranges of pI
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pI's for acidic amino acids would be in acidic pH range
pI's for basic amino acids would be in alkaline pH range pI's for neutral amino acids are in neutral range 5<pI<7 |
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Histidine
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histidine side chains contribute to the buffering capacity of certain proteins in the body such as hemoglobin.
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