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Amino Acids/Biochemistry
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Amino Acids are the building block of
proteins
There are 20 commonly occurring amino acids.They have
the capacity to polymerize
varied structures
chemical functions in the amino acids chains
chirality
All amino acids except for proline have both
free α-amino and free α-carboxyl groups
Amino acids are classified as
non-polar or hydrophobic
neutral but polar amino acids
acidic amino acids
basic amino acids
Non polar amino acids. Include the amino acids with alkyl chain R groups
alanine
valine
leucine
isoleucine
proline (cyclic structure)
methionine (sulfur containing amino acid)
phenylalanine
tryptophan (aromatic)
Polar uncharged amino acids
contain R groups that can make H bonds with water (except for glycine)
are more soluble in water than hydrophobic amino acids
tyrosine has the lowest solubility in water
proline is very soluble in water
Good H-bond formation groups
amide group of asparagine and glutamine
hydroxyl group of tyrosine, threonine, and serine
sulfhydryl group of cystein
Glycine
has a single R group for H-bond formation
Acidic amino acids
aspartic acid and Glutamic acid
contain a carboxyl group in their R side chain
they exist as COO- in neutral pH
proteins with negatively charged aa bind to metal ions
carboxyl groups can act as nucleophile in enzyme reactions
Basic amino acids
histidine – imidazolium group
arginine – Guanidinium group
lysine – Protonated alkyl group
Author
stefanyoli787
ID
237588
Card Set
Amino Acids/Biochemistry
Description
Amino Acids Biochemistry
Updated
9/29/2013, 1:23:35 AM
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