Amino Acids Flashcards
(20 cards)
Lysine
K
Lys
Pka= 10
Positively Charged at phys pH
Arginine
Arg
R
PKA=12
Positively charged
Guadidium group
Histidine
His
H
Pka ~6, depends on local environment
Can be positively charged, depends on local environment
Aspartic Acid (aspartate)
Asp
D
Negatively charged
Pka=4
Glutamic acid
Glu
E
Negatively charged
Pka=4
Serine
Ser
S
-OH group replaces one of h bonds in Me side chain
Polar uncharged
Threonine
Thr
T
OH group on first me group
Polar uncharged
Tyrosine
Y
Tyr
Phenylalanine but with OH group replacing one of Hs in benzene group
Polar, uncharged
Asparginine
Asn
N
Has an amide group
Polar, uncharged
Glutamine
Q
Gln
Has an amide group just like arginine but Glu is longer
Polar uncharged
Cysteine
Cys
C
Has a sulfur group that likes to form sulfide bonds in oxidized environments
Glycine
Gly
G
The only achiral amino acid
Good in turns because it’s so small.
Leucine
Leu
L
Large methyl group
Non polar
Alanine
Ala
A
Non polar
Just a methyl group
Methionine
Met
M
Inert sulfur group, hidden by hydrocarbons
Nonpolar
Isoleucine
Iso
I
Just like leucine but methyl on the second group
Nonpolar
Valine
Val
V
Makes a v shape.
Nonpolar uncharged
Phenylalanine
Phe
F
Alanine with a phenyl group
Tryptophan
Trp
W
Bulky rings, 2 of them
Proline
Pro
P
Good for rigidifying proteins
Forms imino groups with aa backbone (the amine part)
