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Additional
phenylalanine
English Wikipedia - The Free Encyclopedia
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Phenylalanine
Phenylalanine
(abbreviated as
Phe
or
F
) is an a-
amino acid
with the
formula
C
6
H
5
CH
2
CH(NH
2
)COOH. It can be viewed as a
benzyl
group
substituted
for the
methyl group
of
alanine
, or a
phenyl
group in place of a terminal hydrogen of alanine. This
essential amino acid
is classified as neutral, and
nonpolar
because of the inert and
hydrophobic
nature of the
benzyl
side chain. The
L
-isomer is used to biochemically form
proteins
, coded for by
DNA
. The
codons
for
L
-phenylalanine are UUU and UUC. Phenylalanine is a precursor for
tyrosine
, the
monoamine neurotransmitters
dopamine
,
norepinephrine
(noradrenaline), and
epinephrine
(adrenaline), and the skin
pigment
melanin
.
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