A is for...

[guineazilla]

Yes! M is for Methionylthreonylthreonylglutaminylala…
ylglutaminylprolylleucylglutaminylsery…
lserylthreonylalanylthreonylphenylalan…
rylglycylphenylalanylprolylvalylprolyl…
lanylarginylaspartylglycylglutaminylva…
nylleucylprolylglycylvalylglutaminylis…
ylglycylarginylalanyllysylleucylthreon…
llysylalanylasparaginylserylglycylargi…
eonylasparaginylglycylserylglycylgluta…
nylglutamylleucylleucylvalyllysylalany…
asparaginylphenylalanylvalylglutaminyl…
ylthreonylvalylarginylglutaminylglycyl…
utaminylvalylarginylvalylthreonylglycy…
lylvalyllysylphenylalanyltyrosylarginy…
cylglutaminylserylserylleucylaspartylp…
glutaminylglutamylglycylaspartylleucyl…
anylglutamylalanyltyrosylprolylglutamy…
serylvalylasparaginylalanylthreonylasp…
ylthreonylserylthreonylalanylglutamyll…
tamylglutamylglutamylvalylprolylalanyl…
eucylvalylserylthreonylalanylglutaminy…
glutaminylthreonylarginylisoleucylglut…
ylhistidylphenylalanylaspartylalanylar…
lylglutamylmethionylvalylisoleucylaspa…
nylglutaminylleucylprolylhistidyllysyl…
lprolylprolyllysylprolyllysylserylargi…
erylisoleucylalanylalanyllysylalanylgl…
ylglutaminylserylprolylserylprolylisol…
lprolylvalylarginylhistidylvalylarginy…
lylvalylarginylserylvalylserylprolylal…
onylserylprolylisoleucylarginylserylva…
thionylarginyllysylthreonylglutaminyla…
ylglycylprolylglutamylvalylprolylproly…
tamylglycyltyrosylvalylalanylserylsery…
ylarginylglutamylthreonylthreonylleucy…
minylisoleucylarginylthreonylglutamylg…
cylarginyltyrosylglycylvalylglutaminyl…
eucylserylglycylalanylalanylglycylalan....
And yes, its a real word, the longest word, and only part of it
I will post the last letter

[Slengar]

N is for novercaphobia

[guineazilla]

O is for OPTIONAL

[Slengar]

P is for penis paint o.O

[guineazilla]

Q is for QUARTZ

[Slengar]

R is for retards Rain

[guineazilla]

S is for SATURDAY

[highlander]

T IS FOR...TRANSCEND.

[Slengar]

U is for Uruguay

[guineazilla]

V is for VIOLIN