Enzymes

[ivslt247]

i know its a day before the exam  but i've been confused by many people...are enzymes tertiary or quaternary structures?
like if a multiple choic,e question came along asking primary secondarry tertiaary or quaternary which one would it be?
some people says its tertiary..i think its quaternary at the moment.. please help! ><

[The Detective]

I think enzymes can be tertiary or quaternary? Most of them are tertiary though...

[TrueLight]

they can be either

i just googled it
eg:
RuBisCO has a quaternary structure
pyruvate kinase has a quaternary structure
Lactate Dehydrogenase has a quaternary structure
Glutamine Synthetase has a quaternary structure
F1 ATPase has a quaternary structure

[ivslt247]

what would you guys do if it was on the exam?

[ivslt247]

ah ok thanks for the inputs guys. much appreciated

[shinny]

Sounds like a bit of a misunderstanding really. The primary, secondary etc. are a way of classifying certain levels in the structure of proteins. You don't say an enzyme is either a tertiary or quaternary enzyme; you're just speaking about the tertiary or quaternary structure of a protein, which in this case happens to be an enzyme. An enzyme still has a primary and secondary structure.

[TrueLight]

yep i think someone on here spoke about it as a level of magnification, which was a good analogy

but im sure there has to be an enzyme with one folded polypeptide chain

maybe these one

Yeast Glyoxalase I
http://www.jbc.org/content/276/3/1845.abstract

Glucokinase
galactose oxidase
Phospholipase A2