aguilaroja
Member
- Joined
- Jul 24, 2013
- Messages
- 850
...
And this makes me want to rant about the Breslow Mechanism.
....false paradigms can have inertia;
...Authoritarianism plays an important role; especially when considering things that cannot even be seen directly – like molecules. Explanations printed in the shiniest books are usually considered to be the truth.
A. J. Knell's PhD 1970 dissertation† provides a 144-page β-slap of the Breslow mechanism of how exactly this enzyme works – how thiamine removes carbon dioxide from pyruvate.
...And he goes into great detail on all of his points.
The Breslow Mechanism in rarely drawn with the entire thiamine molecule. This is done partly to save space and time; but also, the rest of the thiamine molecule actually gets in the way if you try to do this. Knell mentioned in point (a) that it was impossible to build models – It's hard to even draw...
And you would think that Breslow intermediate #3 would be practically irreversible
...So this intermediate might not have ever been made, anywhere. Not even inside the enzyme.
....Another nice thing about this is that you have an S-linked acetyl group, which how they are usually shuttled around in the body by coenzyme A.
Thanks for this discussion. The thread is going in many directions....
As thiamine's significance has been discussed in many posts, this is a big point, in addition to the lesson about insidious dogma.
This account is delightfully expressed.