The Mudcat Café TM
Thread #109950 Message #2314003
Posted By: Padre
12-Apr-08 - 09:06 PM
Thread Name: (Dubiously) educational songs
Subject: RE: (Dubiously) educational songs
Try Harold Baum's 'The Biochemist's Songbook, with the likes of this:
*** The Michaelis Anthem *** (tune: The Red Flag)
The substrate changed by an enzyme
Initially, in unit time
Varies, if not in excess
With substrate concentration, [S]
If enzyme concentration's low
And reaction back from product's slow
Then if we choose a steady state
Velocity and [S] relate.
This relationship can be derived
As Briggs and Haldane first contrived:
The unbound enzyme, [E], we guess
Is [E0] (total), less [ES]
k1[S][E] gives [ES] formation
and k2[ES], dissociation
And [ES] gives the product, P,
At a rate that's [ES] times k3
When [ES] is at the steady state
These terms are all seen to relate
([E0] less [ES]) times k1[S]
Equals (k2 + k3) times [ES]
Now the maximum velocity
is k3[E0], (or big V)
These terms can be manipulated
If one more definition's stated
Define as Km (just for fun)
(k2 + k3) on k1
And note that v (velocity)
Is always [ES] times k3
Then rearranging these equations
We get the final rate equation
V times [S] on Km + [S]
is v (initial) - more or less