IUBio

Catalysts and chemical equilibrium (reply to Lukasz)

Pentcho Valev RUMYM at BGEARN.ACAD.BG
Sat Jan 31 04:57:04 EST 1998


Lucasz Salwinski wrote:>>>>>>>>>>>>>>>>>>>>
it was pretty clear form Athel's post no change of equilibrium constant is
possible.
but if you've got problems with your equqtions:

>Let us assume that what the second law says is correct, that the equilibrium
>concentrations have remained the same and that, for simplicity, the rate of
                                                 ^^^^^^^^^^^^^^

                                                 this simplification is not
valid and
                                                 leads to utter nonsense that
followed

>the catalyzed forward reaction is determined by the first step - bonding of
>A to E. Then
>
>     V+ = K+(A)(E) = K-(C)(E) = V-                                   /2/

why not valid ? - because in /2/ (B) suddenly disappeared. so according to
/2/ concentration of B can changed to anything. then, according to /2/
equilibrium
concentrations of A and C should not change. utter nonsense.<<<<<<<<<<

So you claim that the rate of the enzyme reaction

       A + B + E  ->

cannot be described by

       V+ = K+(E)(A)

Utter nonsense? Lukasz, what are you talking about?

Best regards,
Pentcho



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