phosphopeptide pI and Mr calculation

Evangelos Christodoulou echristo at
Tue Oct 12 03:40:55 EST 1999

In article <7tud7i$1luk$1 at> , "PAUL  MACLEAN"
<PM.MACLEAN at> wrote:

> Does anyone know an internet resource that will calculate pI and Mr of
> phosphorylated peptides?
> If not, does anyone know the relative pKa's  of the two hydrates oxygen
> molecules of an attached phosphate?  I can calculate the pI and Mr by hand
> if needs be, but I need this information to do so.
> Can anyone point me in the right direction? I've checked Pedro's
> biomolecular tools.  Most programs I have found do not handle
> posttranslationally altered amino acids in their pI calculation.
> Thank you,
> Paul MacLean
For the pI:

For the pKa:

Hope this helps.

Evangelos Christodoulou
University of Athens, Greece
If Che Guevara was alive he'd use a Mac
-the only revolutionary-friendly platform

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