[RASMB] vbar of modified amino acids

[Richard M Thomas]

Assuming that your modifications are simply at the termini, the effect on 
vbar should be pretty small even for  relatively short peptides. 
Alternatively, it shouldn't be too difficult to use the additivity 
principle to calculate vbar for the modified constituents and to then use 
these to calculate the overall peptide vbar. There are various tables of 
group contributions - the one I have here is in 'Thermodynamic Data for 
Biochemistry and Biotechnology' (ed Hinz).
I will admit to simply adding in an extra glycine, on occasion, as an 
approximation for the N-Acetyl, C-Amide case, but don't tell anyone.

Regards to all
Richard

Dr Richard M Thomas
Institut für Polymere
ETH-Zentrum
CH-8092 Zürich
Switzerland
+41 1 632 5540
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