I want to read out the partial charges of N terminus amino acid and C terminus amino acid. I checked with AMBER. It has N terminus amino acid files and C terminus amino acid files for all the parameters including partial charges. But it has only NH_3 terminus amino acid parameter files which include partial charges as well. But I need only for NH_2 terminus amino acid parameter. Similarly, I need to read out the partial charges for COOH terminus amino acid. However it has files containing only COO- terminnus amino acid. Kindly help where do I get the parameters for amino acid with N terminus (for NH_2 terminus ) and C terminus (CO-OH terminius alone).
Are you aware that amino acids usually exist preferentially in their zwitterionic form?
Also check https://www.bu.edu/aldolase/biochemistry/html_docs/Calculating_pI.ppt
Also check https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3622952/
Chinaza Godswill Awuchi and Michael G. Weller Thanks. But I am beginner to biochemistry and biophysics