CISP peptide bond

Jamie Fletcher J.Fletcher at
Tue Jan 28 23:01:02 EST 1997

I am trying create a .psf file containing a cis peptide bond using the CISP
patch (with the latest toph19.pep and files from Michael
Nilges' group) in X-PLOR 3.1 as follows...

 patch cisp
   reference=-=( resid 10 )
   reference=+=( resid 11 )

...however I keep getting the error message...

%PATCH-ERR: improper +HN   +N    -C    -CA   not found
%PATCH-ERR: improper +N    +HN   -C    -CA   not found

Does anyone know what might be causing this problem?

Thank you in advance for any help,
yours sincerley, Jamie Fletcher

Jamie Fletcher
Department of Biochemistry   Tel: [61-2]-9351-6025
University of Sydney         Fax: [61-2]-9351-4726
N.S.W. 2006                  E-mail: J.Fletcher at

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