AMBER Archive (2004)

Subject: AMBER: Does this warning matter? (about improper torsion parameters)

From: J. Zhang, Dr (jzhang_at_biophy.nju.edu.cn)
Date: Tue May 18 2004 - 22:04:32 CDT

Dear Amber users,

When I tried to create topology file by using tleap,
I found there are some warning in the leap.log file,
such as:
--------------------------------------------------------
Building proper torsion parameters.
Building improper torsion parameters.
 ** Warning: No sp2 improper torsion term for C*-CN-CB-CA
        atoms are: CG CE2 CD2 CE3
 ** Warning: No sp2 improper torsion term for NA-CA-CN-CB
        atoms are: NE1 CZ2 CE2 CD2
 ......

 ** Warning: No sp2 improper torsion term for C*-CN-CB-CA
        atoms are: CG CE2 CD2 CE3
 ** Warning: No sp2 improper torsion term for NA-CA-CN-CB
--------------------------------------------------------
Does these warnings matter? can I safely ignore them?

Thank you very much! 

---
J. Zhang, Dr
Institute of Biophysics
Nanjing University

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