rama david wrote:
Hi Gromacs friends,

When I given the command ...
pdb2gmx -f .. -o .. -p .. -ignh
I gate the following error..

------------------------------------------------------
Program pdb2gmx, VERSION 4.5.4
Source code file: /build/buildd/gromacs-4.5.4/src/kernel/pdb2top.c, line: 1070

Fatal error:
atom N not found in buiding block 1ACE while combining tdb and rtp
For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors
When I goes through the detail of the website at http://www.gromacs.org/Documentation/Errors and document
I come to know that I have to modify the rtp file,

Nowhere in the explanation of the error does it suggest that you should alter the .rtp file in this instance. You have atoms in your structure that are not in the .rtp entry. Specifically, your structure file has an N atom in ACE, but ACE only contains CA, C, and O. The N atom should be the first atom in the next residue, not ACE.

-Justin

--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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