shahrbanoo karbalaee wrote:

; Include Position restraint file
#ifdef POSRES
#include "posre.itp"
; Include water topology
#include "spce.itp"
Include tfe topology
#include "tfe.itp"

#endif


Well, there's the problem. You've enclosed the SPC/E and TFE .itp files within an #ifdef/#endif block, so they only get included with -DPOSRES. Move spce.itp and tfe.itp from within this block and things should work fine.

-Justin

#ifdef POSRES_WATER
; Position restraint for each water oxygen
[ position_restraints ]
;  i funct       fcx        fcy        fcz
   1    1       1000       1000       1000

#endif

; Include generic topology for ions
#include "ions.itp"

[ system ]
; Name
PEPTIDE A5 OR AUREIN 1.2 in 30%tfe  water

[ molecules ]
; Compound        #mols
Protein_A           1
SOL               941
tfe               301

---------------------------------------------------
 and the file tfe.gro is:

Glycine aRginine prOline Methionine Alanine Cystine Serine
    9
    1TFE    CC'    1  -0.098  -0.156   0.352
    1TFE    FD'    2  -0.010  -0.129   0.451
    1TFE    FE'    3  -0.143  -0.282   0.370
    1TFE    FF'    4  -0.203  -0.072   0.366
    1TFE    CB'    5  -0.033  -0.140   0.217
    1TFE   HB'1    6  -0.106  -0.161   0.139
    1TFE   HB'2    7   0.051  -0.209   0.209
    1TFE    O2'    8   0.014  -0.006   0.204
    1TFE    HO2    9   0.055   0.005   0.118
   0.00000   0.00000   0.00000


thanks and best regards

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

Justin A. Lemkul
Graduate Research Assistant
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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