/usr/share/gromacs/top/gromos53a5.ff/aminoacids.c.tdb is in gromacs-data 2018.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | [ None ]
[ COO- ]
[ replace ]
C C C 12.011 0.27
O O1 OM 15.9994 -0.635
OXT O2 OM 15.9994 -0.635
[ add ]
2 8 O C CA N
OM 15.9994 -0.635
[ bonds ]
C O1 gb_6
C O2 gb_6
[ angles ]
O1 C O2 ga_38
CA C O1 ga_22
CA C O2 ga_22
[ dihedrals ]
N CA C O2 gd_40
[ impropers ]
C CA O2 O1 gi_1
[ COOH ]
[ replace ]
C C C 12.011 0.658
O O OA 15.9994 -0.611
OXT OT O 15.9994 -0.45
[ add ]
1 2 OT C CA N
O 15.9994 -0.45
1 2 HO O C CA
H 1.008 0.403
[ bonds ]
C O gb_13
C OT gb_5
O HO gb_1
[ angles ]
O C OT ga_33
C O HO ga_12
CA C O ga_19
CA C OT ga_30
[ dihedrals ]
N CA C O gd_40
CA C O HO gd_12
[ impropers ]
C CA OT O gi_1
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