/usr/share/gromacs/top/gmx.ff/aminoacids.n.tdb is in gromacs-data 4.5.5-2.
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 | [ None ]
[ NH3+ ]
[ replace ]
N NL 14.0067 0.129
CA CH1 13.019 0.127 0
[ add ]
3 4 H N CA C
H 1.008 0.248
[ delete ]
H
[ NH2 ]
[ replace ]
N NL 14.0067 -0.83
[ add ]
2 4 H N CA C
H 1.008 0.415
[ delete ]
H
[ PRO-NH2+ ]
[ replace ]
N NT 14.0067 0.2
[ add ]
2 4 H N CA C
H 1.008 0.4
[ PRO-NH ]
[ replace ]
N N 14.0067 -0.28
[ add ]
1 4 H N CA C
H 1.008 0.28
[ GLY-NH3+ ]
[ replace ]
N NL 14.0067 0.129
CA CH2 14.027 0.127 0
[ add ]
3 4 H N CA C
H 1.008 0.248
[ delete ]
H
|