/usr/share/gromacs/top/gromos45a3.ff/aminoacids.n.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 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | [ 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
[ bonds ]
N H1 gb_2
N H2 gb_2
N H3 gb_2
[ angles ]
H1 N H2 ga_9
H2 N H3 ga_9
H3 N H1 ga_9
CA N H1 ga_10
CA N H2 ga_10
CA N H3 ga_10
[ dihedrals ]
H1 N CA C gd_14
[ NH2 ]
[ replace ]
N NL 14.0067 -0.83
[ add ]
2 4 H N CA C
H 1.008 0.415
[ delete ]
H
[ bonds ]
N H1 gb_2
N H2 gb_2
[ angles ]
H1 N H2 ga_9
CA N H1 ga_10
CA N H2 ga_10
[ dihedrals ]
H1 N CA C gd_14
[ PRO-NH2+ ]
[ replace ]
N NT 14.0067 0.2
[ add ]
2 4 H N CA C
H 1.008 0.4
[ bonds ]
N H1 gb_2
N H2 gb_2
[ angles ]
H1 N H2 ga_9
CA N H1 ga_10
CA N H2 ga_10
CD N H1 ga_10
CD N H2 ga_10
[ dihedrals ]
H1 N CA C gd_14
[ PRO-NH ]
[ replace ]
N N 14.0067 -0.28
[ add ]
1 4 H N CA C
H 1.008 0.28
[ bonds ]
N H gb_2
[ angles ]
CA N H ga_10
CD N H ga_10
[ 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
[ bonds ]
N H1 gb_2
N H2 gb_2
N H3 gb_2
[ angles ]
H1 N H2 ga_9
H2 N H3 ga_9
H3 N H1 ga_9
CA N H1 ga_10
CA N H2 ga_10
CA N H3 ga_10
[ dihedrals ]
H1 N CA C gd_14
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