/usr/share/gromacs/top/gromos53a6.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 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 96 97 98 | [ 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_10
H2 N H3 ga_10
H3 N H1 ga_10
CA N H1 ga_11
CA N H2 ga_11
CA N H3 ga_11
[ dihedrals ]
H1 N CA C gd_29
[ NH2 ]
[ replace ]
N NL 14.0067 -0.66
CA CH1 13.019 -0.22 0
[ add ]
2 4 H N CA C
H 1.008 0.44
[ delete ]
H
[ bonds ]
N H1 gb_2
N H2 gb_2
[ angles ]
H1 N H2 ga_10
CA N H1 ga_11
CA N H2 ga_11
[ dihedrals ]
H1 N CA C gd_29
[ PRO-NH2+ ]
[ replace ]
N NT 14.0067 0.128
CA CH1 13.019 0.188
CD CH2r 14.027 0.188
[ add ]
2 4 H N CA C
H 1.008 0.248
[ bonds ]
N H1 gb_2
N H2 gb_2
[ angles ]
H1 N H2 ga_10
CA N H1 ga_11
CA N H2 ga_11
CD N H1 ga_11
CD N H2 ga_11
[ dihedrals ]
H1 N CA C gd_29
[ PRO-NH ]
[ replace ]
N N 14.0067 -0.31
[ add ]
1 4 H N CA C
H 1.008 0.31
[ bonds ]
N H gb_2
[ angles ]
CA N H ga_11
CD N H ga_11
[ 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_10
H2 N H3 ga_10
H3 N H1 ga_10
CA N H1 ga_11
CA N H2 ga_11
CA N H3 ga_11
[ dihedrals ]
H1 N CA C gd_29
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