/usr/share/gromacs/top/charmm27.ff/dna.hdb 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 | DA 8
2 6 H5' C5' O5' C4'
1 5 H4' C4' C5' O4' C3'
1 5 H1' C1' O4' N9 C2'
1 1 H8 C8 N9 N7
2 3 H6 N6 C6 C5
1 1 H2 C2 N1 N3
1 5 H3' C3' C4' C2' O3'
2 6 H2' C2' C1' C3'
DT 8
2 6 H5' C5' O5' C4'
1 5 H4' C4' C5' O4' C3'
1 5 H1' C1' O4' N1 C2'
1 1 H6 C6 N1 C5
3 4 H5 C5M C5 C6
1 1 H3 N3 C4 C2
1 5 H3' C3' C4' C2' O3'
2 6 H2' C2' C1' C3'
DG 8
2 6 H5' C5' O5' C4'
1 5 H4' C4' C5' O4' C3'
1 5 H1' C1' O4' N9 C2'
1 1 H8 C8 N9 N7
1 1 H1 N1 C6 C2
2 3 H2 N2 C2 N1
1 5 H3' C3' C4' C2' O3'
2 6 H2' C2' C1' C3'
DC 8
2 6 H5' C5' O5' C4'
1 5 H4' C4' C5' O4' C3'
1 5 H1' C1' O4' N1 C2'
1 1 H6 C6 N1 C5
1 1 H5 C5 C6 C4
2 3 H4 N4 C4 C5
1 5 H3' C3' C4' C2' O3'
2 6 H2' C2' C1' C3'
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