Table 2.
Nucleotide-specific Smad1 MH1/SBE DNA contacts, phosphate backbone interactions and water-mediated DNA contacts (equivalent contacts by chain B are shown in parentheses)
| Interacting atoms | Distance (Å) |
|---|---|
| DNA base-specific contacts | |
| Arg74A/B NH1-G6D/5C N7 | 3.1 (3.1) |
| Arg74A/B NH2-G6D/5C O6 | 2.9 (3.0) |
| Gln76A/B OE1-A9C/10D N6 | 3.1 (3.1) |
| Gln76A/B O-T8C/9D O5 | 3.2 (3.5) |
| Lys81A/B NZ-A9C/10D N7 | 3.2 (3.1) |
| Lys 81A/B NZ-G10C/11D O6 | 3.3 (3.5) |
| DNA phosphate contacts | |
| Leu71A/B N-G10C/11D O2P | 3.0 (2.8) |
| Gln76A/B N-A9C/10D O2P | 3.0 (2.8) |
| Ser78A/B N-T8C/9D O2P | 3.0 (3.1) |
| His101A/B NE2-A4D/C3C O1P | 4.0 (2.9) |
| Lys40B NZ -W5 O-A10D O1P | 2.8–2.6 |
| Lys39A NZ -W7 O-T8C O1P | 2.9–2.8 |