Table 1.
Structural database of nonhomologous helical membrane proteins
| Protein | Protein Data Base | Resolution, Å | Helix–helix interactions*† | Cα—H⋅⋅⋅O contacts‡ |
|---|---|---|---|---|
| Bacteriorhodopsin | 1c3w | 1.55 | 9 | 13 (6) |
| Calcium ATPase | 1eul | 2.60 | 15 | 11 (4) |
| Cytochrome c oxidase | 1occ | 2.80 | 48 | 53 (12) |
| Fumarate reductase | 1qla | 2.20 | 6 | 5 (2) |
| Glycerol facilitator | 1fx8 | 2.20 | 9 | 19 (11) |
| Glycophorin A | 1afo | NMR | 1 | 12 (6) |
| Light-harvesting complex II | 1lgh | 2.40 | 1 | 0 |
| Mechanosensitive channel | 1msl | 3.50 | 3 | 0 |
| Photosynthetic reaction center | 1prc | 2.30 | 13 | 19 (4) |
| Potassium channel | 1bl8 | 3.20 | 7 | 7 (3) |
| Rhodopsin | 1f88 | 2.80 | 13 | 6 (3) |
| Total | 125 | 145 (51) |
*
Helical segments as identified by the dssp program (21).
†
Unique interactions in homo-oligomers.
‡
Number of contacts with dH < 3.5 Å and ζ > 120° (number of contacts with d < 2.7 Å).