Table 3.
Analysis of the dimer interfaces in Bs and SpTrmB
| SpTrmB chain A | BsTrmB chain A | Homodimers (mean) | Transient homodimers (mean) | |
|---|---|---|---|---|
| Subunit interface area (B/2) | 787 | 805 | 1368 | 740 |
| Number of residues | 18 | 20 | 37 | NA |
| Planarity | 1.28 | 1.32 | 3.5 | 2 |
| Interface residue segments | 2 | 3 | 5 | NA |
| Gap volume index | 2.64 | 3.05 | 2.2 | 2.8 |
| Hydrogen bonds per 100 A2 | 1.1 | 1.2 | 0.7 | 1.2 |
| RP score | 0.42 | 0.43 | 4.3 | <1.5 |
| Fraction of fully buried atoms (Fbu) | 0.38 | 0.35 | 0.36 | NA |
| Fraction of nonpolar atoms (Fnp) | 0.62 | 0.63 | 0.65 | 0.63 |
| Non-polar interface area (Fnp*B) | 976 | 1015 | >800 | 932 |
Data for homodimers were obtained from protein–protein interaction server (27) and from Ref. (43). Data for transient homodimers were obtained from protein–protein interaction server and from Ref. (28). Those parameters of interfaces in SpTrmB and BsTrmB which suggest that either SpTrmB and BsTrmB belong to the class of transient homodimers are shown in bold.