We simulated this motion by rotating the LNS5+EGF3 segment outward by 18°, using the Pro1085 at the EGF3-LNS6 junction as a pivot point (Fig. 6B).
Further necessary structural changes, in addition to release of the fusion peptide from its pocket, are dissociation of two strands (HA2, residues 21 38) from the edge of the small β-sheet near the base of the HA trimer and displacement outward of this segment of HA2 along with the short first helix, which could unfold and refold as it adds to the extending, central helical coiled-coil.
Construction was carried out using the cantilever method, with segments being built outward from two piers, each segment tied to the previous one by high-strength steel tendons.
The models and experiments explain this as a consequence of a 'sliding-trapdoor' ring-fault architecture that is mostly composed of outward-inclined reverse segments, most markedly so on the volcano's western flanks but includes inward-inclined normal segments on its eastern flanks.
For targets in the inner (1.8 8.5°) and middle (8.5 15.6°) rings, attention also tended to spread outward, radially to other segments.
Our results favour outward-dipping fault segments in the western half of the ring fault, while the eastern half is preferentially inward-dipping.
Based on the above results, we conclude that the rings of positive charged lysines formed by the hβ2 extracellualr segment confer the outward rectification of mSlo1+hβ2 channels.
Therefore, a major mechanism in the dimerization-induced activation of plexin appears to be the outward shift of the activation segment, which opens the otherwise obstructed active site to allow Rap binding and catalysis of GTP hydrolysis.
The pedipalps and legs are composed of seven segments (from the body outward: coxa, trochanter, femur, patella, tibia, basitarsus, and tarsus).
One of the line segments was surrounded by inward-pointing arrowheads; the other line segment was surrounded by outward-pointing arrowheads.
