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Figure 3.
Fig. 3. Ribbon diagrams of the nucleotide-free scallop S1
structure in near-rigor, transition, and detached states,
oriented such that the lower 50-kDa subdomains of these three
structures superimpose. An arrow indicates the approximate
direction of the actin filament axis relative to this subdomain,
deduced from electron microscope studies (13, 16). The light
chains bound to the heavy-chain helix of the lever arm in these
three structures are omitted for clarity. Large differences are
found in the position of the converter and result from
relatively small rearrangements of the other three subdomains of
the MD (not shown). In the three scallop S1 structures, the
heavy-chain helix is straight at the junction between the
converter and the lever arm, and the interactions at the
interface between the converter and the ELC seem to be conserved.
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