<i>Plasmodium</i> actin I–α-actin chimera forms long filaments.

<p>(<b>A</b>) Electron cryo-micrograph of the chimera filaments. (<b>B</b>) Negatively stained chimera filaments. (<b>C</b>) The crystal structure of the chimera (blue) resembles that of wild-type actin I (red). The zoomed views show the differences in the D-loop around Tyr54 (above) and the C-terminal helix and the hydrophobic residues nearby, which are in the canonical orientation in the chimera, unlike in actin I (below).