Purification, crystallization and X-ray diffraction study of extracellular dermal glycoprotein from carrot and the inhibition complex that it forms with an endo-β-glucanase from Aspergillus aculeatus

Extracellular dermal glycoprotein (EDGP) may play an important role in the plant defence system of the carrot (Daucus carota) as it has inhibitory activity against endo-β-glucanase produced by invading pathogens. Here, EDGP and the inhibition complex that it forms with FI-CMCase, a carboxyl methyl cellulase from Aspergillus aculeatus, were successfully crystallized. The hexagonal crystal of EDGP belonged to space group P6(2), with unit-cell parameters a=b=130.4, c=44.5 Å, γ=120°. The monoclinic crystal of the complex of EDGP with FI-CMCase belonged to space group C2, with unit-cell parameters a=169.5, b=143.0, c=63.0 Å, β=110.9°.