Abstract
Expansins are a group of plant cell wall loosening proteins. In animals, functional expansin (EXPB1) has been discovered in the golden potato cyst nematode Globodera rostochiensis. In plant-parasitic nematodes expansins act as the parasitism factors or effectors. Molecular variability of another expansin (expB2) gene was evaluated in diverse populations of the G. rostochiensis. 3D modelling of GR-EXPB2 protein sequences revealed variants with different tertiary protein structure. Superimposing PDB structures of the protein model of common type protein with two longer variants revealed difference in position of one loop in the two longer proteins. All longer GREXPB2 variants originated from South America.
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