Plant-specific actin binding protein. Part of a membrane-cytoskeletal adapter complex that forms a bridge between the endoplasmic reticulum and the plasma membrane. Dimer or oligomer. Interacts with PVA11/VAP27. Localized in immobile puncta that associate with ER membranes and ER-plasma membrane contact sites. This association is independent of F-actin. The C-terminus is involved in oligomerization and is essential for membrane association. The NAB domain, also called NAB (NET actin-binding) domain, is involved in F-actin binding. Belongs to the NET family.