Chaperone specifically assisting the folding of beta-propeller/EGF modules within the family of low-density lipoprotein receptors (LDLRs). Acts as a modulator of the Wg pathway, since some LDLRs are coreceptors for the canonical Wnt pathway. Monomer (By similarity). Interacts with Arrow and Yolkless. The LDLR maturation activity resides in the N- and C-terminal unstructured regions. Belongs to the MESD family.