Regulates Wnt proteins sorting and secretion in a feedback regulatory mechanism. This reciprocal interaction plays a key role in the regulation of expression, subcellular location, binding and organelle-specific association of Wnt proteins (PubMed:34587386). Plays also an important role in establishment of the anterior-posterior body axis formation during development (By similarity). {ECO:0000250, ECO:0000269|PubMed:16678095, ECO:0000269|PubMed:16678096, ECO:0000269|PubMed:34587386}. This is the function of WLS (Wnt ligand secretion mediator, ENSG00000116729).