Enables low-density lipoprotein particle receptor binding activity. Predicted to be involved in several processes, including amyloid-beta clearance by transcytosis; negative regulation of amyloid-beta clearance; and negative regulation of very-low-density lipoprotein particle clearance. Predicted to be located in Golgi apparatus; rough endoplasmic reticulum; and vesicle. Predicted to be active in several cellular components, including cis-Golgi network; endoplasmic reticulum-Golgi intermediate compartment; and rough endoplasmic reticulum lumen. Is expressed in several structures, including central nervous system; egg cylinder; foregut; genitourinary system; and lung. Human ortholog(s) of this gene implicated in Alzheimer's disease; dementia; myocardial infarction; and myopia. Orthologous to human LRPAP1 (LDL receptor related protein associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]