Enables enzyme binding activity and protein sequestering activity. Involved in several processes, including lysosomal transport; positive regulation of macromolecule metabolic process; and regulation of signal transduction. Acts upstream of or within cellular response to leukemia inhibitory factor. Located in lysosome. Is expressed in several structures, including alimentary system; brain; genitourinary system; immune system; and liver and biliary system. Orthologous to human LAPTM5 (lysosomal protein transmembrane 5). [provided by Alliance of Genome Resources, Apr 2022]