Author:

Keywords:

Science & Technology, Life Sciences & Biomedicine, Biochemistry & Molecular Biology, Cell Biology, Internalization motif, LRP1, Endocytosis, Maturation, NPXY motif, Proteasomal degradation, Intracellular domain, Lipoprotein receptor, RECEPTOR-RELATED PROTEIN, TYROSINE PHOSPHORYLATION, CYTOPLASMIC DOMAIN, FUNCTIONAL-ROLE, ADAPTER, CELLS, MICE, ATHEROSCLEROSIS, ENDOCYTOSIS, COMPARTMENT, Amino Acid Motifs, Animals, Embryonic Development, Gene Knock-In Techniques, Low Density Lipoprotein Receptor-Related Protein-1, Mice, Mutation, Proteasome Endopeptidase Complex, Protein Interaction Domains and Motifs, Protein Structure, Tertiary, Receptors, LDL, Survival Analysis, Tumor Suppressor Proteins, 0601 Biochemistry and Cell Biology, 0606 Physiology, 1103 Clinical Sciences, 3101 Biochemistry and cell biology, 3205 Medical biochemistry and metabolomics, 3211 Oncology and carcinogenesis

Abstract:

The proximal NPXY and distal NPXYXXL motifs in the intracellular domain of LRP1 play an important role in regulation of the function of the receptor. The impact of single and double inactivating knock-in mutations of these motifs on receptor maturation, cell surface expression, and ligand internalization was analyzed in mutant and control wild-type mice and MEFs. Single inactivation of the proximal NPXY or in combination with inactivation of the distal NPXYXXL motif are both shown to be associated with an impaired maturation and premature proteasomal degradation of full-length LRP1. Therefore, only a small mature LRP1 pool is able to reach the cell surface resulting indirectly in severe impairment of ligand internalization. Single inactivation of the NPXYXXL motif revealed normal maturation, but direct impairment of ligand internalization. In conclusion, the proximal NPXY motif proves to be essential for early steps in the LRP1 biosynthesis, whereas NPXYXXL appears rather relevant for internalization.