Inactivation of the proximal NPXY motif impairs early steps in LRP1 biosynthesis.
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.
Laboratory for Experimental Mouse Genetics, Center for Human Genetics, KU Leuven, Herestraat, Leuven, Belgium.
Sara M
SM
Reekmans
Thorsten
T
Pflanzner
Philip L S M
PL
Gordts
Simone
S
Isbert
Pascale
P
Zimmermann
Wim
W
Annaert
Sascha
S
Weggen
Anton J M
AJ
Roebroek
Claus U
CU
Pietrzik
D020816:Amino Acid Motifs; D000818:Animals; D047108:Embryonic Development; D004705:Endocytosis; D055879:Gene Knock-In Techniques; D026503:Low Density Lipoprotein Receptor-Related Protein-1; D051379:Mice; D009154:Mutation; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D054730:Protein Interaction Domains and Motifs; D017434:Protein Structure, Tertiary; D011973:Receptors, LDL / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D016019:Survival Analysis; D025521:Tumor Suppressor Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism
D026503:Low Density Lipoprotein Receptor-Related Protein-1; C486645:Lrp1 protein, mouse; D011973:Receptors, LDL; D025521:Tumor Suppressor Proteins; D046988:Proteasome Endopeptidase Complex