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• W1522289105 startingPage "4121" @default.
• W1522289105 abstract "Proprotein convertase subtilisin/kexin type 9 (PCSK9) interferes with the recycling of low-density lipoprotein (LDL) receptor (LDLR). This leads to LDLR degradation and reduced cellular uptake of plasma LDL. Naturally occurring human PCSK9 loss-of-function mutations are associated with low levels of plasma LDL cholesterol and a reduced risk of coronary heart disease. PCSK9 gain-of-function mutations result in lower LDL clearance and increased risk of atherosclerosis. The exact mechanism by which PCSK9 disrupts the normal recycling of LDLR remains to be determined. In this study, we have assembled homologs of human PCSK9 from 20 vertebrates, a cephalochordate and mollusks in order to search for conserved regions of PCSK9 that may be important for the PCSK9-mediated degradation of LDLR. We found a large, conserved protrusion on the surface of the PCSK9 catalytic domain and have performed site-directed mutagenesis experiments for 13 residues on this protrusion. A cluster of residues that is important for the degradation of LDLR by PCSK9 was identified. Another cluster of residues, at the opposite end of the conserved protrusion, appears to be involved in the physical interaction with a putative inhibitor of PCSK9. This study identifies the residues, sequence segments and surface patches of PCSK9 that are under strong purifying selection and provides important information for future studies of PCSK9 mutants and for investigations on the function of this regulator of cholesterol homeostasis." @default.
• W1522289105 created "2016-06-24" @default.
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• W1522289105 date "2008-07-09" @default.
• W1522289105 modified "2023-10-01" @default.
• W1522289105 title "Investigations on the evolutionary conservation of PCSK9 reveal a functionally important protrusion" @default.
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• W1522289105 doi "https://doi.org/10.1111/j.1742-4658.2008.06553.x" @default.
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