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10.1074/jbc.M115.642991

http://scihub22266oqcxt.onion/10.1074/jbc.M115.642991
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suck abstract from ncbi


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pmid26195630      J+Biol+Chem 2015 ; 290 (38): 23385-400
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  • Plasma Membrane Tetraspanin CD81 Complexes with Proprotein Convertase Subtilisin/Kexin Type 9 (PCSK9) and Low Density Lipoprotein Receptor (LDLR), and Its Levels Are Reduced by PCSK9 #MMPMID26195630
  • Le QT; Blanchet M; Seidah NG; Labonte P
  • J Biol Chem 2015[Sep]; 290 (38): 23385-400 PMID26195630show ga
  • Proprotein convertase subtilisin/kexin type 9 (PCSK9) is an important factor in plasma cholesterol regulation through modulation of low density lipoprotein receptor (LDLR) levels. Naturally occurring mutations can lead to hyper- or hypocholesterolemia in human. Recently, we reported that PCSK9 was also able to modulate CD81 in Huh7 cells. In the present study, several gain-of-function and loss-of-function mutants as well as engineered mutants of PCSK9 were compared for their ability to modulate the cell surface expression of LDLR and CD81. Although PCSK9 gain-of-function D374Y enhanced the degradation both receptors, D374H and D129N seemed to only reduce LDLR levels. In contrast, mutations in the C-terminal hinge-cysteine-histidine-rich domain segment primarily affected the PCSK9-induced CD81 degradation. Furthermore, when C-terminally fused to an ACE2 transmembrane anchor, the secretory N-terminal catalytic or hinge-cysteine-histidine-rich domain domains of PCSK9 were able to reduce CD81 and LDLR levels. These data confirm that PCSK9 reduces CD81 levels via an intracellular pathway as reported for LDLR. Using immunocytochemistry, a proximity ligation assay, and co-immunoprecipitation, we found that the cell surface level of PCSK9 was enhanced upon overexpression of CD81 and that both PCSK9 and LDLR interact with this tetraspanin protein. Interestingly, using CHO-A7 cells lacking LDLR expression, we revealed that LDLR was not required for the degradation of CD81 by PCSK9, but its presence strengthened the PCSK9 effect.
  • |*Proteolysis[MESH]
  • |Amino Acid Substitution[MESH]
  • |Animals[MESH]
  • |CHO Cells[MESH]
  • |Cricetinae[MESH]
  • |Cricetulus[MESH]
  • |Gene Expression Regulation/*physiology[MESH]
  • |Humans[MESH]
  • |Multiprotein Complexes/genetics/*metabolism[MESH]
  • |Mutation, Missense[MESH]
  • |Proprotein Convertase 9[MESH]
  • |Proprotein Convertases/genetics/*metabolism[MESH]
  • |Receptors, LDL/*biosynthesis/genetics[MESH]
  • |Serine Endopeptidases/genetics/*metabolism[MESH]


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