Biochemical and Biophysical Research Communications
PCSK9 binds to multiple receptors and can be functionally inhibited by an EGF-A peptide
Section snippets
Materials and methods
Recombinant proteins and antibodies. Polyhistidine-tagged human LDLR, human ApoER2, mouse VLDLR and mouse reelin were purchased from R&D Systems as were antibodies to LDLR and mouse VLDLR. Polyhistidine-tagged human JNK2α2 and mouse endostatin were purchased from Calbiochem Inc. Recombinant rat RAP was obtained from PROSPEC Protein Specialists and human RAP from Molecular Innovations. Polyclonal rabbit anti-LDLR used for Western blotting and in-cell Western was obtained from PROGEN Biotechnik.
Results and discussion
Conflicting results have been reported in regard to the ability of PCSK9 to interact with proteins other than LDLR. Zhang et al. reported that no binding of PCSK9 to VLDLR could be detected in transfected COS-M cells [17]. In addition, these authors showed that binding to VLDLR could be conferred by introducing the EGF-A domain of LDLR into VLDLR. In contrast, Poirier et al. showed enhanced PCKS9 association with CHO-A7 cells expressing either ApoER2 or VLDLR after an overnight incubation [16].
Acknowledgments
The Schering Plough Research Institute is funded entirely by Schering-Plough Corporation. The authors would like to thank Drs Harry Davis and Diane Hollenbaugh for valuable discussion and suggestions.
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These authors contributed equally to this work.