Recombinant human PCSK9 (proprotein convertase subtilisin/kexin type 9), encompassing amino acids 31-692(end). This construct contains the proprotein PCSK9 at the N-terminal encompassing amino acids 31-152. At the C-terminal this construct contains a His-tag (6xHis) followed by an Avi-tag. The recombinant protein was enzymatically biotinylated using the Avi-Tag™ and affinity purified.