Catalyzes the first step in the proteolytic activation of the sterol regulatory element-binding proteins (SREBPs). Other known substrates are BDNF and ATF6. Cleaves after hydrophobic or small residues, provided that Arg or Lys is in position P4. Cleaves known substrates after Arg-Ser-Val-Leu (SERBP-2), Arg-His-Leu-Leu (ATF6), Arg-Gly-Leu-Thr (BDNF) and its own propeptide after Arg-Arg-Leu-Leu.
Specificity
Natural and recombinant Human Membrane-bound transcription factor site-1 protease
Subcellular Location
Endoplasmic reticulum membrane Single-pass type I membrane protein Golgi apparatus membrane Single-pass type I membrane protein May sort to other organelles, including lysosomal and/or endosomal compartments.