title: Beta-amyloid protein converting enzyme 1 and brain-specific type II membrane protein BRI3: binding partners processed by furin.
abstract: Using a yeast two-hybrid system, we screened a human brain cDNA library for possible interacting proteins with the C-terminal cytosolic tail of the beta-secretase beta-amyloid protein converting enzyme (BACE)1. This identified seven potential candidates, including the brain-specific type II membrane protein BRI3. Co-localization and co-immunoprecipitation experiments confirmed that BACE1 and BRI3 co-localize and interact with each other via the cytosolic tail of BACE1. Furthermore, pulse and pulse-chase analyses revealed that the pro-protein convertases furin, and to a lesser extent PC7 and PC5A, process BRI3 into a C-terminal secreted approximately 4-kDa product. Thus, furin efficiently processes both pro-BACE1 and its novel interacting protein pro-BRI3.
authors.affiliation: Laboratory of Biochemical Neuroendocrinology, Clinical Research Institute of Montreal, Montreal, Quebec, Canada.
authors.forename: Louise
authors.initials: L
authors.lastname: Wickham
authors.forename: Suzanne
authors.initials: S
authors.lastname: Benjannet
authors.forename: Edwige
authors.initials: E
authors.lastname: Marcinkiewicz
authors.forename: Michel
authors.initials: M
authors.lastname: Chretien
authors.forename: Nabil G
authors.initials: NG
authors.lastname: Seidah
mesh_terms: D000595:Amino Acid Sequence; D053829:Amyloid Precursor Protein Secretases; D016229:Amyloid beta-Peptides / Q000378:metabolism*; D000818:Animals; D016282:Aspartic Acid Endopeptidases / Q000235:genetics / Q000378:metabolism*; D001921:Brain / Q000378:metabolism; D002460:Cell Line; D010450:Endopeptidases; D045683:Furin / Q000378:metabolism*; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins; D011485:Protein Binding / Q000502:physiology; D025941:Protein Interaction Mapping; D011499:Protein Processing, Post-Translational; D014162:Transfection
chemical_list: D016229:Amyloid beta-Peptides; C499959:BRI3 protein, human; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D045683:Furin; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human; C509282:Bace1 protein, mouse