title: Cleavage of amyloid-beta precursor protein and amyloid-beta precursor-like protein by BACE 1.
abstract: Site-specific proteolysis of the amyloid-beta precursor protein (APP) by BACE 1 and gamma-secretase, a central event in Alzheimer disease, releases a large secreted extracellular fragment (called APP(S)), peptides of 40-43 residues derived from extracellular and transmembrane sequences (Abeta), and a short intracellular fragment (APP intracellular domain) that may function as a transcriptional activator in a complex with the adaptor protein Fe65 and the nuclear protein Tip60. APP is closely related to APP-like protein (APLP) 1 and APLP2, but only APP is known to be cleaved by BACE 1 and to be involved in Alzheimer disease. We now demonstrate that similar to APP, APLP1 and APLP2 are also cleaved by BACE 1 but not by ADAM 9, another APP protease, and also transactivate nuclear Tip60 in a complex with Fe65. Paradoxically, although BACE 1 cleavage appears to be specific for APP and APLPs, their cleavage sequences exhibit no homology, and a short sequence (7 amino acids) from APP that when placed close to the membrane converts a membrane protein that is normally not cleaved by BACE 1 into a BACE 1 substrate. Our data demonstrate that APLPs and APP are processed similarly to act via the same nuclear target, suggesting that BACE 1 cleavage regulates a common function of APP and APLPs in neurons.
authors.affiliation: Center for Basic Neuroscience, Department of Molecular Genetics and Howard Hughes Medical Institute, The University of Texas Southwestern Medical Center, Dallas, Texas 75390-9111, USA.
authors.forename: Qiming
authors.initials: Q
authors.lastname: Li
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Südhof
mesh_terms: D051722:ADAM Proteins; D000123:Acetyltransferases / Q000737:chemistry; D000595:Amino Acid Sequence; D053829:Amyloid Precursor Protein Secretases; D016564:Amyloid beta-Protein Precursor / Q000737:chemistry* / Q000378:metabolism; D000818:Animals; D016282:Aspartic Acid Endopeptidases / Q000502:physiology*; D019556:COS Cells; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D019483:Disintegrins / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D010450:Endopeptidases; D005822:Genetic Vectors; D006367:HeLa Cells; D051548:Histone Acetyltransferases; D006801:Humans; D015151:Immunoblotting; D000074443:Lysine Acetyltransferase 5; D008565:Membrane Proteins / Q000737:chemistry; D008666:Metalloendopeptidases / Q000737:chemistry; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry* / Q000378:metabolism; D009474:Neurons / Q000378:metabolism; D009687:Nuclear Proteins / Q000737:chemistry; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D014162:Transfection
chemical_list: C091042:APBB1 protein, human; C489697:APLP1 protein, human; C084104:APLP2 protein, human; D016564:Amyloid beta-Protein Precursor; C486243:Apbb1 protein, mouse; C492952:Aplp2 protein, mouse; D019483:Disintegrins; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D000123:Acetyltransferases; D051548:Histone Acetyltransferases; C098489:KAT5 protein, human; D000074443:Lysine Acetyltransferase 5; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human; C509282:Bace1 protein, mouse; D051722:ADAM Proteins; C098339:ADAM9 protein, human; C498316:Adam9 protein, mouse; D008666:Metalloendopeptidases