The familial dementia BRI2 gene binds the Alzheimer gene amyloid-beta precursor protein and inhibits amyloid-beta production - PubMed (original) (raw)
. 2005 Aug 12;280(32):28912-6.
doi: 10.1074/jbc.C500217200. Epub 2005 Jun 27.
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- PMID: 15983050
- DOI: 10.1074/jbc.C500217200
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The familial dementia BRI2 gene binds the Alzheimer gene amyloid-beta precursor protein and inhibits amyloid-beta production
Shuji Matsuda et al. J Biol Chem. 2005.
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Abstract
Alzheimer disease (AD), the most common senile dementia, is characterized by amyloid plaques, vascular amyloid, neurofibrillary tangles, and progressive neurodegeneration. Amyloid is mainly composed by amyloid-beta (A(beta)) peptides, which are derive from processing of the beta-amyloid precursor protein (APP), better named amyloid-beta precursor protein (A(beta)PP), by secretases. The A(beta)PP intracellular domain (AID), which is released together with A(beta), has signaling function, since it modulates apoptosis and transcription. Despite its biological and pathological importance, the mechanisms regulating A(beta)PP processing are poorly understood. As cleavage of other gamma-secretase substrates is regulated by membrane bound proteins, we have postulated the existence of integral membrane proteins that bind A(beta)PP and regulate its processing. Here, we show that BRI2, a type II membrane protein, interacts with A(beta)PP. Interestingly, 17 amino acids corresponding to the NH2-terminal portion of A(beta) are necessary for this interaction. Moreover, BRI2 expression regulates A(beta)PP processing resulting in reduced A(beta) and AID levels. Altogether, these findings characterize the BRI2-A(beta)PP interaction as a regulatory mechanism of A(beta)PP processing that inhibits A(beta) production. Notably, BRI2 mutations cause familial British (FBD) and Danish dementias (FDD) that are clinically and pathologically similar to AD. Finding that BRI2 pathogenic mutations alter the regulatory function of BRI2 on A(beta)PP processing would define dysregulation of A(beta)PP cleavage as a pathogenic mechanism common to AD, FDD, and FBD.
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