TM2D1 is a beta-amyloid peptide-binding protein. It contains a structural module related to that of the seven transmembrane domain G protein-coupled receptor superfamily and known to be important in heterotrimeric G protein activation. Beta-amyloid peptide has been established to be a causative factor in neuron death and the consequent diminution of cognitive abilities observed in Alzheimer's disease. This protein may be a target of neurotoxic beta-amyloid peptide, and may mediate cellular vulnerability to beta-amyloid peptide toxicity through a G protein-regulated program of cell death.BBP bound the 42-amino acid form of human beta-amyloid peptide in vitro with high affinity and specificity. Expression of a signaling-deficient dominant-negative BBP mutant suppressed sensitivity of human Ntera-2 neurons to beta-amyloid-mediated toxicity.
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