title: Regulation of X11L-dependent amyloid precursor protein metabolism by XB51, a novel X11L-binding protein.
abstract: We isolated a cDNA encoding a novel protein, XB51, that interacts with the amino-terminal domain of the neuron-specific X11-like protein (X11L). The protein XB51 inhibited the association of X11L with amyloid precursor protein through a non-competitive mechanism and abolished the suppression of beta-amyloid production by X11L. The majority of XB51 is localized around the nucleus and recovered in 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonic acid (CHAPS) buffer-insoluble fraction when XB51 is expressed in cells. Association of XB51 with X11L changed the intracellular distribution of XB51 and resulted in redistribution of XB51 into the CHAPS buffer-soluble fraction. These observations suggest that XB51, together with X11L, plays an important role in the regulatory system of amyloid precursor protein metabolism and beta-amyloid generation.
authors.affiliation: Laboratory of Neurobiophysics, School of Pharmaceutical Sciences, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: D S
authors.initials: DS
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Tomita
authors.forename: Y
authors.initials: Y
authors.lastname: Kirino
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D016564:Amyloid beta-Protein Precursor / Q000378:metabolism*; D000818:Animals; D019556:COS Cells; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism*; D003001:Cloning, Molecular; D018076:DNA, Complementary; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism*; D011485:Protein Binding; D017386:Sequence Homology, Amino Acid
chemical_list: C079091:APBA1 protein, human; D048868:Adaptor Proteins, Signal Transducing; D016564:Amyloid beta-Protein Precursor; C513072:Apba1 protein, mouse; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins; D018076:DNA, Complementary; C412571:NECAB3 protein, human; C485870:Necab3 protein, mouse; D009419:Nerve Tissue Proteins