ジャーナル: Structure / 年: 2014 タイトル: Structural interactions between inhibitor and substrate docking sites give insight into mechanisms of human PS1 complexes. 著者: Yi Li / Stephen Hsueh-Jeng Lu / Ching-Ju Tsai / Christopher Bohm / Seema Qamar / Roger B Dodd / William Meadows / Amy Jeon / Adam McLeod / Fusheng Chen / Muriel Arimon / Oksana Berezovska / ...著者: Yi Li / Stephen Hsueh-Jeng Lu / Ching-Ju Tsai / Christopher Bohm / Seema Qamar / Roger B Dodd / William Meadows / Amy Jeon / Adam McLeod / Fusheng Chen / Muriel Arimon / Oksana Berezovska / Bradley T Hyman / Taisuke Tomita / Takeshi Iwatsubo / Christopher M Johnson / Lindsay A Farrer / Gerold Schmitt-Ulms / Paul E Fraser / Peter H St George-Hyslop / 要旨: Presenilin-mediated endoproteolysis of transmembrane proteins plays a key role in physiological signaling and in the pathogenesis of Alzheimer disease and some cancers. Numerous inhibitors have been ...Presenilin-mediated endoproteolysis of transmembrane proteins plays a key role in physiological signaling and in the pathogenesis of Alzheimer disease and some cancers. Numerous inhibitors have been found via library screens, but their structural mechanisms remain unknown. We used several biophysical techniques to investigate the structure of human presenilin complexes and the effects of peptidomimetic γ-secretase inhibitors. The complexes are bilobed. The head contains nicastrin ectodomain. The membrane-embedded base has a central channel and a lateral cleft, which may represent the initial substrate docking site. Inhibitor binding induces widespread structural changes, including rotation of the head and closure of the lateral cleft. These changes block substrate access to the catalytic pocket and inhibit the enzyme. Intriguingly, peptide substrate docking has reciprocal effects on the inhibitor binding site. Similar reciprocal shifts may underlie the mechanisms of other inhibitors and of the "lateral gate" through which substrates access to the catalytic site.
超分子 #1000: native human Presenilin 1 (PS1) complex
超分子
名称: native human Presenilin 1 (PS1) complex / タイプ: sample / ID: 1000 / 詳細: The sample was monodisperse / 集合状態: 1:1:1:1 / Number unique components: 4
分子量
理論値: 200 KDa
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分子 #1: Presenilin-1
分子
名称: Presenilin-1 / タイプ: protein_or_peptide / ID: 1 / Name.synonym: Protein S182 詳細: N-terminus as tagged with TAP tag composed of Protein G and Streptavidin binding peptide tags separated by tobacco etch virus protease cleavage site コピー数: 1 / 組換発現: Yes