title: Specific domains in anterior pharynx-defective 1 determine its intramembrane interactions with nicastrin and presenilin.
abstract: γ-Secretase, a multisubunit transmembrane protease comprised of presenilin, nicastrin, presenilin enhancer 2, and anterior pharynx-defective one, participates in the regulated intramembrane proteolysis of Type I membrane proteins including the amyloid precursor protein (APP). Although Aph-1 is thought to play a structural role in the assembly of γ-secretase complex and several transmembrane domains (TMDs) of Aph-1 have been shown to be critical for its function, the importance of the other domains of Aph-1 remains elusive. We screened a series of Aph-1 mutants and focused on nine mutations distributed in six different TMDs of human APH-1aS, assessing their ability to complement mouse embryonic fibroblasts lacking Aph-1. We showed that mutations in TMD4 (G126) and TMD5 (H171) of Aph-1aS prevented the formation of the Nct/Aph-1 subcomplex. Importantly, although mutations in TMD3 (Q83/E84/R85) and TMD6 (H197) of APH-1aS did not affect Nct/Aph-1 subcomplex formation, both mutations prevented further association/endoproteolysis of PS1. We propose a model that identifies critical TMDs of Aph-1 for associations with Nct and PS for the stepwise assembly of γ-secretase components.
authors.affiliation: Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205-2196, USA.
authors.forename: Po-Min
authors.initials: PM
authors.lastname: Chiang
authors.forename: Ryan R
authors.initials: RR
authors.lastname: Fortna
authors.forename: Donald L
authors.initials: DL
authors.lastname: Price
authors.forename: Tong
authors.initials: T
authors.lastname: Li
authors.forename: Philip C
authors.initials: PC
authors.lastname: Wong
mesh_terms: D053829:Amyloid Precursor Protein Secretases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001665:Binding Sites; D002460:Cell Line; D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism*; D010450:Endopeptidases; D006801:Humans; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008565:Membrane Proteins / Q000737:chemistry* / Q000378:metabolism; D051379:Mice; D009154:Mutation; D010447:Peptide Hydrolases / Q000737:chemistry* / Q000378:metabolism; D053763:Presenilins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D053763:Presenilins; C413604:nicastrin protein; C475154:APH1A protein, human; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D010447:Peptide Hydrolases
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