title: Roles of the juxtamembrane and extracellular domains of angiotensin-converting enzyme in ectodomain shedding.
abstract: Angiotensin-converting enzyme (ACE) is one of a growing number of integral membrane proteins that is shed from the cell surface through proteolytic cleavage by a secretase. To investigate the requirements for ectodomain shedding, we replaced the glycosylphosphatidylinositol addition sequence in membrane dipeptidase (MDP) - a membrane protein that is not shed - with the juxtamembrane stalk, transmembrane (TM) and cytosolic domains of ACE. The resulting construct, MDP-STM(ACE), was targeted to the cell surface in a glycosylated and enzymically active form, and was shed into the medium. The site of cleavage in MDP-STM(ACE) was identified by MS as the Arg(374)-Ser(375) bond, corresponding to the Arg(1203)-Ser(1204) secretase cleavage site in somatic ACE. The release of MDP-STM(ACE) and ACE from the cells was inhibited in an identical manner by batimastat and two other hydroxamic acid-based zinc metallosecretase inhibitors. In contrast, a construct lacking the juxtamembrane stalk, MDP-TM(ACE), although expressed at the cell surface in an enzymically active form, was not shed, implying that the juxtamembrane stalk is the critical determinant of shedding. However, an additional construct, ACEDeltaC, in which the N-terminal domain of somatic ACE was fused to the stalk, TM and cytosolic domains, was also not shed, despite the presence of a cleavable stalk, implying that in contrast with the C-terminal domain, the N-terminal domain lacks a signal required for shedding. These data are discussed in the context of two classes of secretases that differ in their requirements for recognition of substrate proteins.
authors.affiliation: Proteolysis Research Group, School of Biochemistry and Molecular Biology, University of Leeds, Leeds LS2 9JT, UK.
authors.forename: S
authors.initials: S
authors.lastname: Pang
authors.forename: A J
authors.initials: AJ
authors.lastname: Chubb
authors.forename: S L
authors.initials: SL
authors.lastname: Schwager
authors.forename: M R
authors.initials: MR
authors.lastname: Ehlers
authors.forename: E D
authors.initials: ED
authors.lastname: Sturrock
authors.forename: N M
authors.initials: NM
authors.lastname: Hooper
mesh_terms: D000595:Amino Acid Sequence; D053829:Amyloid Precursor Protein Secretases; D001120:Arginine / Q000737:chemistry; D016282:Aspartic Acid Endopeptidases; D015153:Blotting, Western; D002455:Cell Division; D003600:Cytosol / Q000737:chemistry; D018076:DNA, Complementary / Q000378:metabolism; D004150:Dipeptidases / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D010450:Endopeptidases / Q000737:chemistry; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D007425:Intracellular Membranes / Q000737:chemistry*; D013058:Mass Spectrometry; D008666:Metalloendopeptidases / Q000737:chemistry; D018613:Microscopy, Confocal; D008969:Molecular Sequence Data; D007703:Peptidyl-Dipeptidase A / Q000737:chemistry*; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D012694:Serine / Q000737:chemistry; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D018076:DNA, Complementary; D004791:Enzyme Inhibitors; D012694:Serine; D001120:Arginine; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D004150:Dipeptidases; C038937:dipeptidase; D007703:Peptidyl-Dipeptidase A; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human; D008666:Metalloendopeptidases; C039830:peptidyl-Lys metalloendopeptidase