title: Structure of the protease domain of memapsin 2 (beta-secretase) complexed with inhibitor.
abstract: Memapsin 2 (beta-secretase) is a membrane-associated aspartic protease involved in the production of beta-amyloid peptide in Alzheimer's disease and is a major target for drug design. We determined the crystal structure of the protease domain of human memapsin 2 complexed to an eight-residue inhibitor at 1.9 angstrom resolution. The active site of memapsin 2 is more open and less hydrophobic than that of other human aspartic proteases. The subsite locations from S4 to S2' are well defined. A kink of the inhibitor chain at P2' and the change of chain direction of P3' and P4' may be mimicked to provide inhibitor selectivity.
authors.affiliation: Protein Studies Program and Crystallography Program, Oklahoma Medical Research Foundation, 825 NE 13th Street, Oklahoma City, OK 73104, USA.
authors.forename: L
authors.initials: L
authors.lastname: Hong
authors.forename: G
authors.initials: G
authors.lastname: Koelsch
authors.forename: X
authors.initials: X
authors.lastname: Lin
authors.forename: S
authors.initials: S
authors.lastname: Wu
authors.forename: S
authors.initials: S
authors.lastname: Terzyan
authors.forename: A K
authors.initials: AK
authors.lastname: Ghosh
authors.forename: X C
authors.initials: XC
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Tang
mesh_terms: D053829:Amyloid Precursor Protein Secretases; D016282:Aspartic Acid Endopeptidases / Q000737:chemistry* / Q000378:metabolism; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D010450:Endopeptidases; D006801:Humans; D006860:Hydrogen Bonding; D008958:Models, Molecular; D009842:Oligopeptides / Q000378:metabolism*; D011480:Protease Inhibitors / Q000737:chemistry / Q000378:metabolism*; D011487:Protein Conformation; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism
chemical_list: C414614:OM99-2; D009842:Oligopeptides; D011480:Protease Inhibitors; D011994:Recombinant Proteins; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D016282:Aspartic Acid Endopeptidases; C509284:BACE2 protein, human; C509280:BACE1 protein, human