title: Structure and inhibition of plasmepsin II, a hemoglobin-degrading enzyme from Plasmodium falciparum.
abstract: Plasmodium falciparum is the major causative agent of malaria, a disease of worldwide importance. Resistance to current drugs such as chloroquine and mefloquine is spreading at an alarming rate, and our antimalarial armamentarium is almost depleted. The malarial parasite encodes two homologous aspartic proteases, plasmepsins I and II, which are essential components of its hemoglobin-degradation pathway and are novel targets for antimalarial drug development. We have determined the crystal structure of recombinant plasmepsin II complexed with pepstatin A. This represents the first reported crystal structure of a protein from P. falciparum. The crystals contain molecules in two different conformations, revealing a remarkable degree of interdomain flexibility of the enzyme. The structure was used to design a series of selective low molecular weight compounds that inhibit both plasmepsin II and the growth of P. falciparum in culture.
authors.affiliation: Structural Biochemistry Program, National Cancer Institute/SAIC, Frederick, MD 21702, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Silva
authors.forename: A Y
authors.initials: AY
authors.lastname: Lee
authors.forename: S V
authors.initials: SV
authors.lastname: Gulnik
authors.forename: P
authors.initials: P
authors.lastname: Maier
authors.forename: J
authors.initials: J
authors.lastname: Collins
authors.forename: T N
authors.initials: TN
authors.lastname: Bhat
authors.forename: P J
authors.initials: PJ
authors.lastname: Collins
authors.forename: R E
authors.initials: RE
authors.lastname: Cachau
authors.forename: K E
authors.initials: KE
authors.lastname: Luker
authors.forename: I Y
authors.initials: IY
authors.lastname: Gluzman
authors.forename: S E
authors.initials: SE
authors.lastname: Francis
authors.forename: A
authors.initials: A
authors.lastname: Oksman
authors.forename: D E
authors.initials: DE
authors.lastname: Goldberg
authors.forename: J W
authors.initials: JW
authors.lastname: Erickson
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D016282:Aspartic Acid Endopeptidases / Q000037:antagonists & inhibitors* / Q000737:chemistry*; D002402:Cathepsin D / Q000737:chemistry; D003001:Cloning, Molecular; D017124:Conserved Sequence; D018360:Crystallography, X-Ray; D004926:Escherichia coli; D006454:Hemoglobins / Q000378:metabolism*; D006801:Humans; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D010963:Plasmodium falciparum / Q000201:enzymology*; D011480:Protease Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D017433:Protein Structure, Secondary; D015800:Protozoan Proteins; D011994:Recombinant Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
chemical_list: D006454:Hemoglobins; D011480:Protease Inhibitors; D015800:Protozoan Proteins; D011994:Recombinant Proteins; D016282:Aspartic Acid Endopeptidases; C089643:plasmepsin; C100637:plasmepsin II; D002402:Cathepsin D