title: Comparative complement selection in bacteria enables screening for lead compounds targeted to a purine salvage enzyme of parasites.
abstract: Expression plasmids encoding the hypoxanthine phosphoribosyltransferases (HPRTs) of Plasmodium falciparum, Schistosoma mansoni, Tritrichomonas foetus, and Homo sapiens were subcloned into genetically deficient Escherichia coli that requires complementation by the activity of a recombinant HPRT for growth on semidefined medium. Fifty-nine purine analogs were screened for their abilities to inhibit the growth of these bacteria. Several compounds that selectively altered the growth of the bacteria complemented by the malarial, schistosomal, or tritrichomonal HPRT compared with the growth of bacteria expressing the human enzyme were identified. These results demonstrate that the recombinant approach to screening compounds by complement selection in a comparative manner provides a rapid and efficient method for the identification of new lead compounds selectively targeted to the purine salvage enzymes of parasites.
authors.affiliation: Department of Biochemistry, University of Puerto Rico School of Medicine, San Juan 00936-5067, USA.
authors.forename: A E
authors.initials: AE
authors.lastname: Eakin
authors.forename: R
authors.initials: R
authors.lastname: Nieves-Alicea
authors.forename: R
authors.initials: R
authors.lastname: Tosado-Acevedo
authors.forename: M S
authors.initials: MS
authors.lastname: Chin
authors.forename: C C
authors.initials: CC
authors.lastname: Wang
authors.forename: S P
authors.initials: SP
authors.lastname: Craig
mesh_terms: D000818:Animals; D004269:DNA, Bacterial / Q000378:metabolism; D018076:DNA, Complementary / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D005816:Genetic Complementation Test; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D010957:Plasmids; D010963:Plasmodium falciparum / Q000201:enzymology* / Q000235:genetics; D011687:Purines / Q000378:metabolism*; D012550:Schistosoma mansoni / Q000201:enzymology* / Q000235:genetics; D016835:Tritrichomonas foetus / Q000201:enzymology* / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; D018076:DNA, Complementary; D011687:Purines; D007041:Hypoxanthine Phosphoribosyltransferase