TrimethoprimTetrahydrofolate DehydrogenaseTrimethoprim ResistanceFolic Acid AntagonistsMethotrexateTrimetrexateSulfamethoxazoleDrug ResistanceLactobacillus caseiDihydropteroate SynthaseTrimethoprim-Sulfamethoxazole CombinationPyrimethamineThymidylate SynthaseNADPEscherichia coliAminopterinTetrahydrofolatesFolic AcidPolyglutamic AcidAnti-Infective Agents, UrinaryGene AmplificationProguanilNitrate ReductasesKineticsSulfadoxineCricetinaeR FactorsMolecular Sequence DataCricetulusHydroxymethylglutaryl CoA ReductasesLeukemia L1210Drug Resistance, MicrobialDrug CombinationsGenesBase SequenceDapsoneRibonucleotide ReductasesAntimalarialsPlasmidsAmino Acid SequencePneumocystisMutationCytochrome-B(5) ReductaseTriazinesPlasmodium falciparumNitrite ReductasesAnti-Bacterial AgentsMicrobial Sensitivity TestsOxidoreductasesModels, MolecularSulfadiazineGlutathione ReductaseDihydropteridine ReductaseFMN ReductaseThioredoxin-Disulfide ReductaseProtein ConformationPteridinesSarcoma 180NADPH-Ferrihemoprotein ReductaseCloning, MolecularHydroxymercuribenzoatesSulfisoxazoleBinding SitesFerredoxin-NADP ReductaseCell LineCytochrome ReductasesThymidine MonophosphatePterinsMalaria, FalciparumCHO CellsPyrimidinesStructure-Activity RelationshipNucleic Acid HybridizationUrinary Tract InfectionsDNA, ProtozoanPteroylpolyglutamic AcidsPneumocystis cariniiDNA Restriction EnzymesPneumocystis jiroveciiProtein BindingDNAAnti-Infective AgentsOvary4-Aminobenzoic AcidPoint MutationPneumonia, PneumocystisGenes, BacterialMoritellaBiopterinPolymerase Chain ReactionRNA, MessengerMolecular StructureTranscription, GeneticDrug Resistance, BacterialDNA, BacterialPneumocystis InfectionsCatalysisShigella sonneiEnterobacteriaceaeCrystallography, X-Ray