title: A sensitive enzyme-linked immunosorbent assay for dihydrofolate reductase.
abstract: A competitive enzyme-linked immunosorbent assay (ELISA) has been developed for the enzyme, dihydrofolate reductase. The sensitivity of the assay system approximates 3 ng of immunoreactive enzyme protein which is comparable to the sensitivity achieved in the radioimmunoassay (RIA) for this enzyme. The mean coefficient of variation for within--and between--assay precision was less than 13%. The assay appears to be specific and valid as the concentration of the enzyme is the same whether measured by ELISA or [3H]-methotrexate binding. Since this method, like the RIA, measures the mass concentration of enzyme protein, in conjunction with a [3H]-methotrexate binding assay it will be useful for quantitating functional as well as non-functional immunoreactive forms of the enzyme.
authors.affiliation: Department of Biochemistry, Aga Khan University Medical College, Karachi, Pakistan.
authors.forename: M P
authors.initials: MP
authors.lastname: Iqbal
authors.forename: R
authors.initials: R
authors.lastname: Hussain
mesh_terms: D000818:Animals; D002417:Cattle; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D011863:Radioimmunoassay / Q000379:methods; D013762:Tetrahydrofolate Dehydrogenase / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D013762:Tetrahydrofolate Dehydrogenase