A synergistic effect of phosphate, pH and Phe159 substitution on the formycin A association to the E. coli purine nucleoside phosphorylase
Keywords: Absorption; Association; Emission; Formycin A; E.coli purine nucleoside phosphorylase (PNPWT); E.coli PNP mutants; Asp; aspartic acid; Arg; arginine; E; efficiency of FRET; f; fractional intensity; FA; formycin A; FAâ; formycin A anion; FRET; Fluorescen