title: Charge transfer between tryptophan and tyrosine in casein: a pulse radiolysis study.
abstract: Charge transfer from tyrosine to tryptophan radicals in bovine milk casein, as observed using pulse radiolysis technique, is reported. The reactions of casein with hydroxyl, azide, Br(2)(*-) and CCl(3)O(2)(*) radicals have also been studied. Radical transformation was found to take place at a rate of 1.5 x10(4) s(-1). The effect of pH, oxidising radical and the proximity of tyrosine and tryptophan on this radical transformation, as well as repair of the casein radical by ascorbate, have also been studied.
authors.affiliation: Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors.forename: Ravi
authors.initials: R
authors.lastname: Joshi
authors.forename: Tulsi
authors.initials: T
authors.lastname: Mukherjee
mesh_terms: D002364:Caseins / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry; D011675:Pulse Radiolysis; D014364:Tryptophan / Q000737:chemistry*; D014443:Tyrosine / Q000737:chemistry*
chemical_list: D002364:Caseins; D005609:Free Radicals; D014443:Tyrosine; D014364:Tryptophan