... vulgaris showing the relative positions of the FMN, tryptophan side chains and tyrosineside chains. TheFMNisshowninyellow,tryptophan side chains in magenta, and tyrosine side chains in green. ... Stephen G. MayhewDepartment of Biochemistry, University College Dublin, Bel®eld, Dublin, Ireland1The kinetics and thermodynamics of the urea-inducedunfolding of ¯avodoxin and apo¯avodoxin from ... thecorresponding reactions of its apoprotein. This ¯avodoxincontains two residues of tryptophan and ®ve residues of tyrosine. A tyrosine side chain (Y9 8) is almost coplanar withthe face of the dimethylisoalloxazine...