... helix I and helix II and by a tightturn (His39–Pro42) between helix II and helix III(helix–turn–helix motif; Fig. 1). The DNA recogni-tion helix (helix III) is fairly ordered also in the Keywordsbackbone ... only within helix III,but also over a large portion of the protein, from Phe8to Met56, including the loop and the tight turn. At the same time, in the vicinity of the Arg53 hinge point,precisely ... the 15N–1H vectors of helix I,helix II and the N-terminal segment of helix III donot show major differences in the J (x) values. Con-versely, the C-terminal fragment of helix III haslower mean values...