in the enzyme-oligo ( ra ) 50-mg2+ttp complex , the substrate ttp has an anti-glycosidic torsional angle ( chi = 40 +/- 10 degrees ) and an o1'-endo sugar pucker ( delta = 100 +/- 10 degrees ) , indistinguishable from those found in the absence of template and compatible with those of b dna but not with those of a or z dna .
C0012854
dna
C0043442
z dna