Table III. Contour length and protein volumes of UvrB–DNA and UvrBC–DNA complexes.

	No. of molecules	DNA involved in wrap (nm)	Class I volume (kDa)	Class II volume (kDa)	Class III volume (kDa)
UvrB–DNA complexes
UvrB–DNA
Wrapped	50	25	–	185 ± 26 (100%)	–
Not wrapped	6	0	n.d.a	n.d.a	–
UvrBC–DNA complexes
UvrBC–DNA
Wrapped	124	23	n.d.a (5%)	141 ± 11 (78%)	210 ± 10 (17%)
Not wrapped	0	0	–	–	–

^aAmount of complexes too low to determine size accurately.