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Bending of the helical axis

Title HUMAN DNA POLYMERASE BETA COMPLEXED WITH GAPPED DNA CONTAINING AN 8-OXO-7,8-DIHYDRO-GUANINE AND DAMP
PDB code 1MQ2   (PDB summary)
NDB code PD0343 (NDB atlas)
Duplex length 10 base pairs
Protein DNA polymerase beta (EC 2.7.7.7), Polymerase, DNA binding domain: Alpha-helix|beta-barrel

Table 1.   Bending parameters determined with the program ARC_FIT.  
The curvilinear helical axis is calculated with CURVES, and bending of this axis is analysed with ARC_FIT. This program allows to fit a straight line, a plane, an arc, a kinked line, and a double kinked line to the helical axis. Good fits are indicated by low values of sigma2. An arc is fitted if there are at least 7 bp. A kinked line requires at least 8 bp, and the double kinked line requires at least 13 bp. The geometrical parameters are given for all models fitted, but they characterize the shape of the helical axis only if the fit is good. See Help for further explanations.

 Model      sigma2 / Å2   Geometrical parameters 
 Plane  0.039  
 Straight line (x-axis) 0.301  
 Arc  0.160 Radius of curvature:  r = 115 Å
 Kinked line  0.161 Kink angle:  alpha = 10°
 Lengths of straight segments:  l1 = 4 bp,  l2 = 6 bp