Modeling and structural analysis of PA clan serine proteases

Table 4 Backbone refinement of the modeled PA proteases from Plasmodium falciparum , Pyrococcus furiosus, Neurospora crassa and Arabidopsis thaliana

Structural model	φ-ψ distribution in the regions of Ramachandran’s plot
	Number of residues (percentage)
	Most favoured	Additional allowed	Generously allowed	Disallowed
*P. falciparum*
Before backbone refinement	89(76.1%)	21(17.9%)	4(3.4%)	3(2.6%)
After backbone refinement	84(71.9%)	33(28.2%)	0 (0.0%)	0 (0.0%)
*P. furiosus*
Before backbone refinement	62(56.9%)	40(36.7%)	1(0.9%)	6(5.5%)
After backbone refinement	84(71.8%)	33(28.2%)	0 (0.0%)	0 (0.0%)
*N. crassa*
Before backbone refinement	65(52.0%)	50(40.4%)	4(3.4%)	3(2.6%)
After backbone refinement	69(55.5%)	56(44.8%)	0 (0.0%)	0 (0.0%)
*A. thaliana*
Before backbone refinement	82(60.7%)	45(32.6%)	7(4.4%)	3(2.2%)
After backbone refinement	86(63.7%)	49(36.3%)	0 (0.0%)	0 (0.0%)