Data collection and refinement statistics for apo and NAD-bound forms of <i>Thermus thermophilus</i> MDH (TtMDH).

a Values in parentheses are for the highest resolution shell. b Rmerge = ΣhklΣi|Ii(hkl)−〈Ii(hkl)〉|/ΣhklΣiIi(hkl), where Ii(hkl) is the intensity of the ith observation and 〈I(hkl)〉 is the mean intensity of the reflections. c R/Rfree = Σhkl||Fobs| − |Fcalc||/Σhkl|Fobs|, where R and Rfree are calculated by the working and test reflections, respectively. d Percentage of residues in most favoured/additionally allowed/generously allowed/disallowed regions of Ramachandran plot, according to PROCHECK [34].