Loop conformation and dynamics of the Escherichia coli HPPK apo-enzyme and its binary complex with MgATP.


Comparison of the crystallographic and NMR structures of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) suggests that the enzyme may undergo significant conformational change upon binding to its first substrate, ATP. Two of the three surface loops (loop 2 and loop 3) accounting for most of the conformational differences appear to be confined by… (More)


11 Figures and Tables