LITTLE KNOWN FACTS ABOUT PKRRATING.

3B). R526 through the loop amongst αJ and αI anchors the C-terminal part of the activation loop by forming a salt bridge with E458 at The bottom of αEF. Q459 stabilizes the HRD motif by a hydrogen bond to the key chain carbonyl of R413. The suggestion on the activation section is stabilized by a hydrogen bond involving Y454 and E480 from αfile.