NOT KNOWN FACTUAL STATEMENTS ABOUT PKRRATING

3B). R526 in the loop concerning αJ and αI anchors the C-terminal part of the activation loop by forming a salt bridge with E458 at the base of αEF. Q459 stabilizes the HRD motif by a hydrogen bond to the principle chain carbonyl of R413. The suggestion of the activation phase is stabilized by a hydrogen bond amongst Y454 and E480 from αF. duri