A SECRET WEAPON FOR PKRRATING

3B). R526 with the loop concerning αJ and αI anchors the C-terminal portion 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 primary chain carbonyl of R413. The suggestion with the activation section is stabilized by a hydrogen bond in between Y454 and E480 from