3884197 P-loop phosphate-binding loop 57 3884201 P-loop phosphate-loop 5 3884199 P-loop pore loop 2 3884203 P-loop particularly in the ATP-binding loop 1 3884202 P-loop permeation loop 1 3884200 P-loop phosphorylation site is a Walker A 1 3884206 P-loop positive-feedback loop 1 3884204 P-loop potential ATP/GTP-binding-site motif 1 3884205 P-loop putative nucleotide triphosphate-binding motifs 1