tokens: Using the tip domain ( residues 74 - 120 ) alone , the ATPase domain of bovine Hsc70 chaperone shows highest structural similarity ( PDB code 1BA1 , Z score = 4 . 8 , r . m . s . deviation = 1 . 7 A for 45 structurally aligned residues , residues 76 - 120 of P . aeruginosa RdgC chain A and residues 230 - 253 and 256 - 276 of the Hsc70 ATPase domain ) ( 21 ) .