tokens: With the base domain ( residues 168 - 306 ) alone , the highest similarity is found with P . aeruginosa isochorismate - pyruvate lyase ( unpublished deposition ; PDB code 2H9C , Z score = 4 . 0 , r . m . s . deviation = 4 . 8 A for 51 structurally aligned residues , residues 186 - 191 , 237 - 240 , 257 - 272 and 274 - 298 of P . aeruginosa RdgC chain A and residues 36 - 41 , 50 - 53 , 55 - 66 and 68 - 96 of P . aeruginosa isochorismate - pyruvate lyase chain A ) .