aeruginosa 110 analogous ahl autoinducers share a common homoserine lactone moiety and typically differ only in their acyl side chain moieties fig2 depicts another typical gram negative luxir circuit 200 consisting of a bacteria cell species ains v fischerii 210 producing within the luxi proteins 220 ahl autoinducers 230 of composition octanoic acid 2 oxo tetrahydro furan 3 yl aimide 235 the ahl autoinducers are received by the luxr protein 240 and affect the bioluminescence of the species ains v fischerii 210 fig3 depicts another typical gram negative luxir circuit 300 consisting of a bacteria cell species expi e carotorova 310 producing within the luxi proteins 320 ahl autoinducers 330 of composition 3 oxo hexanoic acid 335 the ahl autoinducers are received by the luxr protein 340 and affect the synthesis of carbapenom an antibiotic of the species expi e carotorova 310 fig4 depicts another typical gram negative luxir circuit 400 consisting of a bacteria cell species cvii chromobacterium violaceum 410 producing within the luxi proteins 420 ahl autoinducers 430 of composition hexanoic acid 2 oxo tetrahydro furan 3 yl amide 435 the ahl autoinducers are received by the luxr protein 440 and affect the generation of a deep violet pigment named violacein of the species cvii chromobacterium violaceum 410 for the gram positive bacterial species bacillus anthracis a signaling molecule autoinducer 2 ai 2 is synthesized via a luxs type protein the luxs protein converts s ribosylhomocysteine to 4 5 dihydroxyl 2 3 pentanedione catalysing the formation of the ai 2 the species rhii p aeruginosa 110 ains v fischerii 210 expi e carotorova 310 cvii chromobacterium violaceum 410 and similar other species produce a variety of signaling molecules which perform diverse functions.