TY - JOUR
T1 - Contrasting fates of the paraquat monocation radical in Escherichia coli B and in Dunaliella salina
AU - Rabinowitch, Haim D.
AU - Rosen, Gerald M.
AU - Fridovich, Irwin
PY - 1987/9
Y1 - 1987/9
N2 - Anaerobic cultures of Escherichia coli exposed to paraquat (PQ2+) accumulated the corresponding monocation radical PQ{plus sign, dot below} both within the cells and in the suspending medium. The green alga, Dunaliella salina, which is susceptible to a light- and O2-dependent toxicity of PQ2+, was nevertheless unable to cause accumulation of PQ{plus sign, dot below}when illuminated anaerobically and could, moreover, discharge the ESR signal and the blue color of PQ{plus sign, dot below} accumulated by E. coli. Spin trapping allowed demonstration of the photoproduction of O-2 within D. salina and of the augmentation of that O-2 production by PQ2+. D. salina appears to contain an electron sink and a heat-labile mechanism for transferring electrons from PQ{plus sign, dot below} to that sink. This mechanism was demonstrable anaerobically but did not prevent PQ{plus sign, dot below}-mediated O-2 production under aerobic conditions.
AB - Anaerobic cultures of Escherichia coli exposed to paraquat (PQ2+) accumulated the corresponding monocation radical PQ{plus sign, dot below} both within the cells and in the suspending medium. The green alga, Dunaliella salina, which is susceptible to a light- and O2-dependent toxicity of PQ2+, was nevertheless unable to cause accumulation of PQ{plus sign, dot below}when illuminated anaerobically and could, moreover, discharge the ESR signal and the blue color of PQ{plus sign, dot below} accumulated by E. coli. Spin trapping allowed demonstration of the photoproduction of O-2 within D. salina and of the augmentation of that O-2 production by PQ2+. D. salina appears to contain an electron sink and a heat-labile mechanism for transferring electrons from PQ{plus sign, dot below} to that sink. This mechanism was demonstrable anaerobically but did not prevent PQ{plus sign, dot below}-mediated O-2 production under aerobic conditions.
UR - http://www.scopus.com/inward/record.url?scp=0023226432&partnerID=8YFLogxK
U2 - 10.1016/0003-9861(87)90576-5
DO - 10.1016/0003-9861(87)90576-5
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C2 - 2821909
AN - SCOPUS:0023226432
SN - 0003-9861
VL - 257
SP - 352
EP - 356
JO - Archives of Biochemistry and Biophysics
JF - Archives of Biochemistry and Biophysics
IS - 2
ER -