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Plant Physiology 77:909-911 (1985)
© 1985 American Society of Plant Biologists

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Articles

Ion Transport Processes in Corn Mitochondria 1

I. Effect of the Local Anesthetic Dibucaine

Robert R. Klein2 and David E. Koeppe3

Department of Agronomy, University of Illinois, Urbana, Illinois 61801

The local anesthetic dibucaine inhibited respiration-dependent contraction mediated by the K+/H+ antiport system of isolated corn mitochondria. Respiration declined concurrently. Nigericin, an exogenous K+/H+ exchanger, restored ion efflux in dibucaine-blocked corn mitochondria. It was concluded that dibucaine inhibited ion efflux via blockage of the K+/H+ antiport. Further experiments determined that dibucaine also inhibited proton influx facilitated by protonophores and by the ATPase complex during state III respiration. These results are discussed in relation to the mechanism by which dibucaine inhibits proton translocation across the inner mitochondrial membrane.

2 Present address: Department of Biochemistry and Biophysics, Texas A & M University, College Station, TX 77843.

3 Permanent address: Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409

1 Supported by funds from the Illinois Agriculture Experiment Station, Urbana.






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Copyright © 1985 by the American Society of Plant Biologists