Acetylcholinesterase in Insecticide Resistant Culex tritaeniorhynchus: Characteristics Accompanying Insensitivity to Inhibitors

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概要

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• The acctylcholinesterase (AChE) of the Toyama strain (Toyama) of Culex tritaeniorhynchus showed extremely low sensitivity to various kinds of organophosphorus insecticides (OPs) and carbamates. Several characteristics of the AChE of Toyama have been tested and compared with those of the OP susceptible strain (Taiwan). The AChE of Toyama is different from that of Taiwan in many respects. It showed no clear optimum pH and substrate concentration (AChE of Taiwan had both the optimum pH and substrate concentration). Affinity for ACh was high (K_m value for ACh is 0.65 times the value of Taiwan), but affinity for the substrate declined significantly for acetylthiocholine and propionylthiocholine. I_<50> values for OPs were extremely high (66.1-7,079 times the value for Taiwan), and those for carbamates were also higher than those for Taiwan (20.4-112 times). These results suggest that the structure of the AChE of Toyama has changed to an ACh specific form which has a remarkably lower affinity to the OP compounds.

• 日本応用動物昆虫学会の論文
• 1997-02-25

著者

• Ishikawa Yukio

  Laboratory of Applied Entomology, Graduate School of Agricultural and Life Sciences, The University

• KONO Yoshiaki

  Department of Medical Entomology, National Institute of Infectious Diseases

• Kono Y

  Mitsubishi Heavy Industries Ltd. Kobe Shipyard & Machinery Works

• Kono Y

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Mamiya Akira

  Laboratory of Applied Entomology, Faculty of Agriculture, The University of Tokyo

• Mamiya Akira

  Laboratory Of Applied Entomology Faculty Of Agriculture The University Of Tokyo

• Ishikawa Y

  Univ. Tokyo Tokyo Jpn

• Ishikawa Yukio

  Laboratory Of Applied Entomology Graduate School Of Agricultural And Life Sciences The University Of

• Kono Yoshiaki

  Department Of Educational Psychology Tokyo Gakugei University

• Ishikawa Yukio

  Laboratory Of Applied Entomology And Zoology Faculty Of Agriculture Ibaraki University

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