TY - JOUR
T1 - Plant sterol 14 alpha-demethylase affinity for azole fungicides
AU - Lamb, David Christopher
AU - Kelly, Diane Elizabeth
AU - Bak, Soren
AU - Warrilow, Andrew G. S.
AU - Kelly, Steven Lewis
AU - Cannieux, Michel
AU - Kahn, Rachel A.
AU - Manning, Nigel J.
N1 - Lamb, D. C., Cannieux, M., Warrilow, A. G. S., Bak, S., Kahn, R. A., Manning, N. J., Kelly, D. E., Kelly, S. L. (2001). Plant sterol 14 alpha-demethylase affinity for azole fungicides. Biochemical and Biophysical Research Communications, 284, (3), 845-849.
Sponsorship: Biotechnology and Biological Science Research
Council (BBSRC)
PY - 2001/6/15
Y1 - 2001/6/15
N2 - Azole fungicides were thought to have much greater affinity for the fungal cytochrome P450 enzyme, sterol 14α-demthylase (CYP51) than the plant orthologue. Using purified CYP51 from the plant Sorghum bicolor L Moenech, a direct comparison of the sensitivity to the fungicides triadimenol and tebuconazole has been carried out. S. bicolor CYP51 was purified to homogenity as determined by SDS–PAGE and specific heme content. Addition of the azole fungicides triadimenol and tebuconazole induced type II spectral changes, with saturation occurring at equimolar azole/P450 concentrations. Inhibition of reconstituted activities revealed only a threefold insensitivity of the plant CYP51 compared to a fungal CYP51, from the phytopathogen Ustilago maydis, as judged by IC50 values. The implications for fungicide mode of action and application are discussed.
AB - Azole fungicides were thought to have much greater affinity for the fungal cytochrome P450 enzyme, sterol 14α-demthylase (CYP51) than the plant orthologue. Using purified CYP51 from the plant Sorghum bicolor L Moenech, a direct comparison of the sensitivity to the fungicides triadimenol and tebuconazole has been carried out. S. bicolor CYP51 was purified to homogenity as determined by SDS–PAGE and specific heme content. Addition of the azole fungicides triadimenol and tebuconazole induced type II spectral changes, with saturation occurring at equimolar azole/P450 concentrations. Inhibition of reconstituted activities revealed only a threefold insensitivity of the plant CYP51 compared to a fungal CYP51, from the phytopathogen Ustilago maydis, as judged by IC50 values. The implications for fungicide mode of action and application are discussed.
U2 - 10.1006/bbrc.2001.5010
DO - 10.1006/bbrc.2001.5010
M3 - Article
SN - 1090-2104
VL - 284
SP - 845
EP - 849
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 3
ER -