Mechanism of inhibition of purified leaping mullet (Liza saliens) NADPH-cytochrome P450 reductase by toxic metals: aluminum and thallium.

Abstract:

:Aluminum and thallium may reach life-threatening levels in aquatic systems in the near future because of their extensive use in various industrial fields. It is therefore important to study the mechanism of toxicity of aluminum and thallium on fish enzymes. To this aim, the effects of aluminum and thallium on the activity of purified leaping mullet (Liza saliens) cytochrome P450 reductase, an essential component of the important cytochrome P450 system, have been studied. Results indicated that both metal ions strongly inhibited the NADPH-cytochrome P450 reductase. The IC50 values of AlCl3 and TlCl3 were estimated to be 34 microM and 3 microM, respectively. The Lineweaver-Burk plot and Dixon plot revealed that both metal ions noncompetitively inhibited the purified mullet cytochrome P450 reductase. The K(i) values of Al3+ and Tl3+ were calculated from Dixon plots as 8.9 and 5.6 microM, respectively. The inhibitory effects of Al3+ and Tl3+ on purified cytochrome P450 reductase were partially recovered by 1 mM EDTA. Additionally, tin and magnesium were shown to have no apparent effect on purified mullet cytochrome P450 reductase.

journal_name

J Biochem Mol Toxicol

authors

Bozcaarmutlu A

doi

10.1002/jbt.20200

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

340-7

issue

6

eissn

1095-6670

issn

1099-0461

journal_volume

21

pub_type

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