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Dioxathiadiaza-heteropentalenes mediate superoxide and hydrogen peroxide production in Escherichia coli.

Abstract：

:The dioxathiadiaza-heteropentalenes, HEP-I (4,4-dimethyl-1,7-dioxa-2,6-diaza- 7 alpha lambda 4-thia-3H,5H-benzo[cd]pentalene), HEP-II (1,7-dioxa-2, 6-diaza-4, 7 alpha lambda 4-dithia-3H, 5H-benzo[cd]pentalene), HEP-III (1,7-dioxa-2,6-diaza-4, 7 alpha lambda 4-dithia-3H, 5H-benzo[cd]pentalene-4-oxide), and HEP-IV (1,7-dioxa-2,6-diaza-4,7 alpha lambda 4-dithia-3H, 5H-benzo[cd]pentalene-4,4-dioxide), inhibited growth of Escherichia coli in a simple glucose-salt medium, with their toxicities following the order of HEP-IV greater than HEP-III greater than HEP-II greater than HEP-I. These toxicities could be suppressed by yeast extract added to the glucose-salt medium. Yeast extract also facilitated maximal induction of superoxide dismutase (SOD) and catalase. The redox potentials of HEP-I-HEP-IV and the rates of oxygen uptake dependent on heteropentalenes in cyanide-resistant respiration of E. coli were correlated with the induction of SOD and catalase. Thus, the higher the redox potential of the compounds, the more potent they were for induction of enzyme production. Under anaerobic conditions, HEP-IV did not inhibit E. coli growth. These results indicate that HEP-I-HEP-IV can be reduced within the cell of E. coli and then reoxidized by molecular oxygen, generating O2- and H2O2. The toxicities of the heteropentalenes depend largely upon superoxide and/or hydrogen peroxide toxicity, and SOD and catalase provide a defense against the potential cytotoxicity of these species.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Takahashi M,Nagano T,Hirobe M

doi

10.1016/0003-9861(89)90574-2

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

137-43

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(89)90574-2

journal_volume

268

pub_type

杂志文章

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