Novel functions of an iron-sulfur flavoprotein from Trichomonas vaginalis hydrogenosomes.

Abstract:

:Iron-sulfur flavoproteins (Isf) are flavin mononucleotide (FMN)- and FeS cluster-containing proteins commonly encountered in anaerobic prokaryotes. However, with the exception of Isf from Methanosarcina thermophila, which participates in oxidative stress management by removing oxygen and hydrogen peroxide, none of these proteins has been characterized in terms of function. Trichomonas vaginalis, a sexually transmitted eukaryotic parasite of humans, was found to express several iron-sulfur flavoprotein (TvIsf) homologs in its hydrogenosomes. We show here that in addition to having oxygen-reducing activity, the recombinant TvIsf also functions as a detoxifying reductase of metronidazole and chloramphenicol, both of which are antibiotics effective against a variety of anaerobic microbes. TvIsf can utilize both NADH and reduced ferredoxin as electron donors. Given the prevalence of Isf in anaerobic prokaryotes, we propose that these proteins are central to a novel defense mechanism against xenobiotics.

authors

Smutná T,Pilarová K,Tarábek J,Tachezy J,Hrdý I

doi

10.1128/AAC.02320-13

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

3224-32

issue

6

eissn

0066-4804

issn

1098-6596

pii

AAC.02320-13

journal_volume

58

pub_type

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