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Cytochrome b of fish mitochondria is strongly resistant to funiculosin, a powerful inhibitor of respiration

Identifieur interne : 000A22 ( Istex/Corpus ); précédent : 000A21; suivant : 000A23

Cytochrome b of fish mitochondria is strongly resistant to funiculosin, a powerful inhibitor of respiration

Auteurs : Mauro Degli Esposti ; Anna Ghelli ; Massimo Crimi ; Alessandra Baracca ; Giancarlo Solaini ; Thierry Tron ; Axel Meyer

Source :

RBID : ISTEX:A2484CB35239548DD4EB34F32FFF902C517A7480

Abstract

We report here some unusual properties of ubiquinol: cytochrome c reductase of eel and other fish mitochondria. The turnover rate of the reductase is clearly higher than in mammalian mitochondria and the binding constant for ubiquinone seems to be larger than in other vertebrates. Additionally, the reductase activity of fish mitochondria is resistant to some powerful inhibitors that bind to cytochrome b, in particular to funiculosin. After sequencing most of the gene of eel cytochrome b and comparing the deduced amino acid sequence with that of other fish and animals, we hypothesize that the decreased binding of funiculosin could be due to a few amino acid replacements in the third and fourth transmembrane helix of the protein. In particular, the presence of methionine instead of alanine at position 125 seems to be largely responsible for the strong resistance to funiculosin and also to the partial resistance to myxothiazol in all fish mitochondria. Correlations between some residue substitutions in cytochrome b and the different effects of funiculosin in different species are also considered.

Url:
DOI: 10.1016/0003-9861(92)90506-R

Links to Exploration step

ISTEX:A2484CB35239548DD4EB34F32FFF902C517A7480

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<ce:copyright type="unknown" year="1992"></ce:copyright>
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<ce:doctopic>
<ce:text>Biological oxidations, bioenergetics, and P450 reactions</ce:text>
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<ce:title>Cytochrome b of fish mitochondria is strongly resistant to funiculosin, a powerful inhibitor of respiration</ce:title>
<ce:author-group>
<ce:author>
<ce:given-name>Mauro Degli</ce:given-name>
<ce:surname>Esposti</ce:surname>
<ce:cross-ref refid="COR1">
<ce:sup loc="post">1</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author>
<ce:given-name>Anna</ce:given-name>
<ce:surname>Ghelli</ce:surname>
<ce:cross-ref refid="AFF1">
<ce:sup loc="post">a</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author>
<ce:given-name>Massimo</ce:given-name>
<ce:surname>Crimi</ce:surname>
</ce:author>
<ce:author>
<ce:given-name>Alessandra</ce:given-name>
<ce:surname>Baracca</ce:surname>
</ce:author>
<ce:author>
<ce:given-name>Giancarlo</ce:given-name>
<ce:surname>Solaini</ce:surname>
<ce:cross-ref refid="AFF2">
<ce:sup loc="post"></ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author>
<ce:given-name>Thierry</ce:given-name>
<ce:surname>Tron</ce:surname>
<ce:cross-ref refid="FN1">
<ce:sup loc="post">2</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author>
<ce:given-name>Axel</ce:given-name>
<ce:surname>Meyer</ce:surname>
<ce:cross-ref refid="AFF3">
<ce:sup loc="post"></ce:sup>
</ce:cross-ref>
</ce:author>
<ce:affiliation id="AFF1">
<ce:label>a</ce:label>
<ce:textfn>Laboratory of Biochemistry and Biophysics, Department of Biology, University of Bologna, Via Irnerio 42, 40126 Bologna, Italy</ce:textfn>
</ce:affiliation>
<ce:affiliation id="AFF2">
<ce:label></ce:label>
<ce:textfn>Scuola Superiore di Studi Universitari e Perfezionamento S. Anna, Pisa, Italy</ce:textfn>
</ce:affiliation>
<ce:affiliation id="AFF3">
<ce:label></ce:label>
<ce:textfn>Department of Ecology and Evolution, Division of Biological Sciences, State University of New York at Stony Brook, Stony Brook, New York 11794-5245 USA</ce:textfn>
</ce:affiliation>
<ce:correspondence id="COR1">
<ce:label>1</ce:label>
<ce:text>To whom correspondence should be addressed.</ce:text>
</ce:correspondence>
<ce:footnote id="FN1">
<ce:label>2</ce:label>
<ce:note-para>On leave from Unité de Métabolisme Energétique, LCB-CNRS, Marseille, France.</ce:note-para>
</ce:footnote>
</ce:author-group>
<ce:date-received day="25" month="11" year="1991"></ce:date-received>
<ce:date-revised day="23" month="1" year="1992"></ce:date-revised>
<ce:abstract class="author">
<ce:section-title>Abstract</ce:section-title>
<ce:abstract-sec>
<ce:simple-para view="all" id="simple-para.0010">We report here some unusual properties of ubiquinol: cytochrome c reductase of eel and other fish mitochondria. The turnover rate of the reductase is clearly higher than in mammalian mitochondria and the binding constant for ubiquinone seems to be larger than in other vertebrates. Additionally, the reductase activity of fish mitochondria is resistant to some powerful inhibitors that bind to cytochrome b, in particular to funiculosin. After sequencing most of the gene of eel cytochrome b and comparing the deduced amino acid sequence with that of other fish and animals, we hypothesize that the decreased binding of funiculosin could be due to a few amino acid replacements in the third and fourth transmembrane helix of the protein. In particular, the presence of methionine instead of alanine at position 125 seems to be largely responsible for the strong resistance to funiculosin and also to the partial resistance to myxothiazol in all fish mitochondria. Correlations between some residue substitutions in cytochrome b and the different effects of funiculosin in different species are also considered.</ce:simple-para>
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<abstract lang="en">We report here some unusual properties of ubiquinol: cytochrome c reductase of eel and other fish mitochondria. The turnover rate of the reductase is clearly higher than in mammalian mitochondria and the binding constant for ubiquinone seems to be larger than in other vertebrates. Additionally, the reductase activity of fish mitochondria is resistant to some powerful inhibitors that bind to cytochrome b, in particular to funiculosin. After sequencing most of the gene of eel cytochrome b and comparing the deduced amino acid sequence with that of other fish and animals, we hypothesize that the decreased binding of funiculosin could be due to a few amino acid replacements in the third and fourth transmembrane helix of the protein. In particular, the presence of methionine instead of alanine at position 125 seems to be largely responsible for the strong resistance to funiculosin and also to the partial resistance to myxothiazol in all fish mitochondria. Correlations between some residue substitutions in cytochrome b and the different effects of funiculosin in different species are also considered.</abstract>
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