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In vivo fluorescent detection of Fe-S clusters coordinated by human GRX2.

Identifieur interne : 000B14 ( Main/Exploration ); précédent : 000B13; suivant : 000B15

In vivo fluorescent detection of Fe-S clusters coordinated by human GRX2.

Auteurs : Kevin G. Hoff [États-Unis] ; Stephanie J. Culler ; Peter Q. Nguyen ; Ryan M. Mcguire ; Jonathan J. Silberg ; Christina D. Smolke

Source :

RBID : pubmed:20064440

Descripteurs français

English descriptors

Abstract

A major challenge to studying Fe-S cluster biosynthesis in higher eukaryotes is the lack of simple tools for imaging metallocluster binding to proteins. We describe the first fluorescent approach for in vivo detection of 2Fe2S clusters that is based upon the complementation of Venus fluorescent protein fragments via human glutaredoxin 2 (GRX2) coordination of a 2Fe2S cluster. We show that Escherichia coli and mammalian cells expressing Venus fragments fused to GRX2 exhibit greater fluorescence than cells expressing fragments fused to a C37A mutant that cannot coordinate a metallocluster. In addition, we find that maximal fluorescence in the cytosol of mammalian cells requires the iron-sulfur cluster assembly proteins ISCU and NFS1. These findings provide evidence that glutaredoxins can dimerize within mammalian cells through coordination of a 2Fe2S cluster as observed with purified recombinant proteins.

DOI: 10.1016/j.chembiol.2009.11.011
PubMed: 20064440


Affiliations:


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Le document en format XML

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<term>Dimerization (MeSH)</term>
<term>Glutaredoxins (genetics)</term>
<term>Glutaredoxins (metabolism)</term>
<term>Humans (MeSH)</term>
<term>Iron (chemistry)</term>
<term>Luminescent Proteins (genetics)</term>
<term>Luminescent Proteins (metabolism)</term>
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<term>Dichroïsme circulaire (MeSH)</term>
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<term>Glutarédoxines (génétique)</term>
<term>Glutarédoxines (métabolisme)</term>
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<term>Microscopie de fluorescence (MeSH)</term>
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<term>Protéines de fusion recombinantes (métabolisme)</term>
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<div type="abstract" xml:lang="en">A major challenge to studying Fe-S cluster biosynthesis in higher eukaryotes is the lack of simple tools for imaging metallocluster binding to proteins. We describe the first fluorescent approach for in vivo detection of 2Fe2S clusters that is based upon the complementation of Venus fluorescent protein fragments via human glutaredoxin 2 (GRX2) coordination of a 2Fe2S cluster. We show that Escherichia coli and mammalian cells expressing Venus fragments fused to GRX2 exhibit greater fluorescence than cells expressing fragments fused to a C37A mutant that cannot coordinate a metallocluster. In addition, we find that maximal fluorescence in the cytosol of mammalian cells requires the iron-sulfur cluster assembly proteins ISCU and NFS1. These findings provide evidence that glutaredoxins can dimerize within mammalian cells through coordination of a 2Fe2S cluster as observed with purified recombinant proteins.</div>
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