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The structure and reactivity of the HoxEFU complex from the cyanobacterium Synechocystis sp. PCC 6803.

Identifieur interne : 000011 ( Main/Exploration ); précédent : 000010; suivant : 000012

The structure and reactivity of the HoxEFU complex from the cyanobacterium Synechocystis sp. PCC 6803.

Auteurs : Jacob H. Artz [États-Unis] ; Monika Tokmina-Lukaszewska [États-Unis] ; David W. Mulder [États-Unis] ; Carolyn E. Lubner [États-Unis] ; Kirstin Gutekunst [Allemagne] ; Jens Appel [Allemagne] ; Brian Bothner [États-Unis] ; Marko Boehm [Allemagne] ; Paul W. King

Source :

RBID : pubmed:32409585

Abstract

Cyanobacterial Hox is a [NiFe] hydrogenase that consists of the hydrogen (H2)-activating subunits HoxYH, which form a complex with the HoxEFU assembly to mediate reactions with soluble electron carriers like NAD(P)H and ferredoxin (Fdx), thereby coupling photosynthetic electron transfer to energy-transforming catalytic reactions. Researchers studying the HoxEFUYH complex have observed that HoxEFU can be isolated independently of HoxYH, leading to the hypothesis that HoxEFU is a distinct functional subcomplex rather than an artifact of Hox complex isolation. Moreover, outstanding questions about the reactivity of Hox with natural substrates and the site(s) of substrate interactions and coupling of H2, NAD(P)H, and Fdx remain to be resolved. To address these questions, here we analyzed recombinantly produced HoxEFU by electron paramagnetic resonance spectroscopy and kinetic assays with natural substrates. The purified HoxEFU subcomplex catalyzed electron transfer reactions among NAD(P)H, flavodoxin, and several ferredoxins, thus functioning in vitro as a shuttle among different cyanobacterial pools of reducing equivalents. Both Fdx1-dependent reductions of NAD+ and NADP+ were cooperative. HoxEFU also catalyzed the flavodoxin-dependent reduction of NAD(P)+, Fdx2-dependent oxidation of NADH and Fdx4- and Fdx11-dependent reduction of NAD+ MS-based mapping identified an Fdx1-binding site at the junction of HoxE and HoxF, adjacent to iron-sulfur (FeS) clusters in both subunits. Overall, the reactivity of HoxEFU observed here suggests that it functions in managing peripheral electron flow from photosynthetic electron transfer, findings that reveal detailed insights into how ubiquitous cellular components may be used to allocate energy flow into specific bioenergetic products.

DOI: 10.1074/jbc.RA120.013136
PubMed: 32409585
PubMed Central: PMC7363133


Affiliations:


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<div type="abstract" xml:lang="en">Cyanobacterial Hox is a [NiFe] hydrogenase that consists of the hydrogen (H
<sub>2</sub>
)-activating subunits HoxYH, which form a complex with the HoxEFU assembly to mediate reactions with soluble electron carriers like NAD(P)H and ferredoxin (Fdx), thereby coupling photosynthetic electron transfer to energy-transforming catalytic reactions. Researchers studying the HoxEFUYH complex have observed that HoxEFU can be isolated independently of HoxYH, leading to the hypothesis that HoxEFU is a distinct functional subcomplex rather than an artifact of Hox complex isolation. Moreover, outstanding questions about the reactivity of Hox with natural substrates and the site(s) of substrate interactions and coupling of H
<sub>2</sub>
, NAD(P)H, and Fdx remain to be resolved. To address these questions, here we analyzed recombinantly produced HoxEFU by electron paramagnetic resonance spectroscopy and kinetic assays with natural substrates. The purified HoxEFU subcomplex catalyzed electron transfer reactions among NAD(P)H, flavodoxin, and several ferredoxins, thus functioning
<i>in vitro</i>
as a shuttle among different cyanobacterial pools of reducing equivalents. Both Fdx1-dependent reductions of NAD
<sup>+</sup>
and NADP
<sup>+</sup>
were cooperative. HoxEFU also catalyzed the flavodoxin-dependent reduction of NAD(P)
<sup>+</sup>
, Fdx2-dependent oxidation of NADH and Fdx4- and Fdx11-dependent reduction of NAD
<sup>+</sup>
MS-based mapping identified an Fdx1-binding site at the junction of HoxE and HoxF, adjacent to iron-sulfur (FeS) clusters in both subunits. Overall, the reactivity of HoxEFU observed here suggests that it functions in managing peripheral electron flow from photosynthetic electron transfer, findings that reveal detailed insights into how ubiquitous cellular components may be used to allocate energy flow into specific bioenergetic products.</div>
</front>
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<ArticleTitle>The structure and reactivity of the HoxEFU complex from the cyanobacterium
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<AbstractText>Cyanobacterial Hox is a [NiFe] hydrogenase that consists of the hydrogen (H
<sub>2</sub>
)-activating subunits HoxYH, which form a complex with the HoxEFU assembly to mediate reactions with soluble electron carriers like NAD(P)H and ferredoxin (Fdx), thereby coupling photosynthetic electron transfer to energy-transforming catalytic reactions. Researchers studying the HoxEFUYH complex have observed that HoxEFU can be isolated independently of HoxYH, leading to the hypothesis that HoxEFU is a distinct functional subcomplex rather than an artifact of Hox complex isolation. Moreover, outstanding questions about the reactivity of Hox with natural substrates and the site(s) of substrate interactions and coupling of H
<sub>2</sub>
, NAD(P)H, and Fdx remain to be resolved. To address these questions, here we analyzed recombinantly produced HoxEFU by electron paramagnetic resonance spectroscopy and kinetic assays with natural substrates. The purified HoxEFU subcomplex catalyzed electron transfer reactions among NAD(P)H, flavodoxin, and several ferredoxins, thus functioning
<i>in vitro</i>
as a shuttle among different cyanobacterial pools of reducing equivalents. Both Fdx1-dependent reductions of NAD
<sup>+</sup>
and NADP
<sup>+</sup>
were cooperative. HoxEFU also catalyzed the flavodoxin-dependent reduction of NAD(P)
<sup>+</sup>
, Fdx2-dependent oxidation of NADH and Fdx4- and Fdx11-dependent reduction of NAD
<sup>+</sup>
MS-based mapping identified an Fdx1-binding site at the junction of HoxE and HoxF, adjacent to iron-sulfur (FeS) clusters in both subunits. Overall, the reactivity of HoxEFU observed here suggests that it functions in managing peripheral electron flow from photosynthetic electron transfer, findings that reveal detailed insights into how ubiquitous cellular components may be used to allocate energy flow into specific bioenergetic products.</AbstractText>
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<Keyword MajorTopicYN="N">HoxEFU</Keyword>
<Keyword MajorTopicYN="N">Synechocystis</Keyword>
<Keyword MajorTopicYN="N">bidirectional hydrogenase</Keyword>
<Keyword MajorTopicYN="N">cooperativity</Keyword>
<Keyword MajorTopicYN="N">diaphorase</Keyword>
<Keyword MajorTopicYN="N">electron paramagnetic resonance (EPR)</Keyword>
<Keyword MajorTopicYN="N">hydrogenase</Keyword>
<Keyword MajorTopicYN="N">kinetics</Keyword>
<Keyword MajorTopicYN="N">nickel</Keyword>
<Keyword MajorTopicYN="N">nickel-iron enzyme</Keyword>
<Keyword MajorTopicYN="N">photosynthesis</Keyword>
<Keyword MajorTopicYN="N">protein cross-linking</Keyword>
<Keyword MajorTopicYN="N">protein-protein interaction</Keyword>
</KeywordList>
<CoiStatement>Conflict of interest—The authors declare that they have no conflicts of interest with the contents of this article.</CoiStatement>
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