Ferredoxin-thioredoxin reductase: A catalytically active dithiol group links photoreduced ferredoxin to thioredoxin functional in photosynthetic enzyme regulation

The mechanism by which the ferredoxin-thioredoxin system activates the target enzyme, NADP-malate dehydrogenase, was investigated by analyzing the sulfhydryl status of individual protein components with [ 14C]iodoacetate and monobromobimane. The data indicate that ferredoxin-thioredoxin reductase (F...

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Veröffentlicht in:Arch. Biochem. Biophys.; (United States) 1987-07, Vol.256 (1), p.372-380
Hauptverfasser: Droux, M., Miginiac-Maslow, M., Jacquot, J.-P., Gadal, P., Crawford, N.A., Kosower, N.S., Buchanan, B.B.
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container_title Arch. Biochem. Biophys.; (United States)
container_volume 256
creator Droux, M.
Miginiac-Maslow, M.
Jacquot, J.-P.
Gadal, P.
Crawford, N.A.
Kosower, N.S.
Buchanan, B.B.
description The mechanism by which the ferredoxin-thioredoxin system activates the target enzyme, NADP-malate dehydrogenase, was investigated by analyzing the sulfhydryl status of individual protein components with [ 14C]iodoacetate and monobromobimane. The data indicate that ferredoxin-thioredoxin reductase (FTR)—an iron-sulfur enzyme present in oxygenic photosynthetic organisms—is the first member of a thiol chain that links light to enzyme regulation. FTR possesses a catalytically active dithiol group localized on the 13 kDa (similar) subunit, that occurs in all species investigated and accepts reducing equivalents from photoreduced ferredoxin and transfers them stoichiometrically to the disulfide form of thioredoxin m. The reduced thioredoxin m, in turn, reduces NADP-malate dehydrogenase, thereby converting it from an inactive (S-S) to an active (SH) form. The means by which FTR is able to combine electrons (from photoreduced ferredoxin) with protons (from the medium) to reduce its active disulfide group remains to be determined.
doi_str_mv 10.1016/0003-9861(87)90458-9
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Biochem. Biophys.; (United States)</title><addtitle>Arch Biochem Biophys</addtitle><description>The mechanism by which the ferredoxin-thioredoxin system activates the target enzyme, NADP-malate dehydrogenase, was investigated by analyzing the sulfhydryl status of individual protein components with [ 14C]iodoacetate and monobromobimane. The data indicate that ferredoxin-thioredoxin reductase (FTR)—an iron-sulfur enzyme present in oxygenic photosynthetic organisms—is the first member of a thiol chain that links light to enzyme regulation. FTR possesses a catalytically active dithiol group localized on the 13 kDa (similar) subunit, that occurs in all species investigated and accepts reducing equivalents from photoreduced ferredoxin and transfers them stoichiometrically to the disulfide form of thioredoxin m. The reduced thioredoxin m, in turn, reduces NADP-malate dehydrogenase, thereby converting it from an inactive (S-S) to an active (SH) form. 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derivatives</topic><topic>Toluene - analysis</topic><topic>TRACER TECHNIQUES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Droux, M.</creatorcontrib><creatorcontrib>Miginiac-Maslow, M.</creatorcontrib><creatorcontrib>Jacquot, J.-P.</creatorcontrib><creatorcontrib>Gadal, P.</creatorcontrib><creatorcontrib>Crawford, N.A.</creatorcontrib><creatorcontrib>Kosower, N.S.</creatorcontrib><creatorcontrib>Buchanan, B.B.</creatorcontrib><creatorcontrib>Universite de Paris-Sud, Orsay, France</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>OSTI.GOV</collection><jtitle>Arch. 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Biophys.; (United States)</jtitle><addtitle>Arch Biochem Biophys</addtitle><date>1987-07-01</date><risdate>1987</risdate><volume>256</volume><issue>1</issue><spage>372</spage><epage>380</epage><pages>372-380</pages><issn>0003-9861</issn><eissn>1096-0384</eissn><coden>ABBIA4</coden><abstract>The mechanism by which the ferredoxin-thioredoxin system activates the target enzyme, NADP-malate dehydrogenase, was investigated by analyzing the sulfhydryl status of individual protein components with [ 14C]iodoacetate and monobromobimane. The data indicate that ferredoxin-thioredoxin reductase (FTR)—an iron-sulfur enzyme present in oxygenic photosynthetic organisms—is the first member of a thiol chain that links light to enzyme regulation. FTR possesses a catalytically active dithiol group localized on the 13 kDa (similar) subunit, that occurs in all species investigated and accepts reducing equivalents from photoreduced ferredoxin and transfers them stoichiometrically to the disulfide form of thioredoxin m. The reduced thioredoxin m, in turn, reduces NADP-malate dehydrogenase, thereby converting it from an inactive (S-S) to an active (SH) form. The means by which FTR is able to combine electrons (from photoreduced ferredoxin) with protons (from the medium) to reduce its active disulfide group remains to be determined.</abstract><cop>San Diego, CA</cop><pub>Elsevier Inc</pub><pmid>3606128</pmid><doi>10.1016/0003-9861(87)90458-9</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-4975-8587</orcidid><orcidid>https://orcid.org/0000-0001-5635-2046</orcidid></addata></record>
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ispartof Arch. Biochem. Biophys.; (United States), 1987-07, Vol.256 (1), p.372-380
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subjects 550201 - Biochemistry- Tracer Techniques
ALKYLATED AROMATICS
Applied sciences
AROMATICS
BARYONS
BASIC BIOLOGICAL SCIENCES
BIOLOGICAL FUNCTIONS
CARBON 14 COMPOUNDS
CATALYSIS
CHEMICAL REACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENZYMES
Exact sciences and technology
FERMIONS
FERREDOXIN
Ferredoxins - analysis
FUNCTIONS
HADRONS
HYDROCARBONS
Iron-Sulfur Proteins
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LEPTONS
Life Sciences
Light
Malate Dehydrogenase - radiation effects
METALLOPROTEINS
NUCLEONS
ORGANIC COMPOUNDS
Other techniques and industries
Oxidation-Reduction - radiation effects
OXIDOREDUCTASES
Oxidoreductases - metabolism
Oxidoreductases - radiation effects
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
Plants - enzymology
PROTEINS
PROTONS
REDOX REACTIONS
Space life sciences
STOICHIOMETRY
Sulfhydryl Compounds - analysis
SYNTHESIS
Thioredoxins - analysis
TOLUENE
Toluene - analogs & derivatives
Toluene - analysis
TRACER TECHNIQUES
title Ferredoxin-thioredoxin reductase: A catalytically active dithiol group links photoreduced ferredoxin to thioredoxin functional in photosynthetic enzyme regulation
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