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Dissertations / Theses on the topic 'Protochlorophyllide'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Proudfoot, Andrew William. "Structural studies of NADPH : protochlorophyllide oxidoreductase." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574533.

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The light driven enzyme Protochlorophyllide Oxidoreductase (POR) is responsible for catalysing the reduction of the Cl7 – C18 double bond of the D ring of protochlorophyllide (Pchlide), in the presence of NADPH, forming chlorophyllide (Chlide). The reduction of Pchlide involves a light-induced hydride transfer reaction from the pro-S face of nicotinamide adenine dinucleotide phosphate (NADPH) to the C'7 position, coupled to the addition of a proton to the C'8 position forming Chlide. The reaction catalysed by POR is a key step in chlorophyll biosynthesis and is essential in the development of

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2

Walker, C. J. "The photoreduction of protochlorophyllide and greening." Thesis, University of Bristol, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375393.

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3

Kay, S. A. "Photoregulation of the levels of protochlorophyllide reductase." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354460.

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4

Townley, Helen Elizabeth. "The purification and molecular characterization of protochlorophyllide oxidoreductase." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246265.

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5

Soffe, Mark S. "ATP Usage in the Dark-Operative Protochlorophyllide Oxidoreductase." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4753.

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Photosynthesis is a fundamental biological process that sustains life on earth. Chlorophyll is the pigment that captures sunlight and converts it to chemical energy through photosynthesis. These essential light-harvesting compounds are found in photosynthetic plants, cyanobacteria, green algae, angiosperms and gymnosperms. In the chlorophyll biosynthetic pathway, protochlorophyllide (Pchlide) serves as the precursor molecule for chlorophyll. Protochlorophyllide oxidoreductases are a class of enzymes that catalyze the conversion of Pchlide to chlorophyllide a (Chlide), which subsequently is red

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6

Kovacevic, Dragan. "Phototransformation de la protochlorophyllide en chlorophyllide et les effets des facteurs externes chez des feuilles d'orge étiolées /." Montréal : Université du Québec à Montréal, 2005. http://accesbib.uqam.ca/cgi-bin/bduqam/transit.pl?&noMan=24249680.

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7

Rowe, Jeremy Dean. "Protochlorophyllide reductase in cyanobacteria and its role in chlorophyll synthesis." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294428.

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8

Fredericks, Mark Christopher. "Characterisation of the light independent reduction of protochlorophyllide in photosynthetic bacteria." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390132.

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9

Hoeven, Robin. "Investigating the contribution of protein dynamics to catalysis in protochlorophyllide oxidoreductase." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/investigating-the-contribution-of-protein-dynamics-to-catalysis-in-protochlorophyllide-oxidoreductase(029dda21-023f-4fdb-a980-26db7eab4833).html.

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Enzyme dynamics has been established to play a crucial role in catalysis, and it has therefore become an important area of research to better understand enzymatic rate enhancements. The light-activated enzyme protochlorophyllide oxidoreductase (POR) is a well-studied model system where dynamics are known to be important for catalysis. The catalytic reaction involves a sequential hydride and proton transfer to reduce the C17-C18 double bond in the protochlorophyllide (Pchlide) substrate with NADPH as a cofactor to yield the chlorophyllide (Chlide) product. Both H-transfer steps are established

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10

Armstrong, David. "Structural and functional studies of the light-dependent protochlorophyllide oxidoreductase enzyme." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/8424/.

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The light dependent enzyme protochlorophyllide oxidoreductase (POR) is a key enzyme in the chlorophyll biosynthesis pathway, catalysing the reduction of the C17 C18 bond in protochlorophyllide (Pchlide) to form chlorophyllide (Chlide). This reaction involves the light-induced transfer of a hydride from the nicotinamide adenine dinucleotide phosphate (NADPH) cofactor, followed by proton transfer from a catalytic tyrosine residue. Much work has been done to elucidate the catalytic mechanism of POR, however little is known about the protein structure. POR isoforms in plants are also notable as co

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11

Bolling, Laurence. "Etude in vivo de la fonction de la Protochlorophyllide Oxydoreductase A chez Arabidopsis thaliana." Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00256027.

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Si les gymnospermes, les mousses, ou encore les algues vertes sont capables de verdir à l'obscurité, ce n'est pas le cas des angiospermes. Chez ces derniers, la voie de biosynthèse de la chlorophylle est bloquée au niveau de la pénultième étape qui correspond à la réduction de la protochlorophyllide en chlorophyllide. Cette réaction est catalysée par la NADPH : protochlorophyllide oxydoréductase (POR) dont l'activité est strictement dépendante de la lumière. Chez Arabidopsis thaliana, trois isoformes, PORA, PORB et PORC, ont été identifiées. Nous avons décidé d'étudier de façon systématique l'

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12

Holtorf, Hauke. "Isolation and characterization of a novel NADPH-protochlorophyllide oxidoreductase (PORB) from barley (Hordeum vulgare L.) /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11250.

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13

Binuraj, Menon R. K. "Kinetic and mechanistic studies of the light activated enzyme Protochlorophyllide oxidoreductase (POR) by protein engineering." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509723.

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14

Durin, Guillaume. "Mécanisme catalytique de la protochlorophyllide oxydoréductase : étude du couplage entre activité fonctionnelle et dynamique de la protéine." Phd thesis, Université Joseph Fourier (Grenoble), 2005. http://tel.archives-ouvertes.fr/tel-00011429.

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La protochlorophyllide oxydoréductase catalyse la réduction de la protochlorophyllide en chlorophyllide, pénultième étape de la synthèse de la chlorophylle chez les plantes. Cette réaction présente la particularité d'être photoactivable. Après le déclenchement de la réaction par la lumière, plusieurs intermédiaires réactionnels apparaissent, présentant des signatures spectroscopiques distinctes. L'étude du mécanisme catalytique à basse température permet d'isoler chacun de ces intermédiaires et de les caractériser. <br /><br />Nous avons d'abord mis en évidence que la longueur d'onde et l'inte

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15

Paddock, Troy N. "Genetic manipulation of NADPH: Protochlorophyllide Oxidoreductase content in Arabidopsis reveals essential roles in prolamellar body formation and plant development." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211899658.

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16

Samól, Iga. "Implications de la protéine OEP16 dans la photoprotection d’Arabidopsis thaliana lors du stress lumineux." Grenoble 1, 2009. https://theses.hal.science/tel-00764372.

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Chez les angiospermes, l'oxygène singulet est la forme majoritaire des espèces réactives de l'oxygène, étant produite lors de la photosynthèse. Son excès provoque le dommage photo-oxydatif conduisant à la mort cellulaire, observée chez les mutants affectés dans la voie de la biosynthèse de la chlorophylle. Dans ce travail, nous avons utilisé des mutants d'Arabidopsis thaliana qui manifestent le phénotype conditionnel de la mort cellulaire, causée par l'absence d'une protéine de l'enveloppe externe des plastes, OEP16-1. Cette protéine est impliquée dans le transport des amines, acides aminés et

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17

Harris, Kelvin. "Understanding the NifM dependence of NifH in Azotobacter vinelandii functional substitution of NifH by a NifH-ChlL chimeric construct in a NifM- strain /." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-07062007-110702.

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18

Geiges, Bernd. "Regulation der Protochlorophyllid Oxidoreduktase Gene A und B aus Arabidopsis thaliana /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13659.

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19

Fey, Sonja [Verfasser], Gudrun [Akademischer Betreuer] Hermann, Ralf [Akademischer Betreuer] Oelmüller, and Sven [Akademischer Betreuer] Rau. "Enzymkatalyse in verschiedenen Formen der lichtabhängigen NADPH : Protochlorophyllid-Oxidoreduktase / Sonja Fey. Gutachter: Gudrun Hermann ; Ralf Oelmüller ; Sven Rau." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2012. http://d-nb.info/1019124806/34.

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20

Schneidewind, Judith [Verfasser], and Karl-Erich [Gutachter] Jaeger. "Phylogenie, Evolution und strukturelle Basis der lichtabhängigen Protochlorophyllid Reduktion in aerob anoxygenen phototrophen Bakterien / Judith Schneidewind ; Gutachter: Karl-Erich Jaeger." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2020. http://d-nb.info/1204634718/34.

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21

Shen, Fang Bryant Donald A. "Purification and kinetic characterization of protochlorophyllide a divinyl reductase in green sulfur bacterium chlorobium tepidum." 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2956/index.html.

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22

Samol, Iga. "Implications de la protéine OEP16 dans la photoprotéction d'Arabidopsis thaliana lors du stress lumineux." Phd thesis, 2009. http://tel.archives-ouvertes.fr/tel-00764372.

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Chez les angiospermes, l'oxygène singulet est la forme majoritaire des espèces réactives de l'oxygène, étant produite lors de la photosynthèse. Son excès provoque le dommage photooxidatif conduisant à la mort cellulaire, observée chez les mutants affectés dans la voie de la biosynthèse de la chlorophylle. Dans ce travail, nous avons utilisé des mutants d'Arabidopsis thaliana qui manifestent le phénotype conditionnel de la mort cellulaire, causée par l'absence d'une protéine de l'enveloppe externe des plastes, OEP16-1. Cette protéine est impliquée dans le transport des amines, acides aminés et

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23

KOPEČNÁ, Jana. "Regulation of the chlorophyll biosynthesis in the cyanobacterium \kur{Synechocystis} sp. PCC 6803." Doctoral thesis, 2012. http://www.nusl.cz/ntk/nusl-135192.

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The thesis focuses on regulation of the chlorophyll biosynthetic pathway and its coordination with synthesis of chlorophyll-binding proteins in the cyanobacterium Synechocystis sp. PCC 6803. One of the aims was to analyze correlation between syntheses of photosystems and chlorophyll in Synechocystis cells using radioactive labeling of proteins and chlorophyll by 35S and 14C, respectively. I also investigated the role of enzymes catalyzing protochlorophyllide reduction step in the chlorophyll biosynthesis by analyzing the synthesis and accumulation of photosynthetic proteins in Synechocystis mu

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24

Klement, Harald [Verfasser]. "NADPH: Protochlorophyllid-Oxidoreduktase (POR) : Untersuchungen zu einem "Schlüsselenzym" der Chlorophyll-Biosynthese in Angiospermen / vorgelegt von Harald Klement." 2000. http://d-nb.info/963103334/34.

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