Thylakoïde

Résumé

pomme de pin Le thylakoïde [du grec thylakos, sac, et oides, semblable] (on peut aussi écrire : thylacoïde) est un ensemble de membranes présent chez les cyanobactéries et dans les chloroplastes où se déroule la phase photochimique (ou claire) de la photosynthèse. L'espace intérieur délimité par les membranes du thylakoïde s'appelle le lumen ou espace intrathylakoïdien. L'espace extérieur est le cytoplasme chez les cyanobactéries, ou le stroma des chloroplastes chez les Eucaryotes photosynthétiques. Il existe différents types de chlorophylle. Certains types de molécules de chlorophylle se trouvent dans la membrane des thylakoïdes et d'autres se trouvent dans des complexes moléculaires qui eux-mêmes forment des ensembles appelés photosystèmes. Parmi ces complexes moléculaires il y a des complexes collecteurs de lumière où se trouvent des molécules de chlorophylle a qui est un pigment photosynthétique. Certains des pigments présents voient leurs électrons excités par des photons. D'a

Source officielle

https://fr.wikipedia.org/wiki/Thylako%C3%AFde

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Publications associées (3)

Publications associées

Chargement

Personnes associées

Chargement

Unités associées

Chargement

Concepts associés (46)

Concepts associés

Chargement

Cours associés (7)

Le cours "Microbiologie pour l'ingénieur" couvre les processus microbiens principaux qui ont lieu dans l'environnement et dans des systèmes de traitement. Il présente les cycles des éléments qui sont catalysés par des microorganismes et qui ont un impact important sur la planète Terre.

Closely interfacing with bioengineering and medicine, this course provides foundational concepts in applying small-molecule chemical toolsets to probe the functions of living systems at the mechanistic and molecular level with emphasis placed on quantitative understanding and improving human health.

Basic course in biochemistry as well as cellular and molecular biology for non-life science students enrolling at the Master or PhD thesis level from various engineering disciplines. It reviews essential notions necessary for a training in biology-related engineering fields.

Afficher plus

Cours associés

Chargement

Séances de cours associées (11)

Séances de cours associées

Chargement

In this study, we analyzed multibilayer lipid-protein membranes composed of the photosynthetic light-harvesting complex II (LHCII; isolated from spinach [Spinacia oleracea]) and the plant lipids monogalcatosyldiacylglycerol and digalactosyldiacylglycerol. Two types of pigment-protein complexes were analyzed: those isolated from dark-adapted leaves (LHCII) and those from leaves preilluminated with high-intensity light (LHCII-HL). The LHCII-HL complexes were found to be partially phosphorylated and contained zeaxanthin. The results of the x-ray diffraction, infrared imaging microscopy, confocal laser scanning microscopy, and transmission electron microscopy revealed that lipid-LHCII membranes assemble into planar multibilayers, in contrast with the lipid-LHCII-HL membranes, which form less ordered structures. In both systems, the protein formed supramolecular structures. In the case of LHCII-HL, these structures spanned the multibilayer membranes and were perpendicular to the membrane plane, whereas in LHCII, the structures were lamellar and within the plane of the membranes. Lamellar aggregates of LHCII-HL have been shown, by fluorescence lifetime imaging microscopy, to be particularly active in excitation energy quenching. Both types of structures were stabilized by intermolecular hydrogen bonds. We conclude that the formation of trans-layer, rivet-like structures of LHCII is an important determinant underlying the spontaneous formation and stabilization of the thylakoid grana structures, since the lamellar aggregates are well suited to dissipate excess energy upon overexcitation.

Amer Soc Plant Biologists2013

Chargement

PSII-LHCII Supercomplex Organizations in Photosynthetic Membrane by Coarse-Grained Simulation

Berend Smit

Green plant Photosystem II (PSII) and light-harvesting complex II (LHCLI) in the stacked grana regions of thylakoid membranes can self-organize into various PSII LHCII supercomplexes With crystalline Of fluid-like supramolecular structures to adjust themselves with external stimuli suth as high/low light and 'temperatures, reuclering tunable solar light absorption spectrum and photosynthesis efficiencies. However, the mechanisms controlling the PSII LHCH Supercomplex organizations remain elusive: In this work, We constructed a coarse-grained (CO) model of the thylakoid membrane including lipid molecules and a PSII LHCII supercomplex considering association/dissociation of moderately bound-LHCHs. The CG interaction between CG beads were constructed based on electron microscope (EM) experimental results, and we were able to Simulate the PSII LHCII supramolecular organization of a 500 X 500 nm(2) thylakoid membrane, which is compatible with experiments. Our CGMD simulations can successfully reproduce order structures of PSII LHCII supercomplexes under various protein packing fractions, free-LHCII:PSII ratios, and temperatures, thereby providing insights into mechanisms leading to PSH LHCII stipercornplex organizations in photosynthetic membranes.

Amer Chemical Soc2015

Chargement

Plastidic type I signal peptidase 1 is a redox-dependent thylakoidal processing peptidase

Jieping Zhu

Thylakoids are the photosynthetic membranes in chloroplasts and cyanobacteria. The aqueous phase inside the thylakoid known as the thylakoid lumen plays an essential role in the photosynthetic electron transport. The presence and significance of thiol-disulfide exchange in this compartment have been recognized but remain poorly understood. All proteins found free in the thylakoid lumen and some proteins associated to the thylakoid membrane require an N-terminal targeting signal, which is removed in the lumen by a membrane-bound serine protease called thylakoidal processing peptidase (TPP). TPP is homologous to Escherichia coli type I signal peptidase (SPI) called LepB. Genetic data indicate that plastidic SPI 1 (Plsp1) is the main TPP in Arabidopsis thaliana (Arabidopsis) although biochemical evidence had been lacking. Here we demonstrate catalytic activity of bacterially produced Arabidopsis Plsp1. Recombinant Plsp1 showed processing activity against various TPP substrates at a level comparable to that of LepB. Plsp1 and LepB were also similar in the pH optima, sensitivity to arylomycin variants and a preference for the residue at -3 to the cleavage site within a substrate. Plsp1 orthologs found in angiosperms contain two unique Cys residues located in the lumen. Results of processing assays suggested that these residues were redox active and formation of a disulfide bond between them was necessary for the activity of recombinant Arabidopsis Plsp1. Furthermore, Plsp1 in Arabidopsis and pea thylakoids migrated faster under non-reducing conditions than under reducing conditions on SDS-PAGE. These results underpin the notion that Plsp1 is a redoxdependent signal peptidase in the thylakoid lumen.

Wiley-Blackwell2014

Chargement