Browse
Submit Data
Databases
API
Help

Dataset Information

295 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

PSI-PSII complexes - Two types of photosystem reaction centers (PSI and PSII) are physically connected each other in Arabidopsis. Excitation energy is transferred efficiently between the two closely interacting reaction centers.

ABSTRACT: Two types of photosystem reaction centers (PSI and PSII) are physically connected each other in Arabidopsis. Excitation energy is transferred efficiently between the two closely interacting reaction centers.

INSTRUMENT(S):

ORGANISM(S): Arabidopsis Thaliana (mouse-ear Cress)

TISSUE(S): Leaf

SUBMITTER: Makio Yokono

LAB HEAD: Ayumi Tanaka

PROVIDER: PXD001803 | Pride | 2016-05-26

REPOSITORIES: Pride

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
	2014102004.CSV	Csv
	2014102004.raw	Raw
	2014102023.CSV	Csv
	2014102023.raw	Raw
	2014102025.CSV	Csv

Items per page:

1 - 5 of 12

Similar Datasets

Excitonic interactions in wild-type and mutant PSI reaction centers.

Project description:Femtosecond excitation of the red edge of the chlorophyll a Q(Y) transition band in photosystem I (PSI), with light of wavelength > or = 700 nm, leads to wide transient (subpicosecond) absorbance changes: positive DeltaA between 635 and 665 nm, and four negative DeltaA bands at 667, 675, 683, and 695 nm. Here we compare the transient absorbance changes after excitation at 700, 705, and 710 nm at 20 K in several PSI preparations of Chlamydomonas reinhardtii where amino acid ligands of the primary donor, primary acceptor, or connecting chlorophylls have been mutated. Most of these mutations influence the spectrum of the absorbance changes. This supports the view that the chlorophylls of the electron transfer chain as well as the connecting chlorophylls are engaged in the observed absorbance changes. The wide absorption spectrum of the electron transfer chain revealed by the transient measurements may contribute to the high efficiency of energy trapping in photosystem 1. Exciton calculations, based on the recent PSI structure, allow an assignment of the DeltaA bands to particular chlorophylls: the bands at 675 and 695 nm to the dimers of primary acceptor and accessory chlorophyll and the band at 683 nm to the connecting chlorophylls. The subpicosecond transient absorption bands decay may reflect rapid charge separation in the PSI reaction center.

| S-EPMC1303478 | biostudies-literature

Expression data from 5 rhesus tissues at 3 centers

Project description:Novel approaches were used to generate the DNA sequence information for the rhesus GeneChip (2005). The purpose of this experiment was to test its reliability and validity of the rhesus macaque GeneChip across different tissues and centers. Keywords: reliability To test the reliability of the rhesus GeneChip across different centers, RNA was isolated from five sources: cerebral cortex, pancreas, thymus, testis, and an immortalized fibroblast cell line. Aliquots of this RNA were sent to each of three centers: Yerkes National Primate Research Center, Oregon National Primate Research Center and the University of Nebraska Medical Center. Each center labeled the samples and hybridized them to two rhesus macaque GeneChips.

2010-06-11 | E-GEOD-7094 | biostudies-arrayexpress

Low Light Facilitates Cyclic Electron Flows around PSI to Assist PSII against High Temperature Stress.

Project description:Photosystem II (PSII) of grapevine leaves is easily damaged under heat stress, but no such injury is observed when the leaves are heated in low light. To elucidate the mechanisms, we compared the photosynthetic characteristics of grapevine seedlings under heat treatments (42 °C) for 4 h in the dark or low light (200 μmol m-2 s-1). At 42 °C in the dark, the PSII maximum quantum yield (Fv/Fm) decreased significantly with the increase in time but did not change much in low light. The JIP (chlorophyll a fluorescence rise kinetics) test results showed that low light significantly alleviated the damage to the oxygen evolving complexes (OECs; the K-step was less visible) by heat stress. Further, in the presence of de novo D1 protein synthesis inhibitor chloramphenicol, Fv/Fm did not differ significantly between dark and light treatments under heat stress. The 50% re-reduction (RR50) of P700+ on cessation of far-red illumination was faster after light treatment than that in the dark. After exposure to 25 °C in a low light for 15 min, Y(NO) (the constitutive non-regulatory non-photochemical quenching) treated by heat stress and darkness was higher than that by heat stress and light. Overall, our results suggested that enhanced CEFs around PSI in low light could assist PSII against heat damage by maintaining the rate of PSII repair and inhibiting the non-radiative charge recombination in PSII reaction centers.

| S-EPMC9788621 | biostudies-literature

Modeling the Role of LHCII-LHCII, PSII-LHCII, and PSI-LHCII Interactions in State Transitions.

Project description:The light-dependent reactions of photosynthesis take place in the plant chloroplast thylakoid membrane, a complex three-dimensional structure divided into the stacked grana and unstacked stromal lamellae domains. Plants regulate the macro-organization of photosynthetic complexes within the thylakoid membrane to adapt to changing environmental conditions and avoid oxidative stress. One such mechanism is the state transition that regulates photosynthetic light harvesting and electron transfer. State transitions are driven by changes in the phosphorylation of light harvesting complex II (LHCII), which cause a decrease in grana diameter and stacking, a decrease in energetic connectivity between photosystem II (PSII) reaction centers, and an increase in the relative LHCII antenna size of photosystem I (PSI) compared to PSII. Phosphorylation is believed to drive these changes by weakening the intramembrane lateral PSII-LHCII and LHCII-LHCII interactions and the intermembrane stacking interactions between these complexes, while simultaneously increasing the affinity of LHCII for PSI. We investigated the relative roles and contributions of these three types of interaction to state transitions using a lattice-based model of the thylakoid membrane based on existing structural data, developing a novel algorithm to simulate protein complex dynamics. Monte Carlo simulations revealed that state transitions are unlikely to lead to a large-scale migration of LHCII from the grana to the stromal lamellae. Instead, the increased light harvesting capacity of PSI is largely due to the more efficient recruitment of LHCII already residing in the stromal lamellae into PSI-LHCII supercomplexes upon its phosphorylation. Likewise, the increased light harvesting capacity of PSII upon dephosphorylation was found to be driven by a more efficient recruitment of LHCII already residing in the grana into functional PSII-LHCII clusters, primarily driven by lateral interactions.

| S-EPMC7376088 | biostudies-literature

NHGRI Mendelian Disorders Sequencing Centers

Project description:NHGRI Mendelian Disorders Sequencing Centers

| PRJNA158501 | ENA

Psychrotolerant bacterium Sphingomonas glacialis AAP5 harvests light energy using both proton-pumping xanthorhodopsins and bacteriochlorophyll-based reaction centers

Project description:Bacterium Sphingomonas glacialis AAP5 isolated from the alpine lake Gossenköllesee contains genes for anoxygenic phototrophy as well as proton-pumping xanthorhodopsin. Here we show that AAP5 expresses xanthorhodopsin when illuminated at temperatures below 16°C. In contrast bacteriochlorophyll-containing reaction centers are expressed between 4 and 22°C in the dark. Thus, cells grown at lower temperature under natural light-dark cycle produced both photosystems. The purified xanthorhodopsin contains carotenoid nostoxanthin serving as an auxiliary antenna and performs the standard photocycle. The xanthorhodopsin-containing cells reduced upon illumination their respiration, increased their ATP synthesis and produced more biomass. This documents that the harvested light energy was utilized in the metabolism, which can represent a competitive advance under carbon-limiting conditions. The presence of Sphingomonas bacteria with dual phototrophy was verified in the metagenomes collected from lake Gossenköllesee. This unique trait may represent a metabolic advantage in alpine lakes where photoheterotrophic organisms facelimited organic substrates, low temperature, and extreme changes in irradiance.

2022-05-10 | GSE196609 | GEO

Transcription profiling by array of kidney, liver and spleen across different centers - scien-affy-human-87089

Project description:Normal kidney, liver, spleen, and Universal RNA from Stratagene were expression profiled across five centers (UCLA, Duke, TGen, Children's National Medical Center in Washington, DC, and University of Pennsylvania) using the Affymetrix, spotted Operon, Agilent, and Amersham arrays to identify differences in expression between microarray platforms as well as centers. To compare the four microarray platforms as well as the reproducibility across the centers. There will be expression differences between the five centers. The following array types were profiled at the centers: UCLA: Affymetrix, Amersham, Agilent TGen: Affymetrix (3000 scanner) Children's: Affymetrix (2500 scanner) Duke: Operon Oligo University of Penn.: Affymetrix Series_author: Consortium,,Cross Platform Keywords: other. This dataset is part of the TransQST collection.

2004-11-24 | E-GEOD-2004 | biostudies-arrayexpress

Manufacturing Differences Affect Human Bone Marrow Stromal Cell Characteristics and Function: Comparison of Production Methods and Products from Multiple Centers

Project description:Human bone marrow stromal cells (BMSCs, also known as bone marrow-derived mesenchymal stem cells) are manufactured using many different methods, but little is known about the spectrum of manufacturing methods used and their effects on BMSC characteristics and function. Seven centers using, and one developing, Good Manufacturing Practices (GMP) processes were surveyed as to their production methods. Among the seven centers, all used marrow aspirates as the starting material, but no two centers used the same manufacturing methods. Two to four BMSC lots from each center were compared using global gene expression. Among the twenty-four BMSC lots from the eight centers intra-center transcriptome variability was low and similar among centers. Principal component and Unsupervised Hierarchical Clustering analysis separated all the lots from five centers into five distinct clusters. BMSCs from six of the eight centers were tested for their ability to form bone and support hematopoiesis by in vivo transplantation. Those from all six centers tested formed bone, but the quantity formed was variable highly and BMSCs from only three centers supported hematopoiesis. These results show that differences in manufacturing resulted in variable BMSC characteristics including their ability to form bone and support hematopoiesis.

2017-05-15 | GSE92640 | GEO

small RNA discovery in fission yeast Schizosaccharomyces japonicus

Project description:We used massively parallel sequencing to discover and characterize small RNAs (sRNAs) from fission yeast Schizosaccharomyces japonicus. We found that, unlike in related S. pombe, a substantial fraction of sRNAs maps to transposons, both telomeric and centromeric. small RNA library from total RNA isolations from Schizosaccharomyces japonicus

2012-07-26 | E-GEOD-26902 | biostudies-arrayexpress

Expression data from 5 rhesus tissues at 3 centers

2007-02-23 | GSE7094 | GEO