0000000000211409

AUTHOR

Sandra Barthel

showing 2 related works from this author

Thermostability of Two Cyanobacterial GrpE Thermosensors

2011

GrpE proteins act as co-chaperones for DnaK heat-shock proteins. The dimeric protein unfolds under heat stress conditions, which results in impaired interaction with a DnaK protein. Since interaction of GrpE with DnaK is crucial for the DnaK chaperone activity, GrpE proteins act as a thermosensor in bacteria. Here we have analyzed the thermostability and function of two GrpE homologs of the mesophilic cyanobacterium Synechocystis sp. PCC 6803 and of the thermophilic cyanobacterium Thermosynechococcus elongatus BP1. While in Synechocystis an N-terminal helix pair of the GrpE dimer appears to be the thermosensing domain and mainly mediates GrpE dimerization, the C-terminal four-helix bundle i…

PhysiologyMolecular Sequence DataProtein domainPlant SciencePlasma protein bindingCyanobacteriaProtein structureBacterial ProteinsHeat shock proteinEscherichia coliAmino Acid SequencePeptide sequenceHeat-Shock ProteinsThermostabilitySequence Homology Amino AcidbiologyProtein StabilityChemistryCircular DichroismGenetic Complementation TestSynechocystisSynechocystisTemperatureCell BiologyGeneral Medicinebiology.organism_classificationProtein Structure TertiaryCross-Linking ReagentsChaperone (protein)Biophysicsbiology.proteinbacteriaProtein MultimerizationProtein BindingPlant and Cell Physiology
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Thylakoid Membrane Maturation and PSII Activation Are Linked in Greening Synechocystis sp. PCC 6803 Cells

2013

Abstract Thylakoid membranes are typical and essential features of both chloroplasts and cyanobacteria. While they are crucial for phototrophic growth of cyanobacterial cells, biogenesis of thylakoid membranes is not well understood yet. Dark-grown Synechocystis sp. PCC 6803 cells contain only rudimentary thylakoid membranes but still a relatively high amount of phycobilisomes, inactive photosystem II and active photosystem I centers. After shifting dark-grown Synechocystis sp. PCC 6803 cells into the light, “greening” of Synechocystis sp. PCC 6803 cells, i.e. thylakoid membrane formation and recovery of photosynthetic electron transport reactions, was monitored. Complete restoration of a t…

Photosystem IIPhysiologyChemistryCytochrome b6f complexfood and beveragesLight-harvesting complexes of green plantsmacromolecular substancesPlant SciencePhotosystem IBiochemistryLight-dependent reactionsThylakoidQuantasomepolycyclic compoundsGeneticsBiophysicsPhotosystemPlant Physiology
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