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Molecular Diffusion through Cyanobacterial Septal Junctions

Opened Access Molecular Diffusion through Cyanobacterial Septal Junctions

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Autor: Nieves Morión, Mercedes
Mullineaux, Conrad W.
Flores García, Enrique
Departamento: Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular
Fecha: 2017
Publicado en: mBio, 8 (1), e01756-16.1-e01756-16.5.
Tipo de documento: Artículo
Resumen: Heterocyst-forming cyanobacteria grow as filaments in which intercellular molecular exchange takes place. During the differentiation of N2-fixing heterocysts, regulators are transferred between cells. In the diazotrophic filament, vegetative cells that fix CO2 through oxygenic photosynthesis provide the heterocysts with reduced carbon and heterocysts provide the vegetative cells with fixed nitrogen. Intercellular molecular transfer has been traced with fluorescent markers, including calcein, 5-carboxyfluorescein, and the sucrose analogue esculin, which are observed to move down their concentration gradient. In this work, we used fluorescence recovery after photobleaching (FRAP) assays in the model heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 to measure the temperature dependence of intercellular transfer of fluorescent markers. We find that the transfer rate constants are directly proportional to the absolute temperature. This indicates that the “septal junctions” (f...
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Cita: Nieves Morión, M., Mullineaux, C.W. y Flores García, E. (2017). Molecular Diffusion through Cyanobacterial Septal Junctions. mBio, 8 (1), e01756-16.1-e01756-16.5.
Tamaño: 362.8Kb
Formato: PDF

URI: http://hdl.handle.net/11441/64053

DOI: 10.1128/mBio.01756-16

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