Specific Glucoside Transporters Influence Septal Structure and Function in the Filamentous, Heterocyst-Forming Cyanobacterium Anabaena sp. Strain PCC 7120

Nieves-Morión, Mercedes; Lechno-Yossef, Sigal; López-Igual, Rocío; Frías, José E.; Mariscal, Vicente; Nürnberg, Dennis J.; Mullineaux, Conrad W.; Wolk, C. Peter; Flores, Enrique

doi:10.1128/JB.00876-16

Specific Glucoside Transporters Influence Septal Structure and Function in the Filamentous, Heterocyst-Forming Cyanobacterium Anabaena sp. Strain PCC 7120

Journal Article · Mon Jan 16 23:00:00 EST 2017 · Journal of Bacteriology

DOI:https://doi.org/10.1128/JB.00876-16· OSTI ID:1474071

Nieves-Morión, Mercedes ^[1]; Lechno-Yossef, Sigal ^[2]; López-Igual, Rocío ^[3]; Frías, José E. ^[3]; Mariscal, Vicente ^[3]; Nürnberg, Dennis J. ^[4]; Mullineaux, Conrad W. ^[5]; Wolk, C. Peter ^[2]; ^[3]

Consejo Superior de Investigaciones Científicas (CSIC) and Univ. de Sevilla, Seville (Spain). Inst. de Bioquímica Vegetal y Fotosíntesis; Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC and Universidad de Sevilla, Seville, Spaina
Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Lab.
Consejo Superior de Investigaciones Científicas (CSIC) and Univ. de Sevilla, Seville (Spain). Inst. de Bioquímica Vegetal y Fotosíntesis
Imperial College, London (United Kingdom). Dept. of Life Sciences
Queen Mary Univ. of London, London (United Kingdom). School of Biological and Chemical Sciences

When deprived of combined nitrogen, some filamentous cyanobacteria contain two cell types: vegetative cells that fix CO₂ through oxygenic photosynthesis and heterocysts that are specialized in N₂ fixation. In the diazotrophic filament, the vegetative cells provide the heterocysts with reduced carbon (mainly in the form of sucrose) and heterocysts provide the vegetative cells with combined nitrogen. Septal junctions traverse peptidoglycan through structures known as nanopores and appear to mediate intercellular molecular transfer that can be traced with fluorescent markers, including the sucrose analog esculin (a coumarin glucoside) that is incorporated into the cells. Uptake of esculin by the model heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 was inhibited by the α-glucosides sucrose and maltose. Analysis of Anabaena mutants identified components of three glucoside transporters that move esculin into the cells: GlsC (Alr4781) and GlsP (All0261) are an ATP-binding subunit and a permease subunit of two different ABC transporters, respectively, and HepP (All1711) is a major facilitator superfamily (MFS) protein that was shown previously to be involved in formation of the heterocyst envelope. Transfer of fluorescent markers (especially calcein) between vegetative cells of Anabaena was impaired by mutation of glucoside transporter genes. GlsP and HepP interact in bacterial two-hybrid assays with the septal junction-related protein SepJ, and GlsC was found to be necessary for the formation of a normal number of septal peptidoglycan nanopores and for normal subcellular localization of SepJ. Therefore, beyond their possible role in nutrient uptake in Anabaena, glucoside transporters influence the structure and function of septal junctions. Heterocyst-forming cyanobacteria have the ability to perform oxygenic photosynthesis and to assimilate atmospheric CO₂ and N₂. These organisms grow as filaments that fix these gases specifically in vegetative cells and heterocysts, respectively. For the filaments to grow, these types of cells exchange nutrients, including sucrose, which serves as a source of reducing power and of carbon skeletons for the heterocysts. Movement of sucrose between cells in the filament takes place through septal junctions and has been traced with a fluorescent sucrose analog, esculin, that can be taken up by the cells. Here, we identified α-glucoside transporters of Anabaena

View Accepted Manuscript (DOE)

Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Plan Nacional de Investigación, Spain; European Regional Development

Grant/Contract Number:: FG02-91ER20021

OSTI ID:: 1474071

Journal Information:: Journal of Bacteriology, Journal Name: Journal of Bacteriology Journal Issue: 7 Vol. 199; ISSN 0021-9193

Publisher:: American Society for MicrobiologyCopyright Statement

Country of Publication:: United States

Language:: English

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