title: Specific Glucoside Transporters Influence Septal Structure and Function in the Filamentous, Heterocyst-Forming Cyanobacterium Anabaena sp. Strain PCC 7120.
abstract: When deprived of combined nitrogen, some filamentous cyanobacteria contain two cell types: vegetative cells that fix CO2through oxygenic photosynthesis and heterocysts that are specialized in N2fixation. 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 cyanobacteriumAnabaenasp. strain PCC 7120 was inhibited by the α-glucosides sucrose and maltose. Analysis ofAnabaenamutants 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 ofAnabaenawas 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 inAnabaena, glucoside transporters influence the structure and function of septal junctions.IMPORTANCEHeterocyst-forming cyanobacteria have the ability to perform oxygenic photosynthesis and to assimilate atmospheric CO2and N2These 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 ofAnabaenathat mediate uptake of esculin and, notably, influence septal structure and the function of septal junctions.
authors.affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC and Universidad de Sevilla, Seville, Spain.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Nieves-Morión
authors.affiliation: MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan, USA.
authors.forename: Sigal
authors.initials: S
authors.lastname: Lechno-Yossef
authors.affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC and Universidad de Sevilla, Seville, Spain.
authors.forename: Rocío
authors.initials: R
authors.lastname: López-Igual
authors.affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC and Universidad de Sevilla, Seville, Spain.
authors.forename: José E
authors.initials: JE
authors.lastname: Frías
authors.affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC and Universidad de Sevilla, Seville, Spain.
authors.forename: Vicente
authors.initials: V
authors.lastname: Mariscal
authors.affiliation: Department of Life Sciences, Imperial College London, London, United Kingdom.
authors.forename: Dennis J
authors.initials: DJ
authors.lastname: Nürnberg
authors.affiliation: School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom.
authors.forename: Conrad W
authors.initials: CW
authors.lastname: Mullineaux
authors.affiliation: MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan, USA.
authors.forename: C Peter
authors.initials: CP
authors.lastname: Wolk
authors.affiliation: Instituto de Bioquímica Vegetal y Fotosíntesis, CSIC and Universidad de Sevilla, Seville, Spain eflores@ibvf.csic.es.
authors.forename: Enrique
authors.identifier: http://orcid.org/0000-0001-7605-7343
authors.initials: E
authors.lastname: Flores
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D017033:Anabaena / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism; D001692:Biological Transport; D004929:Esculin / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial / Q000502:physiology*; D005960:Glucosides / Q000378:metabolism*; D009154:Mutation; D011485:Protein Binding
chemical_list: D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D005960:Glucosides; D004929:Esculin
keywords: ABC transporters; cyanobacteria; glucoside transport; heterocyst; intercellular diffusion; major facilitator superfamily; membrane transporters