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

Journal Article · · Journal of Bacteriology
DOI:https://doi.org/10.1128/JB.00876-16· OSTI ID:1474071
 [1];  [2];  [1];  [1];  [1];  [3];  [4];  [2]; ORCiD logo [1]
  1. Consejo Superior de Investigaciones Científicas (CSIC) and Univ. de Sevilla, Seville (Spain). Inst. de Bioquímica Vegetal y Fotosíntesis
  2. Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Lab.
  3. Imperial College, London (United Kingdom). Dept. of Life Sciences
  4. 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

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Plan Nacional de Investigación, Spain; European Regional Development
Grant/Contract Number:
FG02-91ER20021; BFU2014-56757-P
OSTI ID:
1474071
Journal Information:
Journal of Bacteriology, Vol. 199, Issue 7; ISSN 0021-9193
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (9)

Cyanobacterial carboxysomes contain an unique rubisco‐activase‐like protein journal October 2019
The small Ca2+-binding protein CSE links Ca2+ signalling with nitrogen metabolism and filament integrity in Anabaena sp. PCC 7120 journal March 2020
ATP-binding cassette transporters of the multicellular cyanobacterium Anabaena sp. PCC 7120: a wide variety for a complex lifestyle journal January 2018
Pentapeptide‐repeat, cytoplasmic‐membrane protein HglK influences the septal junctions in the heterocystous cyanobacterium Anabaena journal January 2020
Cyanobacterial Septal Junctions: Properties and Regulation journal December 2018
LytM factor Alr3353 affects filament morphology and cell-cell communication in the multicellular cyanobacterium Anabaena sp. PCC 7120: Function of amidase activators in multicellular cyanobacteria journal March 2018
Role of Two Cell Wall Amidases in Septal Junction and Nanopore Formation in the Multicellular Cyanobacterium Anabaena sp. PCC 7120 journal September 2017
The small Ca 2+ -binding protein CSE links Ca 2+ signalling with nitrogen metabolism and filament integrity in Anabaena sp. PCC 7120 text January 2020
The small Ca 2+ -binding protein CSE links Ca 2+ signalling with nitrogen metabolism and filament integrity in Anabaena sp. PCC 7120 text January 2020