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© Research
Publication : Journal of bacteriology

An extracellular glycoprotein is implicated in cell-cell contacts in the toxic cyanobacterium Microcystis aeruginosa PCC 7806

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of bacteriology - 15 Feb 2008

Zilliges Y, Kehr JC, Mikkat S, Bouchier C, de Marsac NT, Börner T, Dittmann E

Link to Pubmed [PMID] – 18281396

J. Bacteriol. 2008 Apr;190(8):2871-9

Microcystins are the most common cyanobacterial toxins found in freshwater lakes and reservoirs throughout the world. They are frequently produced by the unicellular, colonial cyanobacterium Microcystis aeruginosa; however, the role of the peptide for the producing organism is poorly understood. Differences in the cellular aggregation of M. aeruginosa PCC 7806 and a microcystin-deficient Delta mcyB mutant guided the discovery of a surface-exposed protein that shows increased abundance in PCC 7806 mutants deficient in microcystin production compared to the abundance of this protein in the wild type. Mass spectrometric and immunoblot analyses revealed that the protein, designated microcystin-related protein C (MrpC), is posttranslationally glycosylated, suggesting that it may be a potential target of a putative O-glycosyltransferase of the SPINDLY family encoded downstream of the mrpC gene. Immunofluorescence microscopy detected MrpC at the cell surface, suggesting an involvement of the protein in cellular interactions in strain PCC 7806. Further analyses of field samples of Microcystis demonstrated a strain-specific occurrence of MrpC possibly associated with distinct Microcystis colony types. Our results support the implication of microcystin in the colony specificity of and colony formation by Microcystis.

http://www.ncbi.nlm.nih.gov/pubmed/18281396