title: First evidence of accumulation in cyanobacteria of guanidinoacetate, a precursor of the toxin cylindrospermopsin.
abstract: Guanidinoacetate (GAA) is one of the most extensively studied toxic guanidine compounds. Changes in GAA can affect the nervous system and induce hyperhomocysteinemia, representing a risk factor for cardiovascular diseases. In cyanobacteria, GAA is thought to be an intermediate in the synthesis of the toxin cylindrospermopsin (CYN), one of the most common known cyanotoxins that affects multiple organs and functions in animals and plants. In spite of the evidence supporting GAA toxicity and its role in CYN synthesis, no data have been reported on the accumulation of GAA in any cyanobacterium. We have analyzed and compared the content of GAA in cultures of diverse cyanobacteria types, both cylindrospermopsin producing (CYN(+)) and not producing (CYN(-)). The results obtained show that GAA accumulates in the majority of the strains tested, although the highest content was found in one of the CYN(+) strain, Aphanizomenon ovalisporum UAM-MAO. In this strain, both GAA and CYN can be located within and out the cells. In conclusion, GAA appears to be a general cyanobacterial metabolite that due to its proven toxic should be considered when studying and managing cyanobacteria toxicity.
authors.affiliation: Departamento de Biología, C/Darwin 2, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Ángel
authors.initials: Á
authors.lastname: Barón-Sola
authors.affiliation: Departamento de Biología, C/Darwin 2, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Soledad
authors.initials: S
authors.lastname: Sanz-Alférez
authors.affiliation: Departamento de Biología, C/Darwin 2, Universidad Autónoma de Madrid, 28049 Madrid, Spain. Electronic address: francisca.delcampo@uam.es.
authors.forename: Francisca F
authors.initials: FF
authors.lastname: Del Campo
mesh_terms: D000470:Alkaloids; D001427:Bacterial Toxins / Q000378:metabolism*; D000458:Cyanobacteria / Q000378:metabolism*; D000087522:Cyanobacteria Toxins; D005998:Glycine / Q000031:analogs & derivatives* / Q000378:metabolism; D014498:Uracil / Q000031:analogs & derivatives* / Q000378:metabolism
chemical_list: D000470:Alkaloids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; C089595:cylindrospermopsin; D014498:Uracil; C004946:glycocyamine; D005998:Glycine
keywords: Aphanizomenon ovalisporum; Cyanobacteria toxicity; Cylindrospermopsin; Guanidino compounds; Guanidinoacetate