Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil
Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capa...
Published in: | Journal of Venomous Animals and Toxins including Tropical Diseases |
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ftdoajarticles:oai:doaj.org/article:e54f54cef18e4c79b07f51af5556a12e 2023-05-15T15:17:50+02:00 Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil Gilmar AF Lemes Luiza W Kist Mauricio R Bogo João S Yunes 2015-03-01T00:00:00Z https://doi.org/10.1186/s40409-015-0001-3 https://doaj.org/article/e54f54cef18e4c79b07f51af5556a12e EN eng SciELO http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100313&lng=en&tlng=en https://doaj.org/toc/1678-9199 1678-9199 doi:10.1186/s40409-015-0001-3 https://doaj.org/article/e54f54cef18e4c79b07f51af5556a12e Journal of Venomous Animals and Toxins including Tropical Diseases, Vol 21, Iss 0 (2015) Biodegradation Microcystin Sediment Patos Lagoon Estuary Brazil Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 article 2015 ftdoajarticles https://doi.org/10.1186/s40409-015-0001-3 2022-12-31T02:24:44Z Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected. Bacteria from the samples were allowed to grow in flasks containing solely [D-Leu1] microcystin-LR. This strain named DMSX was isolated on agar MSM with 8 g L−1 glucose and further purified on a cyanotoxin basis growth. Microcystin concentration was obtained by using the ELISA immunoassay for microcystins whereas bacterial count was performed by epifluorescence microscopy. The genus Pseudomonas was identified by DNA techniques. Results Although several bacterial strains were isolated from the samples, only one, DMXS, was capable of growing on [D-Leu1] microcystin-LR. The phylogenetic analysis of the 16S rRNA gene from DMXS strain classified the organism as Pseudomonas aeruginosa. DMXS strain incubated with [D-Leu1] microcystin-LR lowered the amount of toxin from 1 μg.L−1 to < 0.05 μg.L−1. Besides, an increase in the bacterial count–from 71 × 105 bacteria.mL−1 to 117 × 105 bacteria.mL−1–was observed along the incubation. Conclusions The use of bacteria isolated from sediment for technological applications to remove toxic compounds is viable. Studies have shown that sediment plays an important role as a source of bacteria capable of degrading cyanobacterial toxins. This is the first Brazilian report on a bacterium–of the genus Pseudomonas–that can degrade [D-Leu1] ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Journal of Venomous Animals and Toxins including Tropical Diseases 21 1 4 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Biodegradation Microcystin Sediment Patos Lagoon Estuary Brazil Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 |
spellingShingle |
Biodegradation Microcystin Sediment Patos Lagoon Estuary Brazil Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 Gilmar AF Lemes Luiza W Kist Mauricio R Bogo João S Yunes Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil |
topic_facet |
Biodegradation Microcystin Sediment Patos Lagoon Estuary Brazil Arctic medicine. Tropical medicine RC955-962 Toxicology. Poisons RA1190-1270 Zoology QL1-991 |
description |
Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected. Bacteria from the samples were allowed to grow in flasks containing solely [D-Leu1] microcystin-LR. This strain named DMSX was isolated on agar MSM with 8 g L−1 glucose and further purified on a cyanotoxin basis growth. Microcystin concentration was obtained by using the ELISA immunoassay for microcystins whereas bacterial count was performed by epifluorescence microscopy. The genus Pseudomonas was identified by DNA techniques. Results Although several bacterial strains were isolated from the samples, only one, DMXS, was capable of growing on [D-Leu1] microcystin-LR. The phylogenetic analysis of the 16S rRNA gene from DMXS strain classified the organism as Pseudomonas aeruginosa. DMXS strain incubated with [D-Leu1] microcystin-LR lowered the amount of toxin from 1 μg.L−1 to < 0.05 μg.L−1. Besides, an increase in the bacterial count–from 71 × 105 bacteria.mL−1 to 117 × 105 bacteria.mL−1–was observed along the incubation. Conclusions The use of bacteria isolated from sediment for technological applications to remove toxic compounds is viable. Studies have shown that sediment plays an important role as a source of bacteria capable of degrading cyanobacterial toxins. This is the first Brazilian report on a bacterium–of the genus Pseudomonas–that can degrade [D-Leu1] ... |
format |
Article in Journal/Newspaper |
author |
Gilmar AF Lemes Luiza W Kist Mauricio R Bogo João S Yunes |
author_facet |
Gilmar AF Lemes Luiza W Kist Mauricio R Bogo João S Yunes |
author_sort |
Gilmar AF Lemes |
title |
Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil |
title_short |
Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil |
title_full |
Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil |
title_fullStr |
Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil |
title_full_unstemmed |
Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil |
title_sort |
biodegradation of [d-leu1] microcystin-lr by a bacterium isolated from sediment of patos lagoon estuary, brazil |
publisher |
SciELO |
publishDate |
2015 |
url |
https://doi.org/10.1186/s40409-015-0001-3 https://doaj.org/article/e54f54cef18e4c79b07f51af5556a12e |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Journal of Venomous Animals and Toxins including Tropical Diseases, Vol 21, Iss 0 (2015) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100313&lng=en&tlng=en https://doaj.org/toc/1678-9199 1678-9199 doi:10.1186/s40409-015-0001-3 https://doaj.org/article/e54f54cef18e4c79b07f51af5556a12e |
op_doi |
https://doi.org/10.1186/s40409-015-0001-3 |
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Journal of Venomous Animals and Toxins including Tropical Diseases |
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21 |
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