Degradation of the cyanobacterial hepatotoxin microcystin by a new bacterium isolated from a hypertrophic lake

Citation
Hd. Park et al., Degradation of the cyanobacterial hepatotoxin microcystin by a new bacterium isolated from a hypertrophic lake, ENVIRON TOX, 16(4), 2001, pp. 337-343
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ENVIRONMENTAL TOXICOLOGY
ISSN journal
1520-4081 → ACNP
Volume
16
Issue
4
Year of publication
2001
Pages
337 - 343
Database
ISI
SICI code
1520-4081(200108)16:4<337:DOTCHM>2.0.ZU;2-C
Abstract
A bacterium capable of degrading microcystins-RR, -YR, and -LR was isolated from a hypertrophic lake. The bacterium, designated Y2 and classified phen otypically as a member of the genus Sphingomonas, was shown to be distinct phylogenetically from any established species of Sphingomonas on the basis of 16S rDNA sequencing. The bacterium was tentatively identified as Sphingo monas by manual chemotaxonomy, but 16S rRNA sequencing analysis suggests th at it is in fact a new species or even a new genus. When the Y2 bacterium w as added to microcystins present in culture medium, the microcystins were d egraded thoroughly in 4 days. The highest degradation rates of microcystins -RR and -LR were 13 and 5.4 mg L-1 day(-1), respectively. The degradation r ates were strongly dependent on temperature and the maximum rate was at 30 degreesC. (C) 2001 by John Wiley & Sons, Inc.