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L-valine, an antialgal amino acid from Streptomyces jiujiangensis JXJ 0074T
An antialgal compound was isolated from the cultured broth of Streptomyces jiujiangensis JXJ 0074 T by using bioassay methods. Based on the data of 1 H-NMR, 13 C-NMR, ESI-MS, and thin layer chromatography, the active compound was identified as L-valine, which showed antialgal activity mainly against...
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Published in: | Applied microbiology and biotechnology 2016-05, Vol.100 (10), p.4627-4636 |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | An antialgal compound was isolated from the cultured broth of
Streptomyces jiujiangensis
JXJ 0074
T
by using bioassay methods. Based on the data of
1
H-NMR,
13
C-NMR, ESI-MS, and thin layer chromatography, the active compound was identified as L-valine, which showed antialgal activity mainly against
Microcystis
. L-valine exhibited greater antialgal activities than both L-lysine and copper sulfate (CuSO
4
) did on
Microcystis aeruginosa
lawn. However,
M. aeruginosa
recovered growth earlier with higher growth rate in L-valine treatment than in L-lysine treatment. L-valine dissipated completely within 2 days, much quicker than L-lysine (6 days), which resulted in the lysing of more than 80 %
M. aeruginosa
cells and the release of amount of intracellular microcystin-LR (MC-LR) within 2 days. As a resultant, the extracellular MC-LR content was more than twice of the control from day 1 to 5. Exposure to L-valine significantly promoted the synthesis of MC-LR. L-lysine also promoted the release and synthesis of MC-LR with much lesser efficiency than L-valine. L-valine could damage
Microcystis
severely, causing perforation and collapse of
M. aeruginosa
cells and decrease of the chlorophyll. The superoxide dismutase (SOD) activity in L-valine-treated cells of
M. aeruginosa
initially increased with 32.94 ± 3.37 % higher than the control after 36 h and then decreased quickly. However, the increase rate of superoxide anion radical (O
2
−
) was much higher than that of SOD, which resulted in serious lipid peroxidation and accumulation of malondialdehyde (MDA). To our knowledge, this is the first report showing L-valine active against cyanobacteria. |
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ISSN: | 0175-7598 1432-0614 |
DOI: | 10.1007/s00253-015-7150-8 |