Induction of temperate cyanophage AS-1 by heavy metal - Copper

Lee Lee, Doris Lui, Patricia J. Platner, Shi Fang Hsu, Tin Chun Chu, John Gaynor, Quinn Vega, Bonnie K. Lustigman

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Abstract

Background: It has been reported that some marine cyanophage are temperate and can be induced from a lysogenic phase to a lytic phase by different agents such as heavy metals. However, to date no significant reports have focused on the temperate nature of freshwater cyanophage/cyanobacteria. Previous experiments with cyanophage AS-1 and cyanobacteria Anacystis nidulans have provided some evidence that AS-1 may have a lysogenic life cycle in addition to the characterized lytic cycle. Results: In this study, the possible temperate A. nidulans was treated with different concentrations of heavy metal-copper. CuSO4 with concentrations of 3.1 × 10-3 M, 3.1 × 10-4 M, 3.1 × 10-5 M and 3.1 × 10 -6 M were used to detect the induction of AS-1 from A. nidulans. The population of the host, unicellular cyanobacteria Anacystis nidulans, was monitored by direct count and turbidity while the amount of virus produced was derived from plaque forming units (PFU) by a direct plating method. The ratio of AS-1 release from A. nidulans was also determined. From these results it appears that AS-1 lysogenic phage can be induced by copper at concentrations from 3.1 × 10-6 M to 3.1 × 10-4 M. Maximal phage induction occurred at 6 hours after addition of copper, with an optimal concentration of 3.1 × 10-6 M. Conclusion: Cu2+ is a significant inducer for lysogenic cyanobacterial cells and consequently would be a potential control agent in the cyanobacteria population in fresh water ecosystems.

Original languageEnglish
Article number17
JournalBMC Microbiology
Volume6
DOIs
StatePublished - 24 Feb 2006

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Cyanobacteria
Heavy Metals
Copper
Fresh Water
Bacteriophages
Life Cycle Stages
Population
Ecosystem
Viruses

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Lee, L., Lui, D., Platner, P. J., Hsu, S. F., Chu, T. C., Gaynor, J., ... Lustigman, B. K. (2006). Induction of temperate cyanophage AS-1 by heavy metal - Copper. BMC Microbiology, 6, [17]. https://doi.org/10.1186/1471-2180-6-17
Lee, Lee ; Lui, Doris ; Platner, Patricia J. ; Hsu, Shi Fang ; Chu, Tin Chun ; Gaynor, John ; Vega, Quinn ; Lustigman, Bonnie K. / Induction of temperate cyanophage AS-1 by heavy metal - Copper. In: BMC Microbiology. 2006 ; Vol. 6.
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Induction of temperate cyanophage AS-1 by heavy metal - Copper. / Lee, Lee; Lui, Doris; Platner, Patricia J.; Hsu, Shi Fang; Chu, Tin Chun; Gaynor, John; Vega, Quinn; Lustigman, Bonnie K.

In: BMC Microbiology, Vol. 6, 17, 24.02.2006.

Research output: Contribution to journalArticle

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AU - Lee, Lee

AU - Lui, Doris

AU - Platner, Patricia J.

AU - Hsu, Shi Fang

AU - Chu, Tin Chun

AU - Gaynor, John

AU - Vega, Quinn

AU - Lustigman, Bonnie K.

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N2 - Background: It has been reported that some marine cyanophage are temperate and can be induced from a lysogenic phase to a lytic phase by different agents such as heavy metals. However, to date no significant reports have focused on the temperate nature of freshwater cyanophage/cyanobacteria. Previous experiments with cyanophage AS-1 and cyanobacteria Anacystis nidulans have provided some evidence that AS-1 may have a lysogenic life cycle in addition to the characterized lytic cycle. Results: In this study, the possible temperate A. nidulans was treated with different concentrations of heavy metal-copper. CuSO4 with concentrations of 3.1 × 10-3 M, 3.1 × 10-4 M, 3.1 × 10-5 M and 3.1 × 10 -6 M were used to detect the induction of AS-1 from A. nidulans. The population of the host, unicellular cyanobacteria Anacystis nidulans, was monitored by direct count and turbidity while the amount of virus produced was derived from plaque forming units (PFU) by a direct plating method. The ratio of AS-1 release from A. nidulans was also determined. From these results it appears that AS-1 lysogenic phage can be induced by copper at concentrations from 3.1 × 10-6 M to 3.1 × 10-4 M. Maximal phage induction occurred at 6 hours after addition of copper, with an optimal concentration of 3.1 × 10-6 M. Conclusion: Cu2+ is a significant inducer for lysogenic cyanobacterial cells and consequently would be a potential control agent in the cyanobacteria population in fresh water ecosystems.

AB - Background: It has been reported that some marine cyanophage are temperate and can be induced from a lysogenic phase to a lytic phase by different agents such as heavy metals. However, to date no significant reports have focused on the temperate nature of freshwater cyanophage/cyanobacteria. Previous experiments with cyanophage AS-1 and cyanobacteria Anacystis nidulans have provided some evidence that AS-1 may have a lysogenic life cycle in addition to the characterized lytic cycle. Results: In this study, the possible temperate A. nidulans was treated with different concentrations of heavy metal-copper. CuSO4 with concentrations of 3.1 × 10-3 M, 3.1 × 10-4 M, 3.1 × 10-5 M and 3.1 × 10 -6 M were used to detect the induction of AS-1 from A. nidulans. The population of the host, unicellular cyanobacteria Anacystis nidulans, was monitored by direct count and turbidity while the amount of virus produced was derived from plaque forming units (PFU) by a direct plating method. The ratio of AS-1 release from A. nidulans was also determined. From these results it appears that AS-1 lysogenic phage can be induced by copper at concentrations from 3.1 × 10-6 M to 3.1 × 10-4 M. Maximal phage induction occurred at 6 hours after addition of copper, with an optimal concentration of 3.1 × 10-6 M. Conclusion: Cu2+ is a significant inducer for lysogenic cyanobacterial cells and consequently would be a potential control agent in the cyanobacteria population in fresh water ecosystems.

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