Plasmid-Encoded Heavy Metal Resistance in Pseudomonas sp.

Ünaldi, M. N.; Korkmaz, Hatice; Arikan, Burhan; Coral, Gökhan

doi:10.1007/s00128-003-8575-9

Cited by 14 publications

(10 citation statements)

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“…E. coli ASU 3 was able to grow at high concentration of heavy metals in liquid media which might be important for the capacity of bacterium to survive in different sources of pollution with elevated heavy metal levels. Our results showed high tolerance of E. coli were in agreement with Unaldi et al (2003). They isolated strains of Pseudomonas on GSP agar medium from soil treated with industrial wastewater with MIC 4, 7, and 6 mM for nickel, cadmium and copper, respectively.…”

Section: Examination Of Heavy Metal Tolerance For E Colisupporting

confidence: 90%

The role of antioxidants enzymes of E. coli ASU3, a tolerant strain to heavy metals toxicity, in combating oxidative stress of copper

Abskharon

Hassan

Kabir

et al. 2009

World J Microbiol Biotechnol

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The current study describes the isolation and characterization of E. coli from wastewater that collected from El-Malah canal in Assiut, Egypt. Twelve isolates were investigated for heavy metal resistance by which one of them showed multiple metal resistances. Furthermore, the bacterium was identified as E. coli ASU3 according to biochemical tests and then, preserved at Assuit University Mycological Centre with accession number AUMC B83. It exhibited high minimal inhibitory concentrations for metals and antibiotic resistance. The order of metals toxicity to the bacterium was Cr 6? [ Cu 2? [ Co 2? [ Pb 2? [ Ni 2? [ Cr 3? [ Cd 2? [ Zn 2? . Total protein content of E. coli ASU3 decreased with the increase of copper concentration.Under exposure of different concentrations of copper, the induction of antioxidant enzymes such as catalase, peroxidase and ascorbate peroxidase was increased and these antioxidant enzymes can contribute to combating oxidative stresses.

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Section: Examination Of Heavy Metal Tolerance For E Colisupporting

confidence: 90%

The role of antioxidants enzymes of E. coli ASU3, a tolerant strain to heavy metals toxicity, in combating oxidative stress of copper

Abskharon

Hassan

Kabir

et al. 2009

World J Microbiol Biotechnol

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“…These results indicated that the plasmid can replicate in E. coli DH5a and that it possesses the genetic information necessary for the expression of resistance of hexa-or trivalent chromium. The results are in agreement with (Piotrowska-Seget et al 2005;Ü naldi et al 2003).…”

Section: Many Investigators Have Reported That Metal Resistancesupporting

confidence: 89%

Heavy Metal Resistant of E. coli Isolated from Wastewater Sites in Assiut City, Egypt

Abskharon

Hassan

El-Rab

et al. 2008

Bull Environ Contam Toxicol

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Twelve isolates of E. coli were isolated from wastewater of El-Malah canal located in Assiut, Egypt and were checked for their heavy metal tolerance. One isolate has tested for its multiple metal resistances and found to be plasmid mediated with molecular weights 27 and 65 kb for hexa- and trivalent chromium. It was identified as E. coli ASU 7. Its minimal inhibitory concentration (MIC) for Cu(2+), Co(2+), Ni(2+), Zn(2+), Cr(6+), Cr(3+), Cd(2+) and Pb(2+) were 1.57, 2.55, 1.7, 9.17, 0.48, 7.69, 4.4 and 3.1 mM, respectively. Growth kinetics was determined under Cr(6+) and Cr(3+) stress. SDS-PAGE of protein profile shows that 10 ppm (0.19 mM) of Cr(6+) induces new protein with molecular weight 23 kDa.

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“…Significantly these plasmids have been isolated most exclusively from species of the genus Pseudomonas, a group of bacteria known to play a major role in the breakdown and recycling of organic molecules both in soil and water (Fisher et al, 1978). Similar result of plasmid encoded ampicillin resistance, obtained from Pseudomonas species was isolated from water and soil samples (Unaldi et al, 2003). Plasmid conferring resistance to heavy metals and antibiotics was recorded in bacteria such as Pseudomonas fluorescence and Alcaligenes eutrophus from aquatic environments (Bopp and Ehrlich, 1988;Schuett, 1988;Hamabuckers, 1993).…”

Section: B) Biodegradation Of Methomyl By Pseudomonas Aeruginosasupporting

confidence: 59%