Abstract
Bacterial biosensors can measure pollution in terms of their actual toxicity to living organisms. A recombinant bacterial biosensor has been constructed that is known to respond to toxic levels of Zn2+, Cd2+ and Hg2+. The zinc regulatory gene zntR and zntA promoter from znt operon of E. coli have been used to trigger the expression of GFP reporter protein at toxic levels of these ions. The sensor was induced with 3–800 ppm of Zn2+, 0.005–4 ppm of Cd2+ and 0.001–0.12 ppm of Hg2+ ions. Induction studies were also performed in liquid media to quantify GFP fluorescence using fluorimeter. To determine the optimum culture conditions three different incubation periods (16, 20 and 24 h) were followed. Results showed an increased and consistent fluorescence in cells incubated for 16 h. Maximum induction for Zn2+, Cd2+ and Hg2+ was observed at 20, 0.005 and 0.002 ppm, respectively. The pPROBE-zntR-zntA biosensor reported here can be employed as a primary screening technique for aquatic heavy metal pollution.
Similar content being viewed by others
References
Mukhopadhyay MK, Konar SK (1985) Effects of copper, zinc and iron mixture on fish and aquatic ecosystem. Environ Ecol 3:58–64
Kumar A, Mathur RP (1991) Bioaccumulation kinetics and organ distribution of lead in a fresh water teleost, Colisa fasciatus. Environ Technol 12:731–735
Mohan D, Choudhary A (1991) Zinc accumulation in a few tissues of fish, Puntius sophore (Ham.) after sublethal exposure. J Nat Conserv 3:205–208
Wepener V, van Vuren JHJ, du Preez HH (2001) Uptake and distribution of copper, iron and zinc mixture in gill, liver and plasma of a freshwater teleost, Tilapia sparrmanii. Water SA 27:99–108
Tecon R, Meer JR (2008) Bacterial biosensors for measuring availability of environmental pollutants. Sensors 8:4062–4080
Rensing C, Mitra B, Rosen BP (1997) The zntA gene of Escherichia coli encodes a Zn(II)-translocating P-type ATPase. Proc Natl Acad Sci USA 94:14326–14331
Beard SJ, Hashim R, Membrillo-Hernandez J, Hughes MN, Poole RK (1997) Zinc(II) tolerance in Escherichia coli K-12: evidence that the zntA gene (o732) encodes a cation transport ATPase. Mol Microbiol 25:883–891
Blencowe DK, Samantha JM, Morby AP (1997) Preliminary characterization of zntA, a gene which encodes a Zn (II)/Cd (II)-export protein in Escherichia coli. Biotechnol et alia 2:1–6
Outten CE, Outten FW, O’Halloran TV (1999) DNA distortion mechanism for transcriptional activation by ZntR, a Zn (II)-responsive MerR homologue in Escherichia coli. J Biol Chem 274:37517–37524
Ivask A, Virta M, Karhu A (2002) Construction and use of specific luminescent recombinant bacterial sensors for the assessment of bioavailable fraction of cadmium, zinc, mercury and chromium in the soil. Soil Biol Biochem 34:1439–1447
Liao VHC, Ou KL (2005) Development and testing of a green fluorescent protein–based bacterial biosensor for measuring bioavailable arsenic in contaminated groundwater samples. Environ Toxicol Chem 24:1624–1631
Siddiki MSR, Kawakami Y, Ueda S, Maeda I (2011) Solid phase biosensors for arsenic or cadmium composed of a trans factor and cis element complex. Sensors 11:10063–10073
Wu CH (2009) Optimization of a whole-cell cadmium sensor with a toggle gene circuit. Biotechnol Prog 25:898–903
Raja CE, Selvam GS (2011) Construction of green fluorescent protein based bacterial biosensor for heavy metal remediation. Int J Environ Sci Technol 8:793–798
Priyadarshi H, Alam A, Gireesh-Babu P, Das R, Kishore P, Kumar S, Chaudhari A (2012) A GFP-based bacterial biosensor with chromosomally integrated sensing cassette for quantitative detection of Hg(II) in environment. J Environ Sci 24:963–968
Chakraborty T, Gireesh-Babu P, Alam A, Chaudhari A (2008) GFP expressing bacterial biosensor to measure lead contamination in aquatic environment. Curr Sci 94:800–805
Hillson NJ, Hu P, Andersen GL, Shapiro L (2007) Caulobacter crescentus as a whole-cell uranium biosensor. Appl Environ Microbiol 73:7615–7621
Sambrook J, Russell DW, Janssen KA, Irwin N (2001) Molecular cloning: a laboratory manual. Cold Spring harbor Laboratory, Cold Spring Harbor
Li YF, Li FY, Ho CL, Liao VHC (2008) Construction and comparison of fluorescence and bioluminescence bacterial biosensors for the detection of bioavailable toluene and related compounds. Environ Pollut 152:123–129
Shaner NC, Steinbach PA, Tsien RY (2005) A guide to choosing fluorescent proteins. Nat Methods 2:905–909
Binet MR, Poole RK (2000) Cd(II), Pb(II) and Zn(II) ions regulate expression of the metal-transporting P-type ATPase ZntA in Escherichia coli. FEBS Lett 473:67–70
Gatti D, Mitra B, Rosen BP (2000) Escherichia coli soft metal ion translocating ATPases. J Biol Chem 275:34009–34012
Acknowledgments
The authors would like to acknowledge Dr. W. S. Lakra, Director, CIFE and Dr. Dilip Kumar, Former Director, CIFE for providing necessary facilities, ICAR for JRF fellowship to the first author, Dr. Kshitish Majumdar and Dr. S. Ayyappan for their valuable help, advice and support.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Gireesh-Babu, P., Chaudhari, A. Development of a broad-spectrum fluorescent heavy metal bacterial biosensor. Mol Biol Rep 39, 11225–11229 (2012). https://doi.org/10.1007/s11033-012-2033-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11033-012-2033-x