Expression of Recombinant Alcohol Dehydrogenase in Escherichia coli Strain BL21 (DE3) and In Planta Agrobacterium Transformation of Tomato Seeds

Main Article Content

Mastura Sani*
Hairul Azman Roslan

Abstract

Alcohol dehydrogenase is an enzyme that is involved in various roles in plant such as plant development, growth and plant responses to abiotic and biotic stresses. A recombinant alcohol dehydrogenase 1 (Adh1) cDNA (r-msAdh1) from Metroxylon sagu has been previously isolated, and it contained 20 nucleotides derived from Elaeis guineensis at the 5’-end and had a molecular weight of 1.14 kb. The objective of this study is to determine the function of r-msAdh1 via analyses in prokaryotic and eukaryotic hosts. For expression in prokaryotic system, pET-41a(+) with a 8x His tag at the C terminal was used for r-msAdh1 protein purification, and expression was achieved using IPTG for 4-6 h in Escherichia coli strain BL21 (DE3) incubated at low temperature. The induced BL21 strain produced a small amount of soluble r-msAdh1 protein while a large amount was present as insoluble aggregates. Subsequently, the r-msAdh1 cDNA was transformed into tomato seeds (Solanum lycopersicum cv. MT1) via Agrobacterium-mediated in planta transformation. The integration of r-msAdh1 cDNA and the selectable marker were detected in transformed seedlings, T0, using polymerase chain reaction technique. The transformation efficiency was determined to be 33% for r-msAdh1 cDNA and 46% for the selectable marker. For stability analysis of the transgene, eleven T1 generation randomly selected seedlings from the transgenic T0 were analyzed for the presence of the cDNA, and all seedlings were found to contain the full length of r-msAdh1 cDNA. However, out of the eleven T1 transgenic lines produced, only four seedlings were used for expression analysis using the reverse transcriptase PCR (RT-PCR). Two transgenic lines, T19 and T111, were determined to contain r-msAdh1 cDNA and this was verified by nucleotide sequencing. Although only a small number of T1 transgenic seedlings was obtained, this study shows that tomato seeds could be used as a target tissue for Agrobacterium-mediated in planta transformation primarily because the protocol is easy, rapid and cheaper compared to tissue culture-based methods.


 


Keywords: Alcohol dehydrogenaseMetroxylon sagu; BL21 (DE3); Agrobacterium tumefaciens; tomato seeds


*Corresponding author: Tel.: +60 84 36 75 50, Fax: +60 84 36 73 01


                                       Email: [email protected]

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References

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