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Bacterial transformation is a significant breakthrough in the field of molecular biology for cloning purposes. A variety of chemical and physical methods are utilized for enhancing bacterial competence. The present study was designed, via the consolidation of chemical and physical methods, to improve competence of cells for high transformation efficiency up to 109 transformants/µg of DNA. | Turkish Journal of Biology http://journals.tubitak.gov.tr/biology/ Research Article Turk J Biol (2014) 38: 568-573 © TÜBİTAK doi:10.3906/biy-1311-60 Optimization of E. coli culture conditions for efficient DNA uptake by electroporation Irfan AHMAD, Tehseen RUBBAB*, Farah DEEBA, Syed Muhammad Saqlan NAQVI Department of Biochemistry, Faculty of Biological Sciences, PMAS Arid Agriculture University, Rawalpindi, Pakistan Received: 23.11.2013 Accepted: 05.05.2014 Published Online: 05.09.2014 Printed: 30.09.2014 Abstract: Bacterial transformation is a significant breakthrough in the field of molecular biology for cloning purposes. A variety of chemical and physical methods are utilized for enhancing bacterial competence. The present study was designed, via the consolidation of chemical and physical methods, to improve competence of cells for high transformation efficiency up to 109 transformants/µg of DNA. LB and SOC media and their supplemented combinations with osmotic agents (sucrose and glycine) were used to prepare electrocompetent cells of E. coli DH5α at temperatures of 25 and 37 °C, which were then subjected to electroporation. The results showed that cells grown in SOC medium showed high growth rates and increased transformation efficiencies as compared to LB, while media supplemented with osmotic agents also showed higher transformation proficiency as compared to the controls. In all combinations tested, the highest transformation efficiencies were observed in the cells grown in SOC-SG at 25 °C, i.e. 3.56 × 109 cfu/µg of DNA. This study provides valuable knowledge for low-budget biotechnology labs to prepare competent cells with efficiency comparable to commercially available competent cells. Key words: Electroporation, optimization, culture conditions 1. Introduction In molecular biology, transformation is the uptake or introduction and expression of foreign DNA by living cells (Roychoudhry et al., 2009). Many bacteria have the ability to uptake .
