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Transcription of T7 DNA immobilised on latex beads and Langmuir-Blodgett film

Ghosh, Debalina and Ramakanth, Madhugiri and Bhaumik, Anusarka and Faure, Nicolas and Rondelez, Francis and Chatterji, Dipankar (2005) Transcription of T7 DNA immobilised on latex beads and Langmuir-Blodgett film. In: Journal of Biochemical and Biophysical Methods, 62 (1). pp. 51-62.

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The recognition of DNA is the first and most important condition for biological applications, including transcription and translation regulators and DNA sensors. For this purpose, we have developed few systems where we were able to immobilize long double-stranded DNA (dsDNA) successfully to the surfaces of different solid substrates. To achieve this, we have chosen polystyrene beads and standard Langmuir-Blodgett monolayer of Zn-arachidate. In the first attempt, variant of T7 DNA containing one strong promoter A1 for Escherichia coli RNA polymerase was immobilised on uniform polystyrene microspheres (0.31 microm diameter) by covalent grafting. In the latter case, Zn(II) is bound to arachidic acid through charge neutralization. Since tetrahedral Zn(II) participates in DNA recognition through coordination, we have been able to layer DNA over the Zn-arachidate monolayer. The successful immobilization of DNAs on these different substrates was visualized under fluorescence microscope. These immobilized DNAs were used as a template to study in vitro transcription reaction and thus we introduce a new strategy for the study of transcription in heterogeneous phase.

Item Type: Journal Article
Publication: Journal of Biochemical and Biophysical Methods
Publisher: Elsevier
Additional Information: The Copyright belongs to Elsevier.
Keywords: T7 DNA;A1 promoter;Immobilised;Latex beads;LB films;RNA polymerase;Transcription
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 01 Mar 2006
Last Modified: 19 Sep 2010 04:24
URI: http://eprints.iisc.ac.in/id/eprint/5688

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