Difference between revisions of "Part:BBa K2092002"

Revision as of 15:26, 1 October 2016

PalcA, improved alcR inducible promoter from A. nidulans

The alcA promoter is one of the strongest inducible promoters in Aspergillus nidulans commonly used to overexpress proteins [1]. It has been shown that alcA promoter is also functional in monocotyledonous plant sugar cane [2] and Escherichia coli [3]. Its transciptional activation is dependent on the binding of its positive transcriptional regulator AlcR with various substrates that employ a hydroxyl group, for example ethanol and threonine. The native AlcA promoter consists of 3 AlcR binding sites. The number and position of the AlcR binding sites on the alcA promoter are crucial in determining its transcriptional activation strength. It has also been shown that each AlcR target in the alcA promoter contributes differently to the activation of the downstream protein expression.

This part is an improved BioBrick previously characterised by 2011 iGEM DTU-Denmark. Sequencing results showed that two Prefix/Suffix restriction sites XbaI and SpeI were absent in the original part. Hence the two missing restriction sites were added using PCR.

References:

[1] Panozzo, C., Capuano, V., Fillinger, S. and Felenbok, B. (1997). The zinc binuclear cluster Activator AlcR is able to bind to single sites but requires multiple repeated sites for synergistic activation of the alcA gene in Aspergillus nidulans. Journal of Biological Chemistry, 272(36), 22859–22865.

[2] Kinkema, M., Geijskes, R.J., Shand, K., Coleman, H.D., De Lucca, P.C., Palupe, A., Harrison, M.D., Jepson, I., Dale, J.L. and Sainz, M.B. (2013). An improved chemically inducible gene switch that functions in the monocotyledonous plant sugar cane. Plant Molecular Biology, 84(4-5), 443–454.

[3] Hemmati, H. and Basu, C. (2015). Transcriptional analyses of an ethanol inducible promoter in Escherichia coli and tobacco for production of cellulase and green fluorescent protein. Biotechnology & Biotechnological Equipment, 29(6), 1043–1052.

Sequence and Features