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Applied and Environmental Microbiology, June 2008, p. 3410-3418, Vol. 74, No. 11
0099-2240/08/$08.00+0     doi:10.1128/AEM.00366-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Synthesis and Accumulation of Cyanophycin in Transgenic Strains of Saccharomyces cerevisiae{triangledown}

Anna Steinle,1 Fred Bernd Oppermann-Sanio,1 Rudolf Reichelt,2 and Alexander Steinbüchel1*

Institut für Molekulare Mikrobiologie und Biotechnologie,1 Institut für Medizinische Physik und Biophysik, Westfälische Wilhelms-Universität, Münster, Germany2

Received 13 February 2008/ Accepted 4 April 2008

Cyanophycin [multi-L-arginyl-poly(L-aspartic acid) (CGP)] was, for the first time, produced in yeast. As yeasts are very important production organisms in biotechnology, it was determined if CGP can be produced in two different strains of Saccharomyces cerevisiae. The episomal vector systems pESC (with the galactose-inducible promoter GAL1) and pYEX-BX (with the copper ion-inducible promoter CUP1) were chosen to express the cyanophycin synthetase gene from the cyanobacterium Synechocystis sp. strain PCC 6308 (cphA6308) in yeast. Expression experiments with transgenic yeasts revealed that the use of the CUP1 promoter is much more efficient for CGP production than the GAL1 promoter. As observed by electrophoresis of isolated CGP in sodium dodecyl sulfate-polyacrylamide gels, the yeast strains produced two different types of polymer: the water-soluble and the water-insoluble CGP were observed as major and minor forms of the polymer, respectively. A maximum CGP content of 6.9% (wt/wt) was detected in the cells. High-performance liquid chromatography analysis showed that the isolated polymers consisted mainly of the two amino acids aspartic acid and arginine and that, in addition, a minor amount (2 mol%) of lysine was present. Growth of transgenic yeasts in the presence of 15 mM lysine resulted in an incorporation of up to 10 mol% of lysine into CGP. Anti-CGP antibodies generated against CGP isolated from Escherichia coli TOP10 harboring cphA6308 reacted with insoluble CGP but not with soluble CGP, if applied in Western or dot blots.

* Corresponding author. Mailing address: Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Corrensstraβe 3, D-48149 Münster, Germany. Phone: 49 251 8339821. Fax: 49 251 8338388. E-mail: steinbu{at}uni-muenster.de

{triangledown} Published ahead of print on 11 April 2008.

Applied and Environmental Microbiology, June 2008, p. 3410-3418, Vol. 74, No. 11
0099-2240/08/$08.00+0     doi:10.1128/AEM.00366-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Steinle, A., Bergander, K., Steinbuchel, A. (2009). Metabolic Engineering of Saccharomyces cerevisiae for Production of Novel Cyanophycins with an Extended Range of Constituent Amino Acids. Appl. Environ. Microbiol. 75: 3437-3446 [Abstract] [Full Text]  


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