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Applied and Environmental Microbiology, January 2000, p. 64-72, Vol. 66, No. 1
0099-2240/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Increased Production of Zeaxanthin and Other Pigments by Application of Genetic Engineering Techniques to Synechocystis sp. Strain PCC 6803

Delphine Lagarde,1,2,* Laurent Beuf,1 and Wim Vermaas2

Thallia Pharmaceuticals S.A. L'Orée d'Ecully, 69132 Ecully cedex, France,1 and Department of Plant Biology and Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, Arizona 85287-16012

Received 28 June 1999/Accepted 17 October 1999

The psbAII locus was used as an integration platform to overexpress genes involved in carotenoid biosynthesis in Synechocystis sp. strain PCC 6803 under the control of the strong psbAII promoter. The sequences of the genes encoding the yeast isopentenyl diphosphate isomerase (ipi) and the Synechocystis beta -carotene hydroxylase (crtR) and the linked Synechocystis genes coding for phytoene desaturase and phytoene synthase (crtP and crtB, respectively) were introduced into Synechocystis, replacing the psbAII coding sequence. Expression of ipi, crtR, and crtP and crtB led to a large increase in the corresponding transcript levels in the mutant strains, showing that the psbAII promoter can be used to drive transcription and to overexpress various genes in Synechocystis. Overexpression of crtP and crtB led to a 50% increase in the myxoxanthophyll and zeaxanthin contents in the mutant strain, whereas the beta -carotene and echinenone contents remained unchanged. Overexpression of crtR induced a 2.5-fold increase in zeaxanthin accumulation in the corresponding overexpressing mutant compared to that in the wild-type strain. In this mutant strain, zeaxanthin becomes the major pigment (more than half the total amount of carotenoid) and the beta -carotene and echinenone amounts are reduced by a factor of 2. However, overexpression of ipi did not result in a change in the carotenoid content of the mutant. To further alter the carotenoid content of Synechocystis, the crtO gene, encoding beta -carotene ketolase, which converts beta -carotene to echinenone, was disrupted in the wild type and in the overexpressing strains so that they no longer produced echinenone. In this way, by a combination of overexpression and deletion of particular genes, the carotenoid content of cyanobacteria can be altered significantly.

* Corresponding author. Present address: Protéus, 1105 avenue Pierre Mendes France, F-30000 Nimes, France. Phone: 33 (0) 4 66 70 64 64. Fax: 33 (0) 4 66 70 64 60. E-mail: d_lagarde{at}hotmail.com.

Applied and Environmental Microbiology, January 2000, p. 64-72, Vol. 66, No. 1
0099-2240/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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