Expression of foreign type I ribulose-1,5-bisphosphate carboxylase/ oxygenase (EC 4.1.1.39) stimulates photosynthesis in cyanobacterium Synechococcus PCC7942 cells

A reporter gene assay revealed that promoters derived from Synechococcus PCC7942 (S.7942) psbAI and Synechocystis PCC6803 (S.6803) psbAII were suitable for the expression of foreign ribulose-bisphosphate carboxylase (RuBisCO; EC 4.1.1.39) in S.7942 cells. Transformational vectors with a promoter and...

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Published in:	Photosynthesis research Vol. 88; no. 3; pp. 287 - 297
Main Authors:	Iwaki, T, Haranoh, K, Inoue, N, Kojima, K, Satoh, R, Nishino, T, Wada, S, Ihara, H, Tsuyama, S, Kobayashi, H, Wadano, A
Format:	Journal Article
Language:	English
Published:	Netherlands Dordrecht : Kluwer Academic Publishers 01-06-2006 Springer Nature B.V
Subjects:	Allochromatium vinosum Cyanobacteria Cyanophyta Gene Expression Oxygen - metabolism Photosynthesis Photosynthesis - physiology Ribulose-Bisphosphate Carboxylase - genetics Ribulose-Bisphosphate Carboxylase - metabolism Synechococcus Synechococcus - genetics Synechococcus - metabolism Synechocystis Transformation, Bacterial
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Summary:	A reporter gene assay revealed that promoters derived from Synechococcus PCC7942 (S.7942) psbAI and Synechocystis PCC6803 (S.6803) psbAII were suitable for the expression of foreign ribulose-bisphosphate carboxylase (RuBisCO; EC 4.1.1.39) in S.7942 cells. Transformational vectors with a promoter and a foreign RuBisCO gene, cvrbc originated from Allochromatium vinosum, were constructed on a binary vector, pUC303, and introduced to S.7942 cells. When the cvrbc was expressed with the S.7942 psbAI promoter, the total RuBisCO activity increased 2.5- to 4-fold than that of the wild type cell. The S.6803 psbAII promoter increased the activity of the transformant 1.5-2 times of that of wild type cell. There was a significant increase in the rate of photosynthesis depending on the increase of RuBisCO activity. The maximum rate of photosynthesis of the transformant cell was 1.63 times higher than that of the wild type under the illumination of 400 μmol m-² s-¹, at 20 mM bicarbonate and at 30 °C. Although the photosynthesis of the higher plant is limited by the ability of photosystems under high irradiance and the high CO₂ concentration, that of the S.7942 cell is limited by the RuBisCO activity, even at high CO₂ concentrations and under high irradiance.
Bibliography:	http://dx.doi.org/10.1007/s11120-006-9048-x ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0166-8595 1573-5079
DOI:	10.1007/s11120-006-9048-x