Heterotrophic capacities of Plectonema boryanum |
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Authors: | Bilha Raboy Etana Padan Moshe Shilo |
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Affiliation: | (1) Department of Microbiological Chemistry, The Hebrew University-Hadassah Medical School, Jerusalem, Israel |
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Abstract: | Acquisition of the dark heterotrophic growth capacity on glucose in Plectonema boryanum involves both adaptation and enrichment of a fast-growing genotype. The adaptation includes induction of functions involved in glucose incorporation and increase in glucose-6-phosphate dehydrogenase activity. Photosynthetic products are implicated in the control of both systems. Efficient energy conversion in the dark, as measured by cyanophage multiplication, correlates in time with the increase in potential for glucose incorporation while heterotrophic growth capacity correlates with the increase in glucose-6-phosphate dehydrogenase activity. The lower efficiency of heterotrophic growth compared to photoautotrophic growth is discussed in light of the conservation of the photosynthetic potency in the heterotrophic cells.Abbreviations DCMU 3-(3,4-dichlorophenyl)-1,1-dimethylurea - DTT dithiothreitol - G6P glucose-6-phosphate - NADP nicotinamide adenine dinucleotide phosphate - NTG N-methyl-N-nitro-N-nitrosoguanidine - RUDP ribulose-1,5-diphosphate - TCA trichloroacetic acidDedicated to Prof. R. Y. Stanier on the occasion of his 60th birthday |
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Keywords: | Plectonema boryanum Heterotrophic growth Photoautotrophic growth Energy conversion Glucose incorporation |
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