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Artificial RNA aptamer production by the marine bacterium Rhodovulum sulfidophilum: Improvement of the aptamer yield using a mutated transcriptional promoter
Noncoding small RNAs and artificial RNA aptamers are now expected to be potential candidates for RNA therapeutic agents. We previously proposed a unique method for economical production of these RNAs using the marine phototrophic bacterium Rhodovulum sulfidophilum. This bacterium does not produce an...
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Published in: | Journal of bioscience and bioengineering 2011-11, Vol.112 (5), p.458-461 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Noncoding small RNAs and artificial RNA aptamers are now expected to be potential candidates for RNA therapeutic agents. We previously proposed a unique method for economical production of these RNAs using the marine phototrophic bacterium
Rhodovulum sulfidophilum. This bacterium does not produce any ribonucleases but does produce extracellular nucleic acids in the culture medium in nature. Using this bacterium and an engineered plasmid containing the
rrn promoter for the RNA expression, we developed a method for production of the streptavidin RNA aptamer in the culture medium. However, the yield of this RNA product in the culture medium by this method was not enough for practical use. In the present paper, we improved the yield of this product by modification of the −
35 region of the
rrn promoter so as to escape from the Fis protein control and the use of a new vector plasmid. Using this system, the extracellular RNA aptamer of approximately 200
ng and the total RNA aptamer (both extra- and intracellular form) of about 20
μg from 1
L culture were accomplished by constitutive expression of the gene. |
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ISSN: | 1389-1723 1347-4421 |
DOI: | 10.1016/j.jbiosc.2011.07.025 |