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Functional Characterization of sll1556 of Synechocystis sp. PCC6803 as Type II Isopentenyl Diphosphate Isomerase  

Cho, Kab-Yeon (Dept. of Food Nutrition & Cookery, Woosong College)
Publication Information
The Korean Journal of Food And Nutrition / v.23, no.4, 2010 , pp. 526-530 More about this Journal
Abstract
Isopentenyl diphosphate(IPP) isomerization to dimethylallyl diphosphate(DMAPP) is an important step for the efficient production of isoprenoids such as lycopene, ${\beta}$-carotene, astaxanthin, etc. The type II isopentenyl diphosphate isomerase gene from Synechocystis sp. PCC6803(sll1556, Syidi2) was cloned and expressed in Escherichia coli $DH5{\alpha}$. When E. coli $DH5{\alpha}$ harboring lycopene synthesis genes, crtE, crtB, and crtI and mevalonate pathway genes, MvK1, MvK2, and Mvd, was cultured on LB medium containing mevalonate, the strain grew very slowly be due to the toxicity of isopentenyl diphosphate derived from mevalonate. When Syidi2 was introduced to E. coli $DH5{\alpha}$ harboring the lycopene synthesis genes and mevalonate pathway genes, growth on mevalonate medium was fully restored and the colony showed red color indicating lycopene formation. The growth rate of the mutant strain, E. coli $DH5{\alpha}$(idi::${\Delta}km$), was very slow because of IPP accumulation and DMAPP deprivation. Ultimately the idi mutant was complemented by introducing the Syidi2 gene.
Keywords
isopentenyl diphosphate isomerase; Synechocystis sp.; lycopene; isoprenoid;
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