Journal of Microbiology and Biotechnology
The Korean Society for Microbiology and Biotechnology publishes the Journal of Microbiology and Biotechnology.

2019 ; Vol.29-9: 1453~1459

AuthorMinjae Kim, Yongsoo Kang, EonSeon Jin
Place of dutyDepartment of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea
TitleGene Expression Analysis of Zeaxanthin Epoxidase from the Marine Microalga Dunaliella tertiolecta in Response to Light/Dark Cycle and Salinity
PublicationInfo J. Microbiol. Biotechnol.2019 ; Vol.29-9
AbstractZeaxanthin is an important pigment in the photo-protection mechanism of microalgae. However, zeaxanthin epoxidase, an enzyme involved in the accumulation and conversion of zeaxanthin, has not been extensively studied in microalgae. In this work, we report the expression pattern of zeaxanthin epoxidase in Dunaliella tertiolecta (DtZEP) at different light and diverse salinity conditions. To confirm the responsiveness to light conditions, the ZEP expression pattern was investigated in photoperiodic (16 h of light and 8 h of dark) and continuous (24 h of light and 0 h of dark) light conditions. mRNA expression levels in photoperiodic conditions fluctuated along with the light/dark cycle, whereas those in continuous light remained unchanged. In varying salinity conditions, the highest mRNA and protein levels were detected in cells cultured in 1.5 M NaCl, and ZEP expression levels in cells shifted from 0.6 M NaCl to 1.5 M NaCl increased gradually. These results show that mRNA expression of DtZEP responds rapidly to the light/dark cycle or increased salinity, whereas changes in protein synthesis do not occur within a short period. Taken together, we show that DtZEP gene expression responds rapidly to light irradiation and hyperosmotic stress. In addition, ZEP expression patterns in light or salinity conditions are similar to those of higher plants, even though the habitat of D. tertiolecta is different.
Full-Text
Key_wordZeaxanthin epoxidase, Dunaliella tertiolecta, carotenoid biosynthetic pathway, photoperiodic condition, continuous light condition, salinity condition
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