Gene Expression Analysis of Zeaxanthin Epoxidase from the Marine Microalga Dunaliella tertiolecta in Response to Light/Dark Cycle and Salinity

Minjae Kim, Yongsoo Kang, Eon Seon Jin

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Zeaxanthin 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.

Original languageEnglish
Pages (from-to)1453-1459
Number of pages7
JournalJournal of microbiology and biotechnology
Volume29
Issue number9
DOIs
StatePublished - 2019

Keywords

  • Carotenoid biosynthetic pathway
  • Continuous light condition
  • Dunaliella tertiolecta
  • Photoperiodic condition
  • Salinity condition
  • Zeaxanthin epoxidase

Fingerprint

Dive into the research topics of 'Gene Expression Analysis of Zeaxanthin Epoxidase from the Marine Microalga Dunaliella tertiolecta in Response to Light/Dark Cycle and Salinity'. Together they form a unique fingerprint.

Cite this