Overexpression of the sulfate transporter‐encoding SULTR2 increases chromium accumulation in Chlamydomonas reinhardtii

Author:

Tang Yuxin1,Zhang Baolong2ORCID,Li Zhaoyang23,Deng Ping4,Deng Xuan2,Long Huan2,Wang Xun1,Huang Kaiyao2

Affiliation:

1. School of Urban Construction Wuhan University of Science and Technology Wuhan Hubei China

2. Key Laboratory of Algal Biology, Institute of Hydrobiology Chinese Academy of Sciences Wuhan Hubei China

3. University of Chinese Academy of Sciences Beijing China

4. Wuhan Academy of Agricultural Sciences Wuhan Hubei China

Abstract

AbstractHexavalent chromium [Cr(Ⅵ)] is a highly toxic contaminant in aquatic systems, and microalgae represent promising bioremediators of metal‐containing wastewater. However, the metal‐binding capacity of algal cells is limited. Therefore, we improved the cellular Cr(Ⅵ) biosorption capacity of Chlamydomonas reinhardtii by overexpressing the sulfate transporter gene SULTR2. SULTR2 was predominantly located in the cytoplasm of the cell, and few proteins mobilized to the cell membrane as a Cr transporter under Cr stress conditions. Intracellular Cr accumulation was almost doubled in SULTR2‐overexpressing transgenic strains after exposure to 30 μM K2Cr2O7 for 4 d. Alginate‐based immobilization increased the rate of Cr removal from 43.81% to 88.15% for SULTR2‐overexpressing transgenic strains after exposure to 10 μM K2Cr2O7 for 6 d. The immobilized cells also displayed a significant increase in nutrient removal efficiency compared to that of free‐swimming cells. Therefore, SULTR2 overexpression in algae has a great potential for the bioremediation of Cr(Ⅵ)‐containing wastewater.

Funder

China Postdoctoral Science Foundation

Publisher

Wiley

Subject

Applied Microbiology and Biotechnology,Bioengineering,Biotechnology

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