A Class II CPD Photolyase and a 6‐4 Photolyase with Photorepair Activity from the Antarctic Moss Pohlia nutans M211. (8th July 2021)

• Record Type: Journal Article
• Authors: An, Meiling; Qu, Changfeng; Miao, Jinlai; Sha, Zhenxia
• Is Part Of: Photochemistry and photobiology. Volume 97:Number 6(2021)
• Page Start: 1527
• Page End: 1533
• Publication Date: 2021-07-08
• Subjects: Photochemistry -- Periodicals; Light -- Physiological effect -- Periodicals; 541.35
• DOI: 10.1111/php.13478
• Languages: English
• ISSNs: 0031-8655

Abstract

Abstract: Antarctic mosses are the dominant vegetation in the Antarctic continent. Because of stratospheric ozone depletion, they can withstand physiological extreme UV. The formation of CPD and 6‐4PP is one of the most harmful damages of UV to DNA. DNA damage can interfere with replication and transcription, resulting in mutation and death. Two types of photolyase, CPD photolyase and 6‐4 photolyase, are capable of specific binding CPD or 6‐4PP and repairing these lesions. However, there is little research on photolyase in Antarctic moss. Here, we isolated a gene encoding class II CPD photolyase ( PnCPDPhr ) and a gene encoding 6‐4 photolyase ( Pn6‐4Phr ) from Antarctic moss P. nutans M211. When exposed to UVB, CPDs accumulated in gametophytes and the gene expressions of PnCPDPhr and Pn6‐4Phr were both up‐regulated. In addition, the in vitro expression and photoreactivation assays of PnCPDPhr and Pn6‐4Phr were performed. Our results demonstrated that PnCPDPhr and Pn6‐4Phr have an effective activity of DNA repair. This is the first study to determine the CPD accumulation in Antarctic moss as well as the first report isolating CPD photolyase and 6‐4 photolyase from Antarctic moss. These results will enrich the knowledge of photolyase family and benefit the exploitation of functioning gene in Antarctic moss. Abstract : The formation of CPD and 6‐4PP is one of the most harmful damages to DNA caused by UV. When exposed to UVB, CPDs accumulated in Antarctic moss Pohlia nutans M211 and the content of chlorophyll decreased. UV also produces oxygen free radicals, which lead to oxidative stress. The gene expressions of PnCPDPhr and Pn6‐4Phr were both up‐regulated after UVB exposure. The in vitro photoreactivation assays of PnCPDPhr and Pn6‐4Phr showed that PnCPDPhr and Pn6‐4Phr have an effective activity of DNA repair.