Structural and biochemical analysis of 1-Cys peroxiredoxin ScPrx1 from Saccharomyces cerevisiae mitochondria

• Published in: Biochimica et biophysica acta. General subjects Vol. 1864; no. 12; p. 129706
• Main Authors: Li, Chang-Cheng, Yang, Mei-jia, Yang, Jing, Kang, Mei, Li, Tao, He, Li-Hui, Song, Ying-Jie, Zhu, Yi-Bo, Zhao, Ning-Lin, Zhao, Chang, Huang, Qin, Mou, Xing-Yu, Li, Hong, Tong, Ai-Ping, Tang, Hong, Bao, Rui
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.12.2020; Elsevier
• Subjects: 1-Cys Peroxiredoxin; Amino Acid Sequence; Catalytic Domain; Crystal structure; Crystallography, X-Ray; Mitochondria; Mitochondria - chemistry; Mitochondria - metabolism; Models, Molecular; Peroxidases - chemistry; Peroxidases - metabolism; Protein Conformation; Saccharomyces cerevisiae; Saccharomyces cerevisiae - chemistry; Saccharomyces cerevisiae - metabolism; Saccharomyces cerevisiae Proteins - chemistry; Saccharomyces cerevisiae Proteins - metabolism; Substrate Specificity; Thioredoxin; Thioredoxins - metabolism; FF; LU; Thioredoxin; SDS–PAGE; CP; CR; SPOH; 1-Cys Peroxiredoxin; Mitochondria; SSRF; PMSF; LB; Prx; IPTG; OD600; rmsd; Trx; Saccharomyces cerevisiae; GSH; beta-ME; Crystal structure; NFPS
• ISSN: 0304-4165; 1872-8006
• DOI: 10.1016/j.bbagen.2020.129706

ScPrx1 is a yeast mitochondrial 1-Cys peroxiredoxins (Prx), a type of Prx enzyme which require thiol-containing reducing agents to resolve its peroxidatic cysteine. ScPrx1 plays important role in protection against oxidative stress. Mitochondrial thioredoxin ScTrx3 and glutathione have been reported to be the physiological electron donor for ScPrx1. However, the mechanism underlying their actions, especially the substrate recognition of ScPrx1 requires additional elucidation. METHODS: The structure of ScPrx1 was obtained through crystallization experiments. The oligomeric state of ScPrx1 was monitored by Blue-Native PAGE. Mutations were generated by the QuikChange PCR-based method. The ScPrx1 activity assay was carried out by measuring the change of 340 nm absorption of the NADPH oxidation. ScPrx1 exist as a homodimer in solution. The structure adopts a typical Prx-fold core which is preceded by an N-terminal β-hairpin and has a C-terminal extension. Mutations (Glu94Ala, Arg198Ala and Trp126) close to the active site could enhance the catalytic efficiency of ScPrx1 while His83Ala and mutations on α4-β6 region exhibited reduced activity. The biochemical data also show that the deletion or mutations on ScPrx1 C-terminal have 2–4.56 fold increased activity. We inferred that conformational changes of ScPrx1 C-terminal segment were important for its reaction, and the α4-β6 loop regions around the ScPrx1 active sites were important for the catalytic function of ScPrx1. Collectively, these structural features provides a basis for understanding the diverse reductant species usage in different 1-Cys Prxs. •High resolution (1.53 Å) crystal structure of yeast 1-Cys Peroxiredoxin was determined.•C-terminal truncated ScPrx1 exhibited enhanced thioredoxin peroxidase activity.•The conformational deformations of active sites and C-terminal region are essential for the the substrate recognition in ScPrx1.