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A thioredoxin from antarctic microcrustacean (Euphausia superba): Cloning and functional characterization
Fengmei Li1, Liyan Ma2, Huan Zhang3
1Qingdao University of Science and Technology, Qingdao 266042, China.
Fish & Shellfish Immunology
|February 25, 2017
Summary
A novel thioredoxin gene, EsTrx1, was identified in Antarctic krill (Euphausia superba). This thioredoxin demonstrates significant antioxidant capacity, suggesting a role in protecting the organism from oxidative stress.
Area of Science:
- Biochemistry
- Molecular Biology
- Marine Biology
Background:
- Thioredoxins are crucial conserved proteins protecting against oxidative stress.
- Identifying novel thioredoxins aids in understanding stress response mechanisms in diverse organisms.
Purpose of the Study:
- To identify and characterize a novel thioredoxin gene (EsTrx1) from the Antarctic krill, Euphausia superba.
- To elucidate the antioxidant function and potential role of EsTrx1 in oxidative stress response.
Main Methods:
- Gene identification and sequencing of EsTrx1 from E. superba.
- Bioinformatic analysis including sequence alignment, molecular weight prediction, and phylogenetic analysis.
- Recombinant protein expression in Escherichia coli and enzymatic assays to determine antioxidant activity.
Main Results:
- A 621 bp cDNA sequence for EsTrx1 was identified, encoding a 100-amino acid protein with a conserved CGPC active site.
- EsTrx1 showed high similarity to other animal thioredoxins and phylogenetic analysis placed it within the Trx1 sub-family.
- Recombinant EsTrx1 (rEsTrx1) exhibited significant redox activity and superior antioxidant capacity compared to glutathione (GSH).
Conclusions:
- EsTrx1 is a novel thioredoxin from E. superba with conserved structural and functional characteristics.
- The findings suggest EsTrx1 plays a vital role in the antioxidant defense system of Antarctic krill, contributing to their survival under oxidative stress.
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