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Molecular characterization of thioredoxin-like protein 1 (TXNL1) from big-belly seahorse Hippocampus abdominalis in response to immune stimulation.

Thioredoxin is a highly conserved protein found in both prokaryotes and eukaryotes. Reactive oxygen species (ROS) are produced in response to metabolic processes, radiation, metal oxidation, and pathological infections. High levels of ROS lead to cell death via autophagy. However, thioredoxin acts as an active regulatory enzyme in response to excessive ROS. Here, we performed in-silico analysis, immune challenge experiments, and functional assays of seahorse thioredoxin-like protein 1 (ShTXNL1). Evolutionary identification showed that ShTXNL1 protein belongs to the thioredoxin superfamily comprising 289 amino acids. It possesses an N-terminal active thioredoxin domain and C-terminal proteasome-interacting thioredoxin domain (PITH) of ShTXNL1 which is a component of 26S proteasome and binds to the matrix or cell. Pairwise alignment results showed 99.0% identity and 99.7% similarity with the sequence of Hippocampus species. Conserved thiol-disulfide cysteine residue containing Cys-X-X-Cys motif may be found in the first few amino acids in the second beta sheet starting from the N-terminus. This motif can be discovered in ShTXNL1 as 14 CRPC17 and comprised two N-linked glycosylation sites at 72 NISA75 and 139 NESD142 . According to the quantitative real-time polymerase chain reaction analysis from healthy seahorses, highest ShTXNL1 mRNA expression was observed in muscle, followed by ovary, brain, gill, and blood tissues. Moreover, significant temporal expression of ShTXNL1 was observed in gill and blood tissues after bacterial stimuli. Thus, the ShTXNL1 gene may be identified as an immunologically important gene in seahorse.

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