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• W2929834089 endingPage "659" @default.
• W2929834089 startingPage "647" @default.
• W2929834089 abstract "Organisms possess a cellular antioxidant defense system inclusive of ROS scavengers to maintain the homeostasis of antioxidant levels. Catalase is a major ROS scavenger enzyme that plays a significant role in the antioxidant defense mechanism of organisms by reducing toxic hydrogen peroxide molecules into a nontoxic form of oxygen and water with a high turnover rate. In the present study, we performed molecular and functional characterization of the catalase homolog from Hippocampus abdominalis (HaCat). The HaCat cDNA sequence was identified as a 1578 bp ORF (open reading frame) that encodes a polypeptide of 526 amino acids with 59.33 kDa molecular weight. Its estimated pI value is 7.7, and it does not have any signal sequences. HaCat shared a conserved domain arrangement including the catalase proximal active site signature and heme ligand signature domain with the previously identified catalase counterparts. Phylogenetic analysis displayed close evolutionary relationships between HaCat and catalases from other teleost fish. According to our qPCR results, ubiquitous expression of HaCat transcripts were observed in all the tested tissues with high expression in the kidney followed by liver. Significant modulations of HaCat transcription were observed in blood, liver, and kidney tissues post-challenge with Streptococcus iniae, Edwardsiella tarda, poly I:C, and LPS. Peroxidase activity of recombinant HaCat (rHaCat) was evaluated using an ABTS assay and the ROS removal effect was further confirmed by oxidative DNA damage protection and cell viability assays. The rHaCat showed more than 97% activity over a temperature and pH range of 10 °C–40 °C and 5 to 6, respectively. The above results suggest that HaCat plays an indispensable role in the oxidative homeostasis of the seahorse during pathogenic attack." @default.
• W2929834089 created "2019-04-11" @default.
• W2929834089 creator A5067466942 @default.
• W2929834089 creator A5068964172 @default.
• W2929834089 creator A5079207807 @default.
• W2929834089 date "2019-06-01" @default.
• W2929834089 modified "2023-09-25" @default.
• W2929834089 title "Molecular cloning, characterization, and expression level analysis of a marine teleost homolog of catalase from big belly seahorse (Hippocampus abdominalis)" @default.
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• W2929834089 doi "https://doi.org/10.1016/j.fsi.2019.03.064" @default.
• W2929834089 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30936047" @default.
• W2929834089 hasPublicationYear "2019" @default.
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