Cloning, Characterization and Tissue Expression of Disk Abalone (Haliotis Discus Discus) Catalase

Fish Shellfish Immunol. 2008 Mar;24(3):267-78. doi: 10.1016/j.fsi.2007.11.007. Epub 2007 Nov 22.

Abstract

Catalase is an antioxidant enzyme that plays a significant role in protection against oxidative stress by detoxification of hydrogen peroxide (H2O2). A gene coding for a putative catalase was isolated from the disk abalone (Haliotis discus discus) cDNA library and denoted as Ab-catalase. The full-length (2864 bp) Ab-catalase cDNA contained 1,503 bp open reading frame (ORF), encoding 501 amino acid residues with 56 kDa predicted molecular weight. The deduced amino acid sequence of Ab-catalase has characteristic features of catalase family such as catalytic site motif (61FNRERIPERVVHAKGAG77), heme-ligand signature motif (351RLYSYSDT358), NADPH and heme binding residues. Phylogenetic and pairwise identity results indicated that Ab-catalase is more similar to scallop (Chlamys farreri) catalase with 80% amino acid identity except for other reported disk abalone catalase sequences. Constitutive Ab-catalase expression was detected in gill, mantle, gonad, hemocytes, abductor muscle and digestive tract in tissue specific manner. Ab-catalase mRNA was up-regulated in gill and digestive tract tissues for the first 3h post injection of H2O2, showing the inducible ability of abalone catalase against oxidative stress generated by H2O2. The purified recombinant catalase showed 30,000 U/mg enzymatic activity against H2O2 and biochemical properties of higher thermal stability and broad spectrum of pH. Our results suggest that abalone catalase may play an important role in regulating oxidative stress by scavenging H2O2.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Catalase / chemistry
  • Catalase / genetics*
  • Catalase / metabolism*
  • Cloning, Molecular
  • Gastropoda / enzymology*
  • Gastropoda / genetics*
  • Gene Expression Regulation, Enzymologic* / drug effects
  • Humans
  • Hydrogen Peroxide / pharmacology
  • Hydrogen-Ion Concentration
  • Molecular Sequence Data
  • Oxidants / pharmacology
  • Phylogeny
  • Protein Structure, Tertiary
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism
  • Sequence Alignment
  • Temperature

Substances

  • Oxidants
  • Recombinant Proteins
  • Hydrogen Peroxide
  • Catalase

Associated data

  • GENBANK/DQ821496