Molecular cloning, characterization and mRNA expression of selenium-binding protein in abalone (Haliotis discus hannai Ino): Response to dietary selenium, iron and zinc

Cheng Long Wu, Wen Bing Zhang, Kang Sen Mai, Xu Fang Liang, Wei Xu, Jia Wang, Hong Ming Ma

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Selenium-binding protein (SEBP) is believed to play crucial role in controlling the oxidation/reduction in the physiological processes. In this study, the cDNA of selenium-binding protein from abalone Haliotis discus hannai Ino (HdhSEBP) was cloned by homology cloning and rapid amplification of cDNA ends (RACE) technique. The full length of HdhSEBP cDNA was 2071bp, consisting of a 5' untranslated region (UTR) of 55bp, a 3' UTR of 522bp, and an open reading frame (ORF) of 1494bp. The deduced protein has 497 amino acid residues with a calculated molecular mass of 55.6kDa and a predicted isoelectric point of 5.47. BLAST analysis reveals that HdhSEBP shares high identities with other known SEBPs from mammal, bird, fish and mollusk, etc. The mRNA expression patterns of HdhSEBP in hepatopancreas and haemocytes were measured by real-time PCR in abalone fed with nine different diets containing graded levels of selenium (0, 1 and 50mgKg-1), iron (0, 65 and 1300mgKg-1) and zinc (0, 35 and 700mgKg-1) for 20 weeks, respectively. The results showed that the expression of the HdhSEBP mRNA increased and reached the maximum at optimal dietary selenium (1mgKg-1), iron (65mgKg-1) and zinc (35 mg Kg-1), respectively. Deficient or excessive level of dietary selenium, iron or zinc, respectively, leaded to significant depression of HdhSEBP mRNA. It is concluded that the expression levels of HdhSEBP are affected by dietary selenium, iron or zinc.

Original languageEnglish
Pages (from-to)117-125
Number of pages9
JournalFish and Shellfish Immunology
Volume29
Issue number1
DOIs
StatePublished - Jul 2010
Externally publishedYes

Keywords

  • CDNA cloning
  • Haliotis discus hannai
  • MRNA expression
  • Minerals
  • Selenium-binding protein

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