Molecular cloning, characterization and mRNA expression of selenium-binding protein in abalone (Haliotis discus hannai Ino): Response to dietary selenium, iron and zinc.
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 2071 bp, consisting of a 5' untranslated region (UTR) of 55 bp, a 3' UTR of 522 bp, and an open reading frame (ORF) of 1494 bp. The deduced protein has 497 amino acid residues with a calculated molecular mass of 55.6 kDa 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 50 mg kg(-1)), iron (0, 65 and 1300 mg kg(-1)) and zinc (0, 35 and 700 mg kg(-1)) for 20 weeks, respectively. The results showed that the expression of the HdhSEBP mRNA increased and reached the maximum at optimal dietary selenium (1 mg kg(-1)), iron (65 mg kg(-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.
Wu
Cheng-Long
CL
The Key Laboratory of Mariculture (Education Ministry of China), Ocean University of China, 5 Yushan Road, Qingdao 266003, PR China.
Zhang
Wen-Bing
WB
Mai
Kang-Sen
KS
Liang
Xu-Fang
XF
Xu
Wei
W
Wang
Jia
J
Ma
Hong-Ming
HM
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D049851:Gastropoda / Q000235:genetics / Q000276:immunology*; D006434:Hemocytes / Q000276:immunology; D043143:Hepatopancreas / Q000276:immunology; D007501:Iron / Q000276:immunology; D008969:Molecular Sequence Data; D012313:RNA / Q000737:chemistry / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique; D012643:Selenium / Q000276:immunology; D051137:Selenium-Binding Proteins / Q000235:genetics / Q000276:immunology*; D016415:Sequence Alignment; D015032:Zinc / Q000276:immunology
D051137:Selenium-Binding Proteins; D012313:RNA; D007501:Iron; D012643:Selenium; D015032:Zinc