Biochemical and Immunochemical Characterization of Two Discrete Vitellogenin Proteins and Their Derived Lipovitellins in the Inshore Hagfish (Eptatretus burgeri)
| Autor: | Yasuyuki Kunihiro, Hiroyuki Inagawa, Osamu Nishimiya, Takashi Todo, Naoshi Hiramatsu, Akihiko Hara |
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| Rok vydání: | 2014 |
| Předmět: |
endocrine system
lipovitellin yolk protein food.ingredient Size-exclusion chromatography Vitellogenins Vitellogenin food Yolk biology.animal Eptatretus burgeri Animals Agnatha chemistry.chemical_classification biology Immunochemistry Egg Proteins biology.organism_classification Molecular biology Amino acid Gene Expression Regulation chemistry biology.protein Hagfishes Animal Science and Zoology Vitellogenesis vitellogenin Hagfish |
| Zdroj: | Zoological Science. 31:251-257 |
| ISSN: | 0289-0003 |
| Popis: | Vitellogenesis has been extensively studied in oviparous vertebrates, including teleost fishes, while not much is known with regard to jawless hagfishes, modern representatives of the most primitive vertebrate class. This study aimed to characterize vitellogenin (Vtg) and yolk protein (YP) in the inshore hagfish (Eptatretus burgeri) as an initial step to understand vitellogenesis in this species. A putative Vtg fraction was purified from the serum of female hagfish by combinations of hydroxylapatite and ion-exchange chromatography, followed by gel filtration. The purified fraction appeared to contain two distinct Vtgs (Vtg1 and Vtg2) and exhibited biochemical properties resembling those previously reported for teleost Vtgs; these appeared to be female-specific serum proteins and high-molecular-weight proteins in gel filtration (similar to 505 kDa as the mixture fraction of both Vtgs) and in SDS-PAGE (Vtg1 and Vtg2; similar to 210 kDa and similar to 195 kDa, respectively). A major YP was also purified from hagfish eggs by combinations of hydroxylapatite chromatography and gel filtration; the apparent native mass of the purified YP was unusually large (>669 kDa). The purified YP consisted of four polypeptides in SDS-PAGE; the peptide pattern indicated that it consisted of two lipovitellins (Lv1 and Lv2) giving rise to two sets of heavy chains (similar to 116 kDa and similar to 106 kDa, respectively) and two light chains (similar to 32 kDa and similar to 28 kDa, respectively). Additional immunological analysis, N-terminal amino acid sequencing and cDNA cloning firmly confirmed the precursor-product relationship between hagfish Vtgs and Lvs. |
| Databáze: | OpenAIRE |
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