Characterization, expression and localization of valosin-containing protein in ovaries of the giant tiger shrimp Penaeus monodon

Oct 8, 2013Gene

Distribution and levels of a key protein in the ovaries of giant tiger shrimp

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Abstract

The full-length cDNA of Valosin-containing protein (VCP) from the giant tiger shrimp measures 2,724 bp and encodes a protein of 788 amino acids.

PmVCP mRNA expression was higher in ovaries than in testes in both juvenile and broodstock shrimp.
Significant up-regulation of PmVCP was observed in stages II and IV ovaries of intact wild broodstock.
No differential expression of PmVCP was noted during ovarian development in eyestalk-ablated broodstock.
Progesterone injection did not affect PmVCP mRNA levels in the ovaries of 14-month-old shrimp.
Exogenous administration of 5-HT increased PmVCP mRNA in the ovaries of 18-month-old shrimp at 6 and 24 hours post-injection.
PmVCP localized in the ooplasm of previtellogenic oocytes, translocating to the germinal vesicle in vitellogenic oocytes.

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Valosin-containing protein (VCP), a member of the ATPase-associated with diverse cellular activity (AAA) family, was identified from the giant tiger shrimp (Penaeus monodon). The full-length cDNA of the PmVCP mRNA consisted of 2,724 bp containing an ORF of 2,367 bp corresponding to a deduced polypeptide of 788 amino acids. The deduced PmVCP protein contained two putative Cdc48 domains (positions 17-103, E-value=2.00e-36 and 120-186, E-value=3.60e-11) and two putative AAA domains (positions 232-368, E-value=3.67e-24 and 505-644, E-value=3.73e-25). PmVCP mRNA expression in ovaries was greater than that in testes in both juveniles and broodstock. PmVCP was significantly up-regulated in stages II and IV ovaries in intact wild broodstock (P<0.05) but it was not differentially expressed during ovarian development in eyestalk-ablated broodstock (P>0.05). The expression level of PmVCP mRNA in ovaries of 14-month-old shrimp was not affected by progesterone injection (0.1μg/g body weight, P>0.05). In contrast, exogenous 5-HT administration (50μg/g body weight) resulted in an increase of PmVCP mRNA in ovaries of 18-month-old shrimp at 6 and 24h post-injection (hpi) (P<0.05). The rPmCdc48-VCP protein and its polyclonal antibody were successfully produced. Cellular localization revealed that PmVCP was localized in the ooplasm of previtellogenic oocytes. Subsequently, it was translocated into the germinal vesicle of vitellogenic oocytes. Interestingly, PmVCP was found in nucleo-cytoplasmic compartments, in the cytoskeletal architecture and in the plasma membrane of mature oocytes in both intact and eyestalk-ablated broodstock.

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Characterization, expression and localization of valosin-containing protein in ovaries of the giant tiger shrimp Penaeus monodon

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