Publication: A shrimp pacifastin light chain-like inhibitor: Molecular identification and role in the control of the prophenoloxidase system
Issued Date
2016-01-01
Resource Type
ISSN
18790089
0145305X
0145305X
Other identifier(s)
2-s2.0-84940562169
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Mahidol University
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SCOPUS
Bibliographic Citation
Developmental and Comparative Immunology. Vol.54, No.1 (2016), 32-45
Suggested Citation
Pakkakul Sangsuriya, Walaiporn Charoensapsri, Sudarat Chomwong, Saengchan Senapin, Anchalee Tassanakajon, Piti Amparyup A shrimp pacifastin light chain-like inhibitor: Molecular identification and role in the control of the prophenoloxidase system. Developmental and Comparative Immunology. Vol.54, No.1 (2016), 32-45. doi:10.1016/j.dci.2015.08.003 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/43224
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Title
A shrimp pacifastin light chain-like inhibitor: Molecular identification and role in the control of the prophenoloxidase system
Abstract
© 2015 Elsevier Ltd. Pacifastin is a recently classified family of serine proteinase inhibitors that play essential roles in various biological processes, including in the regulation of the melanization cascade. Here, a novel pacifastin-related gene, termed PmPacifastin-like, was identified from a reverse suppression subtractive hybridization (SSH) cDNA library created from hemocytes of the prophenoloxidase PmproPO1/2 co-silenced black tiger shrimp Penaeus monodon. The full-length sequences of PmPacifastin-like and its homologue LvPacifastin-like from the Pacific white shrimp Litopenaeus vannamei were determined. Sequence analysis revealed that both sequences contained thirteen conserved pacifastin light chain domains (PLDs), followed by two putative kunitz domains. Expression analysis demonstrated that the PmPacifastin-like transcript was expressed in all tested shrimp tissues and larval developmental stages, and its expression responded to Vibrio harveyi challenge. To gain insight into the functional roles of PmPacifastin-like protein, the in vivo RNA interference experiment was employed; the results showed that PmPacifastin-like depletion strongly increased PO activity. Interestingly, suppression of PmPacifastin-like also down-regulated the expression of the proPO-activating enzyme PmPPAE2 transcript; the PmPacifastin-like transcript was down-regulated after the PmproPO1/2 transcripts were silenced. Taken together, these results suggest that PmPacifastin-like is important in the shrimp proPO system and may play an essential role in shrimp immune defense against bacterial infection. These results also expand the knowledge of how pacifastin-related protein participates in the negative regulation of the proPO system in shrimp.