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Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein
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Characterization and function analysis of interleukin-1 receptor-associated kinase-1 (IRAK-1) from Fenneropenaeus

Youhou Xu1, Yucong Huang2, Shuanghu Cai2

  • 1Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, Qinzhou University, Qinzhou, China.

Fish & Shellfish Immunology
|December 28, 2016
PubMed

Insights

The red tail shrimp

Area of Science:

  • Aquatic immunology
  • Molecular biology
  • Crustacean research

Background:

  • Interleukin-1 receptor-associated kinase-1 (IRAK-1) is crucial for Toll-like receptor (TLR) signaling.
  • IRAK-1 acts as an adapter protein, linking MyD88 and TRAF6 in the TLR pathway.

Purpose of the Study:

  • To clone and characterize an IRAK-1 homolog from the red tail shrimp, Fenneropenaeus penicillatus (FpIRAK-1).
  • To investigate the role of FpIRAK-1 in the shrimp's immune response against viral and bacterial pathogens.

Main Methods:

  • Cloning of the FpIRAK-1 gene and analysis of its protein domains (death domain and serine/threonine kinase domain).
  • Homology analysis comparing FpIRAK-1 to other IRAK-1 sequences.
  • Real-time RT-PCR to assess FpIRAK-1 gene expression in various tissues and after pathogen challenge.
  • Gene knockdown experiments to evaluate FpIRAK-1 function in host defense.

Main Results:

  • FpIRAK-1 shares 71% similarity with Litopenaeus vannamei IRAK-1 and possesses key functional domains.
  • FpIRAK-1 is constitutively expressed in shrimp tissues and its expression is modulated by pathogen challenge.
  • Knockdown of FpIRAK-1 increases shrimp susceptibility to white spot syndrome virus (WSSV) and Vibrio alginolyticus.

Conclusions:

  • FpIRAK-1 plays a significant role in the Toll signaling pathway of Fenneropenaeus penicillatus.
  • FpIRAK-1 contributes to host defense against both viral (WSSV) and bacterial (V. alginolyticus) infections.

Keywords:
Expression analysisFenneropenaeus penicillatusFpIRAK-1Gene knockdownTLRs signaling pathway

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