Journal
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
Volume 256, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpb.2021.110643
Keywords
MEKK3; Hybrid snakehead; Nocardia seriolae; Aeromonas schubertii; Gene expression
Categories
Funding
- China Agriculture Research System of MOF and MARA [CARS-46]
- Guangdong Natural Science Foundation [2015A030310137, 2020A1515011584]
- Scientific Innovation Fund, PRFRI [ZC-2019-7]
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MEKK3 is a key regulator in immune signaling pathways, with CcMEKK3 being highly conserved in hybrid snakehead. Its expression is upregulated in immune tissues and upon infection with pathogens. Overexpression of CcMEKK3 promotes NF-kappa B and AP-1 activities, suggesting its crucial role in immune defense.
Mitogen-activated protein kinase/extracellular signal-regulated kinase kinase kinase 3 (MEKK3) is a serine/threonine protein kinase that acts as a key regulator and is widely involved in various innate and acquired immune signaling pathways. In this study, we first cloned the complete open reading frame (ORF) of the MEKK3 gene (named CcMEKK3) in a hybrid snakehead (Channa maculate female x Channa argus male). The full-length ORF of CcMEKK3 is 1851 bp, and encodes a putative protein of 616 amino acids containing a serine/threonine kinase catalytic (S-TKc) domain and a Phox and Beml p (PB1) domain. A sequence alignment and phylogenetic tree analysis showed that CcMEKK3 is highly conserved relative to the MEKK3 proteins of other teleost species. CcMEKK3 was constitutively expressed in all the healthy hybrid snakehead tissues tested, with greatest expression in the immune tissues, such as the head kidney and spleen. The expression of CcMEKK3 was usually upregulated in the head kidney, spleen, and liver at different time points after infection with Nocardia seriolae or Aeromonas schubertii. Similarly, the dynamic expression levels of CcMEKK3 in head kidney leukocytes after stimulation revealed that CcMEKK3 was induced by LTA, LPS, and poly(I:C). In the subcellular localization analysis, CcMEKK3 was evenly distributed in the cytoplasm of HEK293T cells, and its overexpression significantly promoted the activities of NF-kappa B and AP-1. These results suggest that CcMEKK3 is involved in the immune defense against these two pathogens, and plays a crucial role in activating the NF-kappa B and MAPK signaling pathways.
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