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Leukocyte cell-derived chemotaxin 2 (LECT2) is a secretory cytokine that functions in many physiological and pathological processes. We used a Pichia pastoris expression system for the recombinant expression of rainbow trout LECT2. The recombinant LECT2 was purified by UNOsphere S Cation exchange and size-exclusion chromatography columns. The obtained target protein was highly pure (&gt;96% homogeneity) and the yield was &gt;120 mg/L of yeast cultures. An in vitro chamber assay revealed that recombinant LECT2 could induce chemotactic responses in rainbow trout head kidney-derived macrophages. Recombinant LECT2 not only enhanced macrophage respiratory burst activity and bactericidal activity, but also changed macrophage gene expression. In summary, we established a rapid and efficient method to prepare active recombinant rainbow trout LECT2 using a yeast expression system and column chromatography. Bioactive recombinant LECT2 is essential for studies on protein functions.

Yeast-based production, purification and bioactivity assay of rainbow trout LECT2