Solubility-enhanced gMYL6 fused with a hexa-lysine tag promotes the cytotoxicity of human NK cells

Goat myosin light chain 6 (gMYL6) is a constituent of certain extracted immunization-induced goat anti-cancer bioactive peptides (ACBPs). However, little is known about its activity onto NK cells which are the basic cellular attackers in cancer immunotherapy for patients with malignancies. Because of the complicated extraction process and low yield of gMYL6 out of the goat ACBPs' mixture, the Nano-flow liquid chromatography and C-terminal polycationic tag expression strategy were used to identify and enrich the peptide to investigate its bioactivity against cancers/tumors. The solubility-enhanced gMYL6 fused with a hexa-lysine tag showed a capacity of promoting the NK cells' cytotoxicity, making it a novel promising heterogeneous peptide cytokine against cancers.