SNRK
SNRK, SNF1-related kinase, is an AMPK-related kinase activated by LKB1 that is broadly expressed with notable abundance in testis, brain, and heart. In male germ cells, genetic loss in mouse models disrupts spermatid development and causes male subfertility, and the reported substrate selenium-binding protein 1 connects SNRK to poorly characterized metabolic pathways in germ cells. Cardiac studies implicate SNRK in metabolic gene regulation and mitochondrial function, with knockout models showing altered cardiac energetics. Unlike many AMPK relatives, SNRK lacks obvious accessory domains, implying regulation purely through phosphorylation and protein interactions, and its biology remains less charted than the flagship AMPK pathway.
