Folliculin-interacting protein 1 (FNIP1)

Folliculin-interacting protein 1 (FNIP1) is a highly conserved cytoplasmic scaffold and adaptor protein integral to the regulation of energy and nutrient sensing in cells[1][3][4]. FNIP1 forms complexes with folliculin (FLCN) and adenosine monophosphate-activated protein kinase (AMPK), critically influencing the mTOR and AMPK signaling pathways, which direct cellular metabolism, organelle homeostasis, autophagy, and cellular stress responses[3][4][5][7]. FNIP1 also functions as a co-chaperone, inhibiting the ATPase activity of Hsp90, modulating its chaperone cycle, and stabilizing or activating various client proteins[1][4]. FNIP1 is widely expressed in human tissues—especially in energy-demanding organs such as kidneys, heart, thyroid, and brain—and is essential for adaptation to nutrient fluctuations[2][3][4]. Dysregulation of FNIP1 or its interacting network contributes to cancer (notably renal carcinoma), cardiovascular diseases, and some genetic disorders. Although FNIP1 is a promising therapeutic and diagnostic target due to its central role in metabolic and proliferative pathways, there are currently no approved drugs or agents specifically targeting this protein[4].

Other names

KIAA1961IMD93folliculin-interacting protein 1

Modulation of cellular energy metabolism via interaction with AMPK/mTOR pathways Regulation of mitochondrial function and autophagy