KFERQmotif

The KFERQ motif is a short amino acid sequence found in proteins that serves as a recognition signal for selective protein degradation. This pentapeptide, characterized by the amino acid sequence KFERQ (Lysine-Phenylalanine-Glutamate-Arginine-Glutamine), acts as a tag. Proteins containing this motif are often targeted by the cellular machinery responsible for autophagy, a process where the cell degrades damaged or unnecessary components. Specifically, the KFERQ motif is recognized by a protein called N-terminal of the 70 kDa heat shock protein (Hsc70), which then facilitates the transport of the tagged protein to the lysosome for degradation. This selective degradation pathway, often referred to as KFERQ-mediated autophagy or selective autophagy, plays a crucial role in maintaining cellular homeostasis by removing misfolded, damaged, or excess proteins. Dysregulation of this pathway has been implicated in various diseases, including neurodegenerative disorders and cancer. The identification and understanding of the KFERQ motif have opened avenues for therapeutic strategies aimed at modulating protein degradation for disease treatment.