Beclin-1 (Beclin1)

Beclin-1 is a scaffolding protein crucial for initiating autophagy in mammalian cells, encoded by the BECN1 gene in humans[1][5]. It is the mammalian ortholog of yeast Atg6, and interacts with class III phosphoinositide 3-kinase (PI3K) complexes and Bcl-2 family proteins to regulate both autophagy and apoptosis[1][3][5]. Structurally, Beclin-1 contains an N-terminal intrinsically disordered region (with a Bcl-2 homology 3/BH3 domain), a central coiled-coil domain that mediates protein interactions, and a C-terminal evolutionarily conserved (BARA/ECD) domain with membrane-binding properties crucial for autophagic function[1][2][3]. Beclin-1 serves as a hub for membrane trafficking and signal integration, orchestrating the formation and maturation of autophagosomes by recruiting and regulating key autophagy proteins such as VPS34, VPS15, UVRAG, and ATG14[1][3]. It is implicated in multiple disease processes—including cancer (as a haploinsufficient tumor suppressor), neurodegenerative disorders, and inflammation—largely due to its central role in maintaining cellular homeostasis by promoting proper turnover of cellular components and regulating cell death[3][5]. Loss or mutation of Beclin-1 is associated with increased tumor development, impaired autophagy, and defective cellular clearance pathways[5].

Other names

Beclin1BECN1Autophagy-related protein 6 (ATG6)Beclin-1Beclin 1

Induction of autophagy via increased Beclin-1 expression or activity, Modulation of protein-protein interactions in the autophagy machinery