Porosome-associated protein complex

The porosome-associated protein complex, or simply the porosome, is a cup-shaped supramolecular structure located at the cell plasma membrane that serves as the universal machinery for secretion in eukaryotic cells (1.3.1, 1.3.4). It acts as the site where secretory vesicles transiently dock and fuse to release their contents via a highly regulated "kiss-and-run" mechanism, rather than through total vesicle collapse (1.3.5). The complex is composed of approximately 30 to 40 proteins, including SNAREs like syntaxin and SNAP-25, ion channels such as calcium and chloride channels, and cytoskeletal elements like actin and vimentin (1.2.1, 1.3.2). In various diseases, including Alzheimer's, cystic fibrosis, and diabetes, the porosome's structural integrity or function is compromised, leading to defective cellular communication and impaired neurotransmitter or hormone release (1.1.2, 1.4.1). Therapeutic approaches currently in development focus on restoring porosome function through organelle reconstitution, small molecule modulators, and AI-designed peptides that protect the complex from toxic aggregates like beta-amyloid (1.1.1, 1.2.2). These strategies aim to modify disease progression by addressing the root cause of secretory dysfunction at the cellular level (1.2.3, 1.4.2).

Other names

PorosomeSecretory portalFusion pore complexUniversal secretory machineryCup-shaped lipoprotein structure

Restoration of secretory function, Reconstitution of the porosome complex, Neutralization of toxic beta-amyloid, Modulation of vesicle hydration