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Exocytotic fusion pore under stress [Elektronski vir]Chowdhury Haque, Helena ; Zorec, Robert, 1958-Exocytosis is a universal process of eukaryotic cells, consisting of fusion between the vesicle and the plasma membranes, leading to the for-mation of a fusion pore, a channel through which vesicle ... cargo exits into the extracellular space. In 1986, Rand and Parsegian proposed several stages to explain the nature of membrane fusion. Following stimulation, it starts with focused stress destabilization of membranes in contact, followed by the coa-lescence of two membrane surfaces. In the next fraction of a millisecond, restabilization of fused membranes is considered to occur to maintain the cell's integrity. This view predicted that once a fusion pore is formed, it must widen abruptly, irreversibly and fully, whereby the vesicle membrane com-pletely integrates with and collapses into the plasma membrane (full fusion exocytosis). However, recent experimental evidence has revealed that once the fusion pore opens, it may also reversibly close (transient or kiss-and-run exocytosis). Here, we present a historical perspective on understanding the mechanisms that initiate the membrane merger and fusion pore formation. Next, post-fusion mechanisms that regulate fusion pore stability are consid-ered, reflecting the state in which the forces of widening and constriction of fusion pores are balanced. Although the mechanisms generating these forces are unclear, they may involve lipids and proteins, including SNAREs, which play a role not only in the pre-fusion but also post-fusion stages of exocytosis. How molecules stabilize the fusion pore in the open state is key for a better understanding of fusion pore physiology in health and disease.Source: Cell stress. - ISSN 2523-0204 (Vol. 4, Aug. 2020, str. 218-226)Type of material - e-article ; adult, seriousPublish date - 2020Language - englishCOBISS.SI-ID - 24826627
Author
Chowdhury Haque, Helena |
Zorec, Robert, 1958-
Topics
exocytosis |
fusion pore |
SNARE proteins |
eksocitoza |
fuzijske pore |
proteini SNARE
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Chowdhury Haque, Helena | 18548 |
Zorec, Robert, 1958- | 03702 |
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