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Ångstrom-size exocytotic fusion pore : implications for pituitary hormone secretionKreft, Marko ...In the past, vesicle content release was thought to occur immediately and completely after triggering of exocytosis. However, vesicles may merge with the plasma membrane to form an Ångstrom diameter ... fusion pore that prevents the exit of secretions from the vesicle lumen. The advantage of such a narrow pore is to minimize the delay between the trigger and the release. Instead of stimulating a sequence of processes, leading to vesicle merger with the plasma membrane and a formation of a fusion pore, the stimulus only widens the pre-established fusion pore. The fusion pore may be stable and may exhibit repetitive opening of the vesicle lumen to the cell exterior accompanied by a content discharge. Such release of vesicle content is partial (subquantal), and depends on fusion pore open time, diameter and the diffusibility of the cargo. Such transient mode of fusion pore opening was not confirmed until the development of the membrane capacitance patch-clamp technique, which enables high-resolution measurement of changes in membrane surface area. It allows millisecond dwell-time measurements of fusion pores with subnanometer diameters. Currently, the soluble N-ethylmaleimide-sensitive factor-attachment protein receptor (SNARE) proteins are considered to be key entities in end-stage exocytosis, and the SNARE complex assembly/disassembly may regulate the fusion pore. Moreover, lipids or other membrane constituents with anisotropic (non-axisymmetric) geometry may also favour the establishment of stable narrow fusion pores, if positioned in the neck of the fusion pore.Source: Molecular and cellular endocrinology. - ISSN 0303-7207 (Vol. 463, Mar. 2018, str. 65-71)Type of material - article, component part ; adult, seriousPublish date - 2018Language - englishCOBISS.SI-ID - 33207001
Author
Kreft, Marko |
Jorgačevski, Jernej |
Stenovec, Matjaž |
Zorec, Robert, 1958-
Topics
exocytosis |
fusion pore |
stability |
eksocitoza |
fuzija por |
stabilnost
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Kreft, Marko | 15666 |
Jorgačevski, Jernej | 27585 |
Stenovec, Matjaž | 15467 |
Zorec, Robert, 1958- | 03702 |
Source: Personal bibliographies
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