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- W2022704511 abstract "The fusion of cellular membranes comprises several steps; membrane attachment requires priming of SNAREs and tethering factors by Sec18p/NSF (N-ethylmaleimide sensitive factor) and LMA1. This leads to trans-SNARE pairing, i.e. formation of SNARE complexes between apposed membranes. The yeast vacuole system has revealed two subsequent molecular events: trans-complex formation of V-ATPase proteolipid sectors (V(0)) and release of LMA1 from the membrane. We have now identified a hetero-oligomeric membrane integral complex of vacuolar transporter chaperone (Vtc) proteins integrating these events. The Vtc complex associates with the R-SNARE Nyv1p and with V(0). Subunits Vtc1p and Vtc4p control the initial steps of fusion. They are required for Sec18p/NSF activity in SNARE priming, membrane binding of LMA1 and V(0) trans-complex formation. In contrast, subunit Vtc3p is required for the latest step, LMA1 release, but dispensible for all preceding steps, including V(0) trans-complex formation. This suggests that Vtc3p might act close to or at fusion pore opening. We propose that Vtc proteins may couple ATP-dependent NSF activity to a subset of V(0) sectors in order to activate them for V(0) trans-complex formation and/or control fusion pore opening." @default.
- W2022704511 created "2016-06-24" @default.
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- W2022704511 date "2002-02-01" @default.
- W2022704511 modified "2023-10-03" @default.
- W2022704511 title "The Vtc proteins in vacuole fusion: coupling NSF activity to V<sub>0</sub><i>trans</i>-complex formation" @default.
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- W2022704511 doi "https://doi.org/10.1093/emboj/21.3.259" @default.
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