Sandbox Reserved 823: Difference between revisions
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[[Image:Layers.png|thumbnail||1100 px||left| '''Topology of the 16 layers of the SNARE complex''']] | [[Image:Layers.png|thumbnail||1100 px||left| '''Topology of the 16 layers of the SNARE complex''']] | ||
The centre of the four-helix bundle is constituted of '''16 layers'''. These layers are composed of | The centre of the four-helix bundle is constituted of '''16 layers'''. These layers are composed of <scene name='56/568021/Hydrophobis_side_chains/1'>hydrophobic side chains</scene>, which are perpendicular to the axis of the four-helix bundle, except for the central '''“0”-layer'''. This last one consists of '''three glutamine (Q)''' and '''one arginine (R)''' highly conserved residues. Those highly conserved residues have led to a new classification of SNAREs into '''Q- and R-SNAREs'''. <ref> PMID: 9861047 </ref> Almost all membrane fusion reactions require one R-SNARE and three Q-SNAREs: Qa, Qb and Qc.<ref> PMID: 11237004 </ref><ref> PMID: 11001046 </ref> In many cases, the R-SNARE is in the vesicle, and the three Q-SNAREs are in the target membrane. For the early endosomal SNARE complex, syntaxin 13, vti1a, syntaxin 6, and VAMP4 were respectively classified as Qa-, Qb-, Qc- and R-SNAREs. | ||
<scene name='56/568021/Hydrophobis_side_chains/1'>hydrophobic side chains</scene> | |||