= SNARE complex
{c}
A <SNARE complex> is an assembly of complementary <SNARE proteins>, commonly forming a four-helix bundle. A trans complex bridges opposing membranes and can promote <membrane fusion>; after fusion, its components occupy the same membrane in a cis complex. ATP-dependent disassembly permits component reuse. This distinction explains why detecting a complex alone does not determine whether it is a fusion intermediate or a product remaining after fusion. <SNAREpins: minimal machinery for membrane fusion by T. Weber and others>[Weber and others, 1998, SNAREpins linking two membranes]{ref}
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