Regulated-SNARE-like domain
SMART accession number:SM01270
Description: Longin is one of the approximately 26 components required for transporting proteins from the ER to the plasma membrane, via the Golgi apparatus. It is necessary for the steps of the transfer from the ER to the Golgi complex (PUBMED:16855025). Longins are the only R-SNAREs that are common to all eukaryotes, and they are characterised by a conserved N-terminal domain with a profilin-like fold called a longin domain (PUBMED:15544955).
Interpro abstract (IPR010908):

VAMPs (and its homologue synaptobrevins) define a group of SNARE proteins that contain a C-terminal coiled-coil/SNARE domain, in combination with variable N-terminal domains that are used to classify VAMPs: those containing longin N-terminal domains (~150 aa) are referred to as longins, while those with shorter N-termini are referred to as brevins [ (PUBMED:12914952) ]. Longins are the only type of VAMP protein found in all eukaryotes, suggesting that their longin domain is essential. The longin domain is thought to exert a regulatory function. Longin domains have been shown to share the same structural fold, a profilin-like globular domain consisting of a five-stranded antiparallel beta-sheet that is sandwiched by an alpha-helix on one side, and two alpha-helices on the other (beta(2)-alpha-beta(3)-alpha(2)).

Family alignment:
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There are 6851 Longin domains in 6843 proteins in SMART's nrdb database.

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