A novel snare N-terminal domain revealed by the crystal structure of Sec22b - PubMed (original) (raw)

. 2001 Jun 29;276(26):24203-11.

doi: 10.1074/jbc.M101584200. Epub 2001 Apr 17.

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• PMID: 11309394
• DOI: 10.1074/jbc.M101584200

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A novel snare N-terminal domain revealed by the crystal structure of Sec22b

L C Gonzalez Jr et al. J Biol Chem. 2001.

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Abstract

Intra-cellular membrane fusion is facilitated by the association of SNAREs from opposite membranes into stable alpha-helical bundles. Many SNAREs, in addition to their alpha-helical regions, contain N-terminal domains that likely have essential regulatory functions. To better understand this regulation, we have determined the 2.4-A crystal structure of the 130-amino acid N-terminal domain of mouse Sec22b (mSec22b), a SNARE involved in endoplasmic reticulum/Golgi membrane trafficking. The domain consists of a mixed alpha-helical/beta-sheet fold that resembles a circular permutation of the actin/poly-proline binding protein, profilin, and the GAF/PAS family of regulatory modules. The structure is distinct from the previously characterized N-terminal domain of syntaxin 1A, and, unlike syntaxin 1A, the N-terminal domain of mSec22b has no effect on the rate of SNARE assembly in vitro. An analysis of surface conserved residues reveals a potential protein interaction site. Key residues in this site are distinct in two mammalian Sec22 variants that lack SNARE domains. Finally, sequence analysis indicates that a similar domain is likely present in the endosomal/lysosomal SNARE VAMP7.

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