title: Crystallization and preliminary X-ray analysis of squid neuronal Sec1.
abstract: Sec1 protein family members are involved in the regulation of all intracellular SNARE-mediated (SNARE = soluble N-ethylmaleimide-sensitive fusion protein attachment protein receptor) vesicle-fusion processes in a step preceding membrane fusion and have been shown to interact with t-SNAREs. To better understand the structural basis and the role of Sec1 in the regulation of the SNARE-complex formation, neuronal Sec1 from the squid Loligo pealei has been expressed and crystallized; this invertebrate protein shows a high sequence homology to the human neuronal Sec1, Munc18a. Here, the production of diffraction-quality native crystals, which belong to space group P3(1)21 and diffract to 3.3 A resolution, is described. In addition, selenomethionyl n-Sec1 crystals in space groups P3(1)21 and P2(1) have been generated. Preliminary analysis of the monoclinic space group indicates that these crystals diffract to a resolution higher than 2.5 A.
authors.affiliation: European Molecular Biology Laboratory (EMBL), 6 Rue Jules Horowitz, 38000 Grenoble, France.
authors.forename: A
authors.initials: A
authors.lastname: Bracher
authors.forename: T
authors.initials: T
authors.lastname: Dresbach
authors.forename: H
authors.initials: H
authors.lastname: Betz
authors.forename: W
authors.initials: W
authors.lastname: Weissenhorn
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D049832:Decapodiformes; D004926:Escherichia coli; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism; D051938:Munc18 Proteins; D009419:Nerve Tissue Proteins / Q000737:chemistry* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry; D052067:Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins; D013572:Synaptic Vesicles; D033921:Vesicular Transport Proteins
chemical_list: D002352:Carrier Proteins; D008565:Membrane Proteins; D051938:Munc18 Proteins; D009419:Nerve Tissue Proteins; D011993:Recombinant Fusion Proteins; D052067:Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins; D033921:Vesicular Transport Proteins