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Recombinant SNARE proteins expression and purification.Recombinant VAMP (lacking the transmembrane segment) and full-length syntaxin were expressed as GST fusion proteins in the E. coli strains BL21 DE3 and C43, respectively.
Protein expression was induced with 1 mM IPTG for 5 h at 301C, and purified from bacterial extracts by affinity chromatography on glutathione agarose as described Reference 11. Resin-bound fusion proteins were released by digestion with thrombin protease (Pharmacia) for 2 h at 230C Reference 11. Proteins concentration was assayed with the BCA kit (Pierce), and purity verified by gel analysis. In vitro expression of SNAP-25In vitro translation of the cDNA clone coding for SNAP25 from rat brain in the presence of [35S] methionine involved a transcription-translation-coupled reticulocyte lysate system (Promega) as described Reference 12. In vitro reconstitution of SNARE complex and modulation by ARGIRELINESNARE complex was reconstituted using the recombinant VAMP and syntaxin proteins and in vitro translated [35S] SNAP-25. Briefly, equimolar amounts of VAMP and syntaxin were incubated in the absence of presence of the hexapeptide for 2 h at 40C. Thereafter, SNAP-25 was added to the mixture and the reaction proceeded for 3 h at 40C. Complex assembly was stopped by addition of SDS-PAGE sample buffer. Samples were analyzed by SDS-PAGE on 12% gels, followed by fluorographic detection on Kodak X-Omat AR x-ray films. For further clinical data on Argireline®
The anti-wrinkle and anti-aging properties of this hexapeptideAt a 10% inclusion rate of this non-toxic, non-irritant hexapeptide molecule, is was noted that it modulates the excessive stimulation of the facial muscles, relaxing facial tension and reduces the depth of already formed wrinkles. For more on the effect that of our Créme de Vie has on your skin and on wrinkles, please click here. Active ingredients used in Créme de Vie |
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