Spider Silk Assembly

The unique composition of spider silk, specifically dragline silk, exhibits high tensile strength and toughness, enabling its usage for spider lifelines and web frames. Potential uses of synthetic spider silk include clothing, medical sutures, procedures to replace ligaments, and optical instruments. Previous studies highlight major ampullate spidroin proteins, MaSp1 and MaSp2, and cysteine-rich proteins (CRP), including CRP1, as the primary composition of dragline silk in black widow spiders. The trigger and processes that govern spider silk assembly, which involves the phase transition from a liquid crystal to a solid structure, require further elucidation. In order to further explore the trigger mechanism, we conducted research to determine whether MaSp1 and CRP1 are subjugated to a redox trigger mechanism. Prokaryotic expression plasmids were designed and generated to express MaSp1 and CRP1, and the recombinant proteins were purified through affinity chromatography. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis, followed by Western blot analysis and mass spectrometry, was performed to visualize the purified proteins and investigate the potential for disulfide bond formation between CRP1 and MaSp1 through protein oxidation. Further studies will involve identifying methods that integrate the trigger mechanism to produce dragline silk of higher tensile strength for commercial and large-scale industrial applications.