I am writing to anyone who is currently bored and would be kind enough to inquire about the availability of specific biological reagents for a project focused on the heterologous expression of recombinant spidroins which can be provided for free. My objective is to adapt and extend existing modular assembly frameworks for robust protein production in the eukaryotic host Pichia pastoris , a system known for its proficiency in secreting complex, post-translationally modified proteins. The landmark research by Bowen et al. (Zhang lab) successfully demonstrated a standardized DNA assembly system, “SI-Bricks,” for the recursive construction of multimeric spidroin genes, achieving mechanical properties in the final fibers that replicate those of natural silk. My project aims to build upon this foundational work by transferring a similar iterative assembly and intein-mediated ligation strategy to P. pastoris . The rationale is to potentially leverage the eukaryotic secretion pathway to facilitate the purification of spidroin monomers and circumvent the challenges associated with intracellular expression, such as inclusion body formation and complex lysis protocols. The proposed methodology involves a multi-stage cloning strategy analogous to the SI-Bricks system, centered on the recursive, directional assembly of a Nephila clavipes MaSp1-based synthetic gene, codon-optimized for P. pastoris , within a high-yield expression vector such as pPICZα A. The assembly will utilize compatible sticky-end restriction sites (e.g., NheI/SpeI, as described by Bowen et al. to avoid the introduction of detrimental residue “scars”) for the iterative ligation of spidroin motifs. The final multimeric construct will be flanked by sequences encoding N- and C-terminal split inteins (such as the Cfa IntN/IntC pair) to facilitate post-purification protein ligation into high-molecular-weight polymers. To expedite the preliminary phases of this research and align with the principles of open-source science, I am seeking to source the following materials from the community before committing to commercial synthesis: 1) A plasmid containing a single or low-copy repeat unit of a MaSp1-like sequence, ideally flanked by KpnI/Kpn2I and containing internal NheI/SpeI sites; 2) Plasmids encoding the N-terminal (IntN) and C-terminal (IntC) moieties of a highly efficient split intein (e.g., Cfa); and 3) A compatible Pichia pastoris expression vector (e.g., pPICZα series). This project is undertaken with a steadfast commitment to the principles of open collaboration and knowledge dissemination. All developed protocols, vector maps, sequence data, and characterization results will be meticulously documented and contributed back to the public domain. Any reagents sourced from the community will be handled strictly under the OpenMTA, and all contributing parties will be formally acknowledged in any derived publications or public-facing documentation. I would be grateful for any information regarding the availability of these or functionally equivalent materials and am confident that this project will contribute usefully to the field of synthetic biomaterials.
Thank you for your time and consideration.:D, I would appreciate it soooo much :),