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Recombinant spider silk is composed entirely of protein, primarily the amino acids glycine and alanine, and contains no spider DNA in the final fiber or powder product.
Composition of Recombinant Spider Silk
The final material is a protein fiber (spidroin) made of repeating polypeptide motifs. Its key components are:
Amino Acids: Glycine and alanine are the most abundant amino acids, often making up more than 60% of the protein sequence. Glycine-rich regions contribute to elasticity, while alanine-rich blocks form strong beta-sheet crystalline structures.
Protein Domains: The proteins consist of large central repetitive regions flanked by non-repetitive N- and C-terminal domains that are crucial for the natural fiber assembly process.
Lack of DNA: The production process involves isolating and purifying the protein from the host organism (like bacteria, yeast, or transgenic animals). This purification process removes all cellular components, including DNA, resulting in a pure protein product.
Percentage of Spider DNA
The percentage of spider DNA in the final product is zero (0%).
The term "recombinant" refers to the fact that the gene sequence (DNA) encoding the spider silk protein has been inserted into another organism for large-scale production. This DNA is a template used by the host organism's cellular machinery to produce the silk protein. The DNA itself is a tool for production, not a component of the final silk material.
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