a spytag-spycatcher complex with gold nanoparticles

spy protein peptide labeling biotechnology engineering bonding research splice technology biology three dimensional molecular structure white background conjugation biological process cut attached connection merging molecule chemical formula biochemistry gold colored metal nanotechnology nanoparticle nanomedicine spytag spycatcher tag catcher complex short sequence tool larger irreversible interaction technique unite assemble covalent bond couple purification combine isopeptide golden nanoparticles conjugate bioconjugation aurum attach isolated biomolecules connect domain molecules 3d join link rendering