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Photoinduced Bioorthogonal 1,3-Dipolar Poly-cycloaddition Promoted by Oxyanionic Substrates for Spatiotemporal Operation of Molecular Glues

PGluePZ, a pyrazoline (PZ)‐based fluorescent adhesive which can be generated spatiotemporally in living systems, was developed. Since PGluePZ carries many guanidinium ion (Gu+) pendants, it strongly adheres to various oxyanionic substrates through a multivalent salt‐bridge interaction. PGluePZ is gi...

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Published in:Angewandte Chemie International Edition 2016-01, Vol.55 (1), p.193-198
Main Authors: Hatano, Junichi, Okuro, Kou, Aida, Takuzo
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description PGluePZ, a pyrazoline (PZ)‐based fluorescent adhesive which can be generated spatiotemporally in living systems, was developed. Since PGluePZ carries many guanidinium ion (Gu+) pendants, it strongly adheres to various oxyanionic substrates through a multivalent salt‐bridge interaction. PGluePZ is given by bioorthogonal photopolymerization of a Gu+‐appended monomer (GlueTZ), bearing tetrazole (TZ) and olefinic termini. Upon exposure to UV light, GlueTZ transforms into a nitrileimine (NI) intermediate (GlueNI), which is eligible for 1,3‐dipolar polycycloaddition. However, GlueNI in aqueous media can concomitantly be deactivated into GlueWA by the addition of water, and the polymerization hardly occurs unless GlueNI is concentrated. We found that, even under high dilution, GlueNI is concentrated on oxyanionic substrates to a sufficient level for the polymerization, so that their surfaces can be point‐specifically functionalized with PGluePZ by the use of a focused beam of UV light. Stuck on glue: Novel photoinduced bioorthogonal polymerization of a guanidinium ion (Gu+) appended water‐soluble monomer was developed. It allows, by use of a focused beam of UV light, spatiotemporal functionalization of oxyanionic substrates, such as DNA and living cells as well as silica and latex nanoparticles, with the fluorescent molecular glue PGluePZ.
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Since PGluePZ carries many guanidinium ion (Gu+) pendants, it strongly adheres to various oxyanionic substrates through a multivalent salt‐bridge interaction. PGluePZ is given by bioorthogonal photopolymerization of a Gu+‐appended monomer (GlueTZ), bearing tetrazole (TZ) and olefinic termini. Upon exposure to UV light, GlueTZ transforms into a nitrileimine (NI) intermediate (GlueNI), which is eligible for 1,3‐dipolar polycycloaddition. However, GlueNI in aqueous media can concomitantly be deactivated into GlueWA by the addition of water, and the polymerization hardly occurs unless GlueNI is concentrated. We found that, even under high dilution, GlueNI is concentrated on oxyanionic substrates to a sufficient level for the polymerization, so that their surfaces can be point‐specifically functionalized with PGluePZ by the use of a focused beam of UV light. Stuck on glue: Novel photoinduced bioorthogonal polymerization of a guanidinium ion (Gu+) appended water‐soluble monomer was developed. 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subjects Addition polymerization
Adhesives
Adhesives - chemistry
Anions - chemistry
bioorganic chemistry
Cyclization
Cycloaddition
Cycloaddition Reaction
Deactivation
Dilution
Fluorescence
Glues
Guanidine - chemistry
Ion beams
Molecular Structure
noncovalent interactions
Particle Size
Photochemical Processes
photochemistry
Photopolymerization
Polymerization
Polymers - chemical synthesis
Polymers - chemistry
Pyrazoles - chemistry
Salts
Substrates
Surface Properties
Ultraviolet radiation
title Photoinduced Bioorthogonal 1,3-Dipolar Poly-cycloaddition Promoted by Oxyanionic Substrates for Spatiotemporal Operation of Molecular Glues
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