Investigation of photoinduced reactivity of Glue-FITC: 1- Absorption spectra: Glue-FITC 3µM + BSA 10µM in Tris-HCl buffer (Tris – 20mM, pH- 7.0)

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Investigation of photoinduced reactivity of Glue-FITC: 1- Absorption spectra: Glue-FITC 3µM + BSA 10µM in Tris-HCl buffer (Tris – 20mM, pH- 7.0) + UV irradiation (305-315nm band pass filter) Observed decrease in the absorption intensity at 270-320 nm. Due to the photochemical covalent binding of benzophenone (BP) with protein. Glue+ BSA Glue BSA

2- Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE)

3- Kinesin/microtubule biomachinery system: + MT + MT +Glue-FITC + UV irradiation + Glue + UV irradiation Kinesin + Cy5 labeled microtubules Glue-FITC UV irradiation.

BP is essential for the covalent immobilization:

Optical tweezers: To investigate the change in the binding strength between kinesin and the microtubules upon adhesion with glue and subsequent photoclicking. Bright field microscopy traces:

Conclusion: Study demonstrated that water soluble GlueBP-FITC can serve as a photoclickable molecular glue that covalently attaches to proteins. As studied by “optical tweezers”, the temporal-to-permanent photochemical transformation gives rise to a notable change in binding strength. Protein-Glue study (with BSA and kinesin) shows that, both non covalent and covalent interaction affects the secondary structure of the proteins or their biological functions. Glue might be a potent candidate for the development of targeted cancer therapy.