Comparative Analysis of the Reactivity of Diazirine-Based Photoaffinity Probes toward a Carbohydrate-Binding Protein

A set of lactose-based photoaffinity probes bearing either alkyl diazirine or trifluoromethylphenyl diazirine (TPD) groups were designed and synthesized to directly compare their efficiency in photocrosslinking a carbohydrate-binding protein. The crosslinking efficiency of the TPD probes was higher than the alkyl diazirine probes when reacted with a single binding protein. However, the alkyl diazirine probe with a small alkyne tag achieved more selective photoaffinity labeling of a binding protein in cell lysate than the corresponding TPD probe.

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