Photolabile protecting groups are widely used to trigger oligonucleotide activity. The ON/OFF-amplitude is a critical parameter. An experimental setup has been developed to identify protecting group derivatives with superior caging properties. Bulky rests are attached to the cage moiety via Cu-catalyzed azide-alkyne cycloaddition post-synthetically on DNA. Interestingly, the decrease in melting temperature upon introducing o-nitrobenzyl-caged (NPBY-) and diethylaminocoumarin-cages (DEACM-) in DNA duplexes reaches a limiting value. NMR spectroscopy was used to characterize individual base-pair stabilities and determine experimental structures of a selected number of photocaged DNA molecules. The experimental structures agree well with structures predicted by MD simulations. Combined, the structural data indicate that once a sterically demanding group is added to generate a tri-substituted carbon, the sterically less demanding cage moiety points towards the neighboring nucleoside and the bulkier substituents remain in the major groove.
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