Design of dantrolene-derived probes for radioisotope-free photoaffinity labeling of proteins involved in the physiological Ca2+ release from sarcoplasmic reticulum of skeletal muscle.

Bifunctional dantrolene derivatives have been synthesized as probes for radioisotope-free photoaffinity labeling with the aim of elucidating the molecular mechanism of skeletal muscle contraction. GIF-0430 and GIF-0665 are aromatic azido-functionalized derivatives that were designed to selectively inhibit physiological Ca2+ release (PCR) from sarcoplasmic reticulum (SR) in mouse skeletal muscle without a strong effect on Ca2+-induced Ca2+ release (CICR). These photoaffinity probes consist of either an azidomethyl or an ethynyl group, respectively, which could function as a tag for introduction of an optional detectable marker unit by an appropriate chemoselective ligation method after the photo-cross-linking operation. Actually, the former probe worked to photolabel its target proteins specifically as confirmed by subsequent fluorescent visualization.

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