Fe-TAMLs as a new class of small molecule peroxidase probes for correlated light and electron microscopy
Adams, S. R.; Mackey, M. R.; Ramachandra, R.; Deerinck, T. J.; Castillon, G. A.; Phan, S.; Hu, J.; Boassa, D.; Ngo, J. T.; Ellisman, M. H.
Show abstract
We introduce Fe-TAML, a small molecule-based peroxidase as a versatile new member of the correlated fluorescence and electron microscopy toolkit. The utility of the probe is demonstrated by high resolution imaging of newly synthesized DNA (through biorthogonal labeling), genetically tagged proteins (using HaloTag), and untagged endogenous proteins (via immunostaining). EM visualization in these applications is facilitated by exploiting Fe-TAMLs catalytic activity for the deposition of localized osmiophilic precipitates based on polymerized 3,3-diaminobenzidine. Optimized conditions for synthesizing and implementing Fe-TAML based probes are also described. Overall, Fe-TAML is a new chemical biology tool that can be used to visualize diverse biomolecular species along nanometer and micron scales within cells.
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