Selective Tryptophan Modification with Rhodium Carbenoids in Aqueous Solution (original) (raw)

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Journal of the American Chemical Society

CommunicationJuly 30, 2004

Selective Tryptophan Modification with Rhodium Carbenoids in Aqueous Solution

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Journal of the American Chemical Society

Cite this: J. Am. Chem. Soc. 2004, 126, 33

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Abstract

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A new transition metal-based reaction has been developed for the selective modification of tryptophan residues on protein substrates. After activation of vinyl-substituted diazo compounds by Rh2(OAc)4, the resulting metallocarbenoid intermediates were found to modify indoles in aqueous media despite competing reactions with water. Both _N_- and _2_-substituted indole products were observed in the reaction. Following initial small-molecule studies, the reaction was performed on two protein substrates. Both myoglobin and subtilisin Carlsberg were modified readily in aqueous solution, and the tryptophan selectivity of the reactions was confirmed through MS analyses of trypsin digest fragments. It was also demonstrated that myoblobin concentrations as low as 10 μM still led to appreciable levels of modification. Reconstitution experiments confirmed that myoglobin retained its ability to bind heme following modification.

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