New aldehyde tag sequences identified by screening formylglycine generating enzymes in vitro and in vivo.

Journal of the American Chemical Society
Jason S Rush, Carolyn R Bertozzi

Abstract

Formylglycine generating enzyme (FGE) performs a critical posttranslational modification of type I sulfatases, converting cysteine within the motif CxPxR to the aldehyde-bearing residue formylglycine (FGly). This concise motif can be installed within heterologous proteins as a genetically encoded "aldehyde tag" for site-specific labeling with aminooxy- or hydrazide-functionalized probes. In this report, we screened FGEs from M. tuberculosis and S. coelicolor against synthetic peptide libraries and identified new substrate sequences that diverge from the canonical motif. We found that E. coli's FGE-like activity is similarly promiscuous, enabling the use of novel aldehyde tag sequences for in vivo modification of recombinant proteins.

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Methods Mentioned

BETA
fluorescence imaging
peptide library

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