5 years ago

Genetically encoding phosphotyrosine and its nonhydrolyzable analog in bacteria

Genetically encoding phosphotyrosine and its nonhydrolyzable analog in bacteria
Anzhi Yao, Yuhan Zhang, Sean A Reed, Mingchao Kang, Peng-Yu Yang, Hui Guo, Tao Liu, Claudio Zambaldo, Peter G Schultz, Ian A Wilson, Renhe Liu, Xiaozhou Luo, Jintang Du, Weimin Xuan, Xiaoxuan Lyu, Xueyong Zhu, Rongsheng E Wang, Guangsen Fu, Feng Wang, Chunhui Huang
Tyrosine phosphorylation is a common protein post-translational modification that plays a critical role in signal transduction and the regulation of many cellular processes. Using a propeptide strategy to increase cellular uptake of O-phosphotyrosine (pTyr) and its nonhydrolyzable analog 4-phosphomethyl-L-phenylalanine (Pmp), we identified an orthogonal aminoacyl-tRNA synthetase–tRNA pair that allows site-specific incorporation of both pTyr and Pmp into recombinant proteins in response to the amber stop codon in Escherichia coli in good yields. The X-ray structure of the synthetase reveals a reconfigured substrate-binding site, formed by nonconservative mutations and substantial local structural perturbations. We demonstrate the utility of this method by introducing Pmp into a putative phosphorylation site and determining the affinities of the individual variants for the substrate 3BP2. In summary, this work provides a useful recombinant tool to dissect the biological functions of tyrosine phosphorylation at specific sites in the proteome.

Publisher URL: http://dx.doi.org/10.1038/nchembio.2405

DOI: 10.1038/nchembio.2405

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