Expanding the genetic code of Escherichia coli with phosphoserine.

Expanding the genetic code of Escherichia coli with phosphoserine.
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DOI:
10.1126/science.1207203
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发表时间:
2011-08-26
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Söll D
Söll D
中科院分区:
其他
文献类型:
--
作者:
Park HS;Hohn MJ;Umehara T;Guo LT;Osborne EM;Benner J;Noren CJ;Rinehart J;Söll D

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O -Phosphoserine (Sep), the most abundant phosphoamino acid in the eukaryotic phosphoproteome, is not encoded in the genetic code, but synthesized posttranslationally. Here, we present an engineered system for specific cotranslational Sep incorporation (directed by UAG) into any desired position in a protein by an Escherichia coli strain that harbors a Sep-accepting transfer RNA (tRNASep), its cognate Sep–tRNA synthetase (SepRS), and an engineered EF-Tu (EF-Sep). Expanding the genetic code rested on reengineering EF-Tu to relax its quality-control function and permit Sep-tRNASep binding. To test our system, we synthesized the activated form of human mitogen-activated ERK activating kinase 1 (MEK1) with either one or two Sep residues cotranslationally inserted in their canonical positions (Sep218, Sep222). This system has general utility in protein engineering, molecular biology, and disease research.
时空信号传导:蛋白质聚集在一起以及它们分开的位置。
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