Protein stabilization utilizing a redefined codon.

Protein stabilization utilizing a redefined codon.
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DOI:
10.1038/srep09762
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发表时间:
2015-05-18
期刊:
影响因子:
4.6
通讯作者:
Sakamoto K
Sakamoto K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ohtake K;Yamaguchi A;Mukai T;Kashimura H;Hirano N;Haruki M;Kohashi S;Yamagishi K;Murayama K;Tomabechi Y;Itagaki T;Akasaka R;Kawazoe M;Takemoto C;Shirouzu M;Yokoyama S;Sakamoto K

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Recent advances have fundamentally changed the ways in which synthetic amino acids are incorporated into proteins, enabling their efficient and multiple-site incorporation, in addition to the 20 canonical amino acids. This development provides opportunities for fresh approaches toward addressing fundamental problems in bioengineering. In the present study, we showed that the structural stability of proteins can be enhanced by integrating bulky halogenated amino acids at multiple selected sites. Glutathione S-transferase was thus stabilized significantly (by 5.2 and 5.6 kcal/mol) with 3-chloro- and 3-bromo-l-tyrosines, respectively, incorporated at seven selected sites. X-ray crystallographic analyses revealed that the bulky halogen moieties filled internal spaces within the molecules, and formed non-canonical stabilizing interactions with the neighboring residues. This new mechanism for protein stabilization is quite simple and applicable to a wide range of proteins, as demonstrated by the rapid stabilization of the industrially relevant azoreductase.
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