Engineering GST M2-2 for high activity with indene 1,2-oxide and indication of an H-site residue sustaining catalytic promiscuity.


:The substrate-binding H-site of human glutathione transferase (GST) M2-2 was subjected to iterative saturation mutagenesis in order to obtain an efficient enzyme with the novel epoxide substrate indene 1,2-oxide. Residues 10, 116, and 210 were targeted, and the activities with the alternative substrates, benzyl isothiocyanate and the prodrug azathioprine, undergoing divergent chemical reactions were monitored for comparison. In general, increased activities were found when the smaller residues Gly, Ser, and Ala replaced the original Thr210. The most active mutant T210G was further mutated at position 116, but no mutant showed enhanced catalytic activity. However, saturation mutagenesis of position 10 identified one double mutant T210G/I10C with 100-fold higher specific activity with indene 1,2-oxide than wild-type GST M2-2. This enhanced epoxide activity of 50 μmol min(-1) mg(-1) resulted primarily from an increased k(cat) value (70 s(-1)). The specific activity is 24-fold higher than that of wild-type GST M1-1, which is otherwise the most proficient GST enzyme with epoxide substrates. A second double mutant T210G/I10W displayed 30-fold increased activity with azathioprine, 0.56 μmol min(-1) mg(-1). In both double mutants, the replacement of Ile10 led to narrowed acceptance of alternative substrates. Ile10 is evolutionarily conserved in related class Mu GSTs. Conservation usually indicates preservation of a particular function, and in the Mu class, it would appear that the conserved Ile10 is not necessary to maintain catalytic functions but to prevent loss of broad substrate acceptance. In summary, our data underscore the facile transition between alternative substrate selectivity profiles in GSTs by a few mutations.


J Mol Biol


Norrgård MA,Mannervik B




Has Abstract


2011-09-09 00:00:00














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    journal_title:Journal of molecular biology

    pub_type: 杂志文章


    authors: Johnson RS,Chester RE

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  • Molecular Basis of Class III Ligand Recognition by PDZ3 in Murine Protein Tyrosine Phosphatase PTPN13.

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    journal_title:Journal of molecular biology

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    authors: Kock G,Dicks M,Yip KT,Kohl B,Pütz S,Heumann R,Erdmann KS,Stoll R

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  • Identification and molecular analysis of oxyR-regulated promoters important for the bacterial adaptation to oxidative stress.

    abstract::The oxyR-encoded regulatory protein, OxyR, acts to induce the synthesis of a family of hydrogen peroxide-inducible proteins in Salmonella typhimurium and Escherichia coli. To further define the mechanism by which oxyR regulates the production of these proteins, we identified, mapped, and characterized oxyR-regulated p...

    journal_title:Journal of molecular biology

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    authors: Tartaglia LA,Storz G,Ames BN

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    authors: Ruminy P,Derambure C,Chandrasegaran S,Salier JP

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    journal_title:Journal of molecular biology

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    journal_title:Journal of molecular biology

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    journal_title:Journal of molecular biology

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    journal_title:Journal of molecular biology

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    authors: Nalini V,Bax B,Driessen H,Moss DS,Lindley PF,Slingsby C

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    authors: Kano A,Ohama T,Abe R,Osawa S

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    authors: Sygusch J,Beaudry D

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    authors: Wells C,Bagshaw CR

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    journal_title:Journal of molecular biology

    pub_type: 杂志文章


    authors: Kaplan JB,Dingwall A,Bryan R,Champer R,Shapiro L

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    journal_title:Journal of molecular biology

    pub_type: 杂志文章


    authors: Motz C,Martin H,Krimmer T,Rassow J

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    pub_type: 杂志文章


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