Substrate ambiguous enzymes within the Escherichia coli proteome offer different evolutionary solutions to the same problem.
Substrate ambiguous enzymes within the Escherichia coli proteome offer different evolutionary solutions to the same problem.
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大肠杆菌蛋白质组中的底物模糊酶为同一问题提供了不同的进化解决方案。
DOI:
10.1093/molbev/mst105
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发表时间:
2013
影响因子:
10.7
通讯作者:
Matsumura,Ichiro
中科院分区:
文献类型:
--
作者:
Yip,SylviaHsu-Chen;Matsumura,Ichiro
Many enzymes exhibit some catalytic promiscuity or substrate ambiguity. These weak activities do not affect the fitness of the organism under ordinary circumstances, but can serve as potential evolutionary precursors of new catalytic functions. We wondered whether different proteins with the same substrate ambiguous activity evolve differently under identical selection conditions. Patrick et al. (Patrick WM, Quandt EM, Swartzlander DB, Matsumura I. 2007. Multicopy suppression underpins metabolic evolvability.Mol Biol Evol.24:2716–2722.) previously showed that three multicopy suppressors,gph,hisB,andytjC, rescue ΔserB Escherichia colicells from starvation on minimal media. We directed the evolution of variants of Gph, histidinol phosphatase (HisB), and YtjC that complemented ΔserBmore efficiently, and characterized the effects of the amino acid changes, alone and in combination, upon the evolved phosphoserine phosphatase (PSP) activity. Gph and HisB are members of the HAD superfamily of hydrolases, but they adapted through different, kinetically distinguishable, biochemical mechanisms. All of the selected mutations, except N102T in YtjC, proved to be beneficial in isolation. They exhibited a pattern of antagonistic epistasis, as their effects in combination upon the kinetic parameters of the three proteins in reactions with phosphoserine were nonmultiplicative. The N102T mutation exhibited sign epistasis, as it was deleterious in isolation but beneficial in the context of other mutations. We also showed that the D57N mutation in the chromosomal copy ofhisBis sufficient to suppress the ΔserBdeletion. These results in combination show that proteomes can offer multiple mechanistic solutions to a molecular recognition problem.
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影响因子:
2.9
作者:
Johnsen, Ulrike;Schoenheit, Peter
通讯作者:
Schoenheit, Peter
影响因子:
5.6
作者:
E. Morett;G. Saab;L. Olvera;Maricela Olvera;H. Flores;R. Grande
通讯作者:
R. Grande
DOI:
--
发表时间:
2008
期刊:
--
影响因子:
--
作者:
M. Niemi;J. Jänis;S. Jylha;J. Kallio;N. Hakulinen;M. Laukkanen;K. Takkinen;J. Rouvinen
通讯作者:
M. Niemi;J. Jänis;S. Jylha;J. Kallio;N. Hakulinen;M. Laukkanen;K. Takkinen;J. Rouvinen
DOI:
10.1016/0006-3002(56)90305-5
发表时间:
1956
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
V. Rodwell;Jack C. Towne;Santiago Grisolia
通讯作者:
Santiago Grisolia
影响因子:
3.5
作者:
INOUE, H;NOJIMA, H;OKAYAMA, H
通讯作者:
OKAYAMA, H