Isotope Substitution of Promiscuous Alcohol Dehydrogenase Reveals the Origin of Substrate Preference in the Transition State
Isotope Substitution of Promiscuous Alcohol Dehydrogenase Reveals the Origin of Substrate Preference in the Transition State
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混杂醇脱氢酶的同位素取代揭示了过渡态底物偏好的起源
DOI:
10.1002/ange.201712826
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发表时间:
2018
影响因子:
--
通讯作者:
Behiry E
中科院分区:
文献类型:
--
作者:
Behiry E
The origin of substrate preference in promiscuous enzymes was investigated by enzyme isotope labelling of the alcohol dehydrogenase fromGeobacillus stearothermophilus(BsADH). At physiological temperature, protein dynamic coupling to the reaction coordinate was insignificant. However, the extent of dynamic coupling was highly substrate‐dependent at lower temperatures. For benzyl alcohol, an enzyme isotope effect larger than unity was observed, whereas the enzyme isotope effect was close to unity for isopropanol. Frequency motion analysis on the transition states revealed that residues surrounding the active site undergo substantial displacement during catalysis for sterically bulky alcohols. BsADH prefers smaller substrates, which cause less protein friction along the reaction coordinate and reduced frequencies of dynamic recrossing. This hypothesis allows a prediction of the trend of enzyme isotope effects for a wide variety of substrates.
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DOI:
10.1107/s1744309113015170
发表时间:
2013-07-01
影响因子:
0.9
作者:
Thomas, Leonard M.;Harper, Angelica R.;Sims, Paul A.
通讯作者:
Sims, Paul A.
影响因子:
15
作者:
Zoi I;Suarez J;Antoniou D;Cameron SA;Schramm VL;Schwartz SD
通讯作者:
Schwartz SD
DOI:
10.1021/jp400376h
发表时间:
2013-08-15
期刊:
The journal of physical chemistry. A
影响因子:
--
作者:
Masterson JE;Schwartz SD
通讯作者:
Schwartz SD
影响因子:
7.8
作者:
K. Świderek;K. Świderek;J. Ruiz;V. Moliner;I. Tuñón
通讯作者:
I. Tuñón