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Interestingly, while the hydride transfer was much faster, the DAD distribution was not affected (retaining temperature-independent KIEint).
This last finding emphasized the evolutionary pressure on the DAD distribution, despite the fact that the bond activation is far from being rate-limiting.
Fast relaxation of the TS-mimic suggests a vibrationally rigid TS, which accords well with the temperature-independent KIEint that indicates a narrow DAD distribution, which means fast femtosecond to picosecond fluctuations of the DAD at the TRS.
To explore the relations between the DAD distribution and the temperature dependence of intrinsic KIEs (KIEint), a series of active-site mutants was constructed focusing on Ile14, which holds the H-donor close to the H-acceptor.
Interestingly, the temperature-dependence of KIEint for these two steps revealed that step 6 (Scheme 3) requires a well-defined and narrowly distributed ensemble of DADs, while step 4 has a longer and much broader DAD distribution.
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This elucidation of relations between the temperature-dependence of KIEint and DAD distributions allows the examination of the role of enzyme dynamics across the protein on bond activation.
The findings most relevant to this Account include (i) the different DAD distributions and dynamics associated with the two C H bonds activated (steps 4 and 6 in Scheme 2), (ii) the global effect of mutation on the protein functional dynamics, and (iii) the rigidifying effect of Mg2+ binding on activity.
The dad was with distribution with Universal.
Examination of the H-transfer rates, the temperature dependence of KIEint, and MD calculations revealed that lengthening the average DAD and broadening its distribution leads to a gradual increase in the temperature dependence of KIEsint.
The release pattern was innovative (although movies such as Steven Sheil's low-budget horror Mum & Dad had previously explored simultaneous distribution) and ensured that the widest possible audience was brought to what may otherwise have been a niche-market movie.
Dad didn't want the partnership to make distributions; he wanted the wealth saved for the grandchildren.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com