Reaction mechanisms of thiamin diphosphate enzymes: defining states of ionization and tautomerization of the cofactor at individual steps.

Reaction mechanisms of thiamin diphosphate enzymes: defining states of ionization and tautomerization of the cofactor at individual steps.
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DOI:
10.1111/j.1742-4658.2009.06964.x
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发表时间:
2009-05
期刊:
The FEBS journal
影响因子:
--
通讯作者:
Jordan F
Jordan F
中科院分区:
其他
文献类型:
--
作者:
Nemeria NS;Chakraborty S;Balakrishnan A;Jordan F

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We summarize the currently available information regarding the state of ionization and tautomerization of the 4′-aminopyrimidine ring of the thiamine diphosphate on enzymes requiring this coenzyme. This coenzyme forms a series of covalent intermediates with its substrates as an electrophilic catalyst, and the coenzyme itself also carries out intramolecular proton transfers, which is virtually unprecedented in coenzyme chemistry. An understanding of the state of ionization and tautomerization of the 4′-aminopyrimidine ring in each of these intermediates provides important details about proton movements during catalysis. CD spectroscopy, both steady-state and time-resolved, has proved crucial for obtaining this information because no other experimental method has provided such atomic detail so far.
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