Vitamin B(12) in the spotlight again.

Vitamin B(12) in the spotlight again.
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DOI:
10.1016/j.cbpa.2017.01.013
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发表时间:
2017-04
影响因子:
7.8
通讯作者:
Drennan CL
Drennan CL
中科院分区:
生物学2区
文献类型:
--
作者:
Bridwell-Rabb J;Drennan CL

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The ability of cobalamin to coordinate different upper axial ligands gives rise to a diversity of reactivity. Traditionally, adenosylcobalamin is associated with radical-based rearrangements, and methylcobalamin with methyl cation transfers. Recently, however, a new role for adenosylcobalamin has been discovered as a light sensor, and a methylcobalamin-dependent enzyme has been identified that is suggested to transfer a methyl anion. Additionally, recent studies have provided a wealth of new information about a third class of cobalamin-dependent enzymes that do not appear to use an upper ligand. They function in reductive dehalogenations and epoxide reduction reactions. Finally, mechanistic details are beginning to emerge about the cobalamin-dependent S-adenosylmethionine radical enzyme superfamily for which the role of cobalamin has been largely enigmatic.
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