The Transcription Factor CarH Safeguards Use of Adenosylcobalamin as a Light Sensor by Altering the Photolysis Products.

The Transcription Factor CarH Safeguards Use of Adenosylcobalamin as a Light Sensor by Altering the Photolysis Products.
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DOI:
10.1021/acs.biochem.5b00416
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发表时间:
2015-06-02
期刊:
影响因子:
2.9
通讯作者:
Drennan, Catherine L.
Drennan, Catherine L.
中科院分区:
生物学3区
文献类型:
--
作者:
Jost, Marco;Simpson, Jeffrey H.;Drennan, Catherine L.

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新发现的光依赖性转录因子CarH使用腺苷钴胺素作为光传感器来调节暴露在阳光下细菌中保护基因的表达。这种对腺苷钴胺素的使用是对经典酶辅助因子的巧妙改编,利用了其光稳定性的Co-C键。然而,令人困惑的是,腺苷钴胺素的光解会产生可能破坏DNA的5 ' -脱氧腺苷基。在这里,我们使用液相色谱和光谱技术,证明了CarH抑制5 ' -脱氧腺苷自由基的释放,相反,影响转化为非活性的4 ',5 ' -无氢腺苷。通过这种方式,CarH在光依赖性基因调控中保障了腺苷钴胺素的使用。
The newly discovered light-dependent transcription factor CarH uses adenosylcobalamin as a light sensor to regulate expression of protective genes in bacteria upon exposure to sunlight. This use of adenosylcobalamin is a clever adaptation of a classic enzyme cofactor, taking advantage of its photolabile Co–C bond. However, it is also puzzling in that photolysis of adenosylcobalamin generates the 5′-deoxyadenosyl radical that could damage DNA. Here, using liquid chromatography and spectroscopic techniques, we demonstrate that CarH suppresses release of the 5′-deoxyadenosyl radical and instead effects conversion to a nonreactive 4′,5′-anhydroadenosine. In this manner, CarH safeguards use of adenosylcobalamin in light-dependent gene regulation.
DOI: 10.1073/pnas.1018972108
发表时间: 2011-05-03
影响因子: 11.1
作者:
Manuel Ortiz-Guerrero, Juan;Carmen Polanco, Maria;Elias-Arnanz, Montserrat
通讯作者: Elias-Arnanz, Montserrat
DOI: 10.1021/ja051527k
发表时间: 2005-06-22
影响因子: 15
作者:
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通讯作者: Radom, L