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.
复制标题
DOI:
10.1021/acs.biochem.5b00416
复制
发表时间:
2015-06-02
期刊:
影响因子:
2.9
通讯作者:
Drennan, Catherine L.
中科院分区:
文献类型:
--
作者:
Jost, Marco;Simpson, Jeffrey H.;Drennan, Catherine L.
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.
登录
查看更多内容
影响因子:
15
作者:
GRATE, JH;SCHRAUZER, GN
通讯作者:
SCHRAUZER, GN
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
影响因子:
15
作者:
Sandala, GM;Smith, DM;Radom, L
通讯作者:
Radom, L
影响因子:
15
作者:
KIM, SH;CHEN, HL;HALPERN, J
通讯作者:
HALPERN, J
影响因子:
15
作者:
GARR, CD;FINKE, RG
通讯作者:
FINKE, RG