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Role of oxyR from Sinorhizobium meliloti in Regulating the Expression of Catalases

Acta biochimica et biophysica Sinica 2005年第6期37卷 421-428页

作者： li euo~(1.3) ming-sheng qi~(1.3) shi-yi yao~2 hai-ping cheng~2 jia-bi zhu~1 guan-qiao yu~1 1 national laboratory of plant molecular genetics, institute of plant physiology and ecology, shanghai institutes for biological sciences.chinese academy of sciences, shanghai 200032. china 2 biological sciences Department, Lehman College, the City University of New York, Bronx, NY 10468. USA, 3 Graduate School of the chinese academy of sciences, shanghai 200032. china nationallaboratoryofplantmoleculargenetics InstituteofPlantPhysiologyandEcologyShanghaiInstitutesforBiologi

The process of symbiotic nitrogen fixation results in the generation of reactive oxygen speciessuch as the superoxide anion（O2-）and hydrogen peroxide（H2O2）.The response of rhizobia to these toxicoxygen species is an important factor in nodulation and nitrogen *** Sinorhizobium meliloti,oneoxyR homologue and three catalase genes,katA,katB,and katC were detected by sequence *** gene is located next to and divergently from katA on the *** investigate the possible rolesof oxyR in regulating the expression of catalases at the transcriptional level in ***,an insertion mutantof this gene was *** mutant was more sensitive and less adaptive to H2O2than the wild typestrain,and total catalase/peroxidase activity was reduced approximately fourfold with the OxyR mutationrelative to *** activities of KatA and KatB and the expression of katA::lacZ and katB::lacZ promoterfusions were increased in the mutant strain compared with the parental strain grown in the absence of H2O2,indicating that katA and katB are repressed by ***,when exposed to H2O2,katA expressionwas also increased in both *** and Escherichia *** exposed to H2O2,OxyR is convertedfrom a reduced to an oxidized form in *** concluded that the reduced form of OxyR functions as arepressor of katA and katB ***,in the presence of H2O2,reduced OxyR is converted to theoxidized form of OxyR that then results in increased katA *** further showed that oxyR expressionis autoregulated via negative feedback.

关键词： Sinorhizobium meliloti OxyR catalase katA H2O2

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