TAILIEUCHUNG - Báo cáo khoa học: The alr2505 (osiS) gene from Anabaena sp. strain PCC7120 encodes a cysteine desulfurase induced by oxidative stress

NifS-like cysteine desulfurases are widespread enzymes involved in the mobi-lization of sulfur from cysteine. The genome of the filamentous diazotrophic cyanobacterium AnabaenaPCC 7120 contains four open reading frames potentially encoding NifS-like proteins. One of them, alr2505, belongs to the pkn22operon, which enablesAnabaenato cope with oxidative stress. | ỊFEBS Journal The alr2505 osiS gene from Anabaena sp. strain PCC7120 encodes a cysteine desulfurase induced by oxidative stress Marion Ruiz Azzeddine Bettache Annick Janicki Daniel Vinella Cheng-Cai Zhang and Amel Latifi Aix-Marseille Université and Laboratoire de Chimie Bacterienne IBSM-CNRS Marseille France Keywords Anabaena cysteine desulfurase Fe-S clusters oxidative stress sulfur transfer Correspondence A. Latifi. Laboratoire de Chimie Bacterienne IBSM-CNRS 31 Chemin Joseph Aiguier 13402 Marseille Cedex 20 France Fax 33 4 91 71 89 14 Tel 33 4 91 16 41 88 E-mail latifi@ Received 22 May 2010 revised 27 June 2010 accepted 12 July 2010 doi NifS-like cysteine desulfurases are widespread enzymes involved in the mobilization of sulfur from cysteine. The genome of the filamentous diazotrophic cyanobacterium Anabaena PCC 7120 contains four open reading frames potentially encoding NifS-like proteins. One of them alr2505 belongs to the pkn22 operon which enables Anabaena to cope with oxidative stress. The Alr2505 protein was purified and found to share all the features characteristic of cysteine desufurases. This is the first NifS-like enzyme to be functionally characterized in this bacterium. On the basis of the transcriptional profiling of all nfS-like genes in Anabaena it is concluded that alr2505 is the only cysteine desulfurase-encoding gene induced by oxidative stress. The function of Alr2505 which was termed OsiS is discussed. Structured digital abstract MINT-7966515 osis uniprotkb Q8YU51 and osiS uniprotkb Q8YU51 physically interact MI 0915 by two hybrid MI 0018 Introduction Sulfur is present in a wide range of biomolecules with various chemical features including enzymes catalyzing many important chemical reactions. During the last decade considerable progress has been made towards understanding sulfur-trafficking processes in various organisms with particular attention being paid to the enzymes that catalyze the

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