The Deinococcus radiodurans SMC protein is dispensable for cell viability yet plays a role in DNA folding. - Archive ouverte HAL
Article Dans Une Revue Extremophiles Année : 2009

The Deinococcus radiodurans SMC protein is dispensable for cell viability yet plays a role in DNA folding.

Résumé

Deinococcus radiodurans contains a highly condensed nucleoid that remains to be unaltered following the exposure to high doses of gamma-irradiation. Proteins belonging to the structural maintenance of chromosome protein (SMC) family are present in all organisms and were shown to be involved in chromosome condensation, pairing, and/or segregation. Here, we have inactivated the smc gene in the radioresistant bacterium D. radiodurans, and, unexpectedly, found that smc null mutants showed no discernible phenotype except an increased sensitivity to gyrase inhibitors suggesting a role of SMC in DNA folding. A defect in the SMC-like SbcC protein exacerbated the sensitivity to gyrase inhibitors of cells devoid of SMC. We also showed that the D. radiodurans SMC protein forms discrete foci at the periphery of the nucleoid suggesting that SMC could locally condense DNA. The phenotype of smc null mutant leads us to speculate that other, not yet identified, proteins drive the compact organization of the D. radiodurans nucleoid.

Dates et versions

hal-00527433 , version 1 (19-10-2010)

Identifiants

Citer

Claire Bouthier de La Tour, Magali Toueille, Edmond Jolivet, Hong-Ha Nguyen, Pascale Servant, et al.. The Deinococcus radiodurans SMC protein is dispensable for cell viability yet plays a role in DNA folding.. Extremophiles, 2009, 13 (5), pp.827-37. ⟨10.1007/s00792-009-0270-2⟩. ⟨hal-00527433⟩
141 Consultations
0 Téléchargements

Altmetric

Partager

More