This work was financially supported by the Spanish Ministerio de Economía y Competitividad (Project No. CTQ2015-63567-R), the Principado de Asturias government (Project FC15-GRUPIN14-025) and co-financed by FEDER funds. We thank Dr. J.A. Boga from Service of Microbiology, Hospital Universitario Central de Asturias for assistance in bacteria culture and Dr. M. García-Ocaña for electrophoretic analysis of RNA. R. M.-C. thanks Principado de Asturias government and FICYT for a Clarín postdoctoral contract.