Abstract:
:NorA, NorB, and NorC are efflux proteins in the Nor family that regulate the secretion of fluoroquinolones, and MgrA/NorR is a transcription factor of the Nor family. Overexpression of Nor family proteins provides fluoroquinolone resistance in Staphylococcus aureus. However, in coagulase-negative staphylococci (CNS), members of the Nor family had not been identified. In this work, the presence of Nor family proteins in Staphylococcus spp. and the expression of Nor family in gatifloxacin resistant S. epidermidis strains obtained from ocular infections (OI) were identified and analyzed. S. epidermidis strains from OIs (n = 44) and healthy skin (HS; n = 52) were isolated. The nor family genes were identified in CNS using PCR, sequencing and phylogenetic approaches. Nor family expression was determined by RT-PCR. NorA efflux activity was determined using the automated ethidium bromide method. In-silico analysis showed that norA, mgrA/norR, and "norB-like" and "norC-like" (norB/norC) genes are present in CNS. The nor family genes were distributed and constitutively expressed in all S. epidermidis strains studied. In one gatifloxacin resistant strain isolated from the endophthalmitis, treatment with gatifloxacin induced overexpression of the norA gene and resulted in high activity of NorA efflux. These results indicate that the Nor family of proteins is present in CNS, and the NorA efflux mechanism for gatifloxacin response occurs in at least one strain of S. epidermidis, contributing to gatifloxacin resistance.
journal_name
Microb Pathogjournal_title
Microbial pathogenesisauthors
Juárez-Verdayes MA,Parra-Ortega B,Hernández-Rodríguez C,Betanzos-Cabrera G,Rodríguez-Martínez S,Cancino-Diaz ME,Cancino-Diaz JCdoi
10.1016/j.micpath.2012.03.001subject
Has Abstractpub_date
2012-06-01 00:00:00pages
318-25issue
6eissn
0882-4010issn
1096-1208pii
S0882-4010(12)00037-Xjournal_volume
52pub_type
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