Identification of Staphylococcus argenteus in Eastern China based on a nonribosomal peptide synthetase (NRPS) gene

Aim: To investigate whether the Staphylococcus argenteus is present in Eastern China and to verify the utility of a new screening process. Materials & methods: Phenotype observation, PCR assay targeting a hypothetical nonribosomal peptide synthetase ( NRPS) gene, phylogenetic analysis of rpoB and multilocus sequence typing were used to screen and identify strains of S. argenteus from 839 presumptive S. aureus isolates. Results: Eighty-nine ( 89/839, 10.6%) of the presumptive S. aureus isolates produced white colonies on tryptone soya agar plates. Of the white-colony isolates, six ( 6/89, 7%) were S. argenteus, 75 ( 75/89, 84%) were S. aureus and eight ( 8/89, 9%) were other bacteria. Conclusion: The PCR-based method targeting the NRPS gene can simultaneously identify and distinguish S. argenteus and S. aureus. All representative sequences of rpoB generated in this study were deposited in GenBank under accession numbers SJTU F20002, KT767581; SJTU F20269, KT767582; SJTU F20419, KT767583; SJTU F20420, KT767584; SJTU F20124, KT767585; SJTU F21164, KT767586; SJTU F21285, KT767587; SJTU F21224, KT767588; SJTU F21155, KT767589; SJTU F21294, KT767590; SJTU F20030, KT767591; SJTU F20044, KT767592; SJTU F20135, KT767593; SJTU F20123, KT767594; SJTU F21319, KT767595, respectively. All the new sequence types ( STs) were submitted to a multilocus sequence typing database and the assigned ST numbers are ST3261 ( 151-469-20-101-145-150-131), ST3262 ( 12-3-1-1-4-4-410) and ST3267 ( 2-471-2-2-6-3-2).