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- Pukyongia salina gen. nov., sp. nov., a novel genus in the family Flavobacteriaceae
- Young-Sam Kim , Seong-Jin Kim , Yeon Hee Jang , Kyoung-Ho Kim
- J. Microbiol. 2020;58(6):456-462. Published online April 22, 2020
- DOI: https://doi.org/10.1007/s12275-020-9310-5
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- 5 Web of Science
- 5 Crossref
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Abstract
- A Gram-negative aerobic bacterium, designated RR4-38T, was isolated from a biofilter in a seawater recirculating aquaculture system (RAS) in Busan, South Korea. The bacteria were irregular, short, rod-shaped, non-motile, oxidase-positive, and catalase-negative. Growth of the strain RR4-38T was observed at 15–35°C (optimum, 25–30°C), pH 5.5–9.5 (optimum, pH 8.0), and in the presence of 0–5% (w/v) NaCl (optimum, 3%). Phylogenetic analysis based on the 16S rRNA gene sequences showed that the strain RR4-38T formed a distinct lineage with close genera Ulvibacter (≤ 95.01% 16S rRNA gene sequence similarity), Aureitalea (94.74%), Aureisphaera (≤ 93.27%), and Jejudonia (93.07%) that all belong to the family Flavobacteriaceae. Whole-genome sequence comparison revealed that the ANI (average nucleotide identity) and digital DDH (DNA-DNA hybridization) values between strain RR4-38T and the two closest strains, Ulvibacter antarcticus DSM 23424T and Aureitalea marina S1-66T, were 68.96– 69.88% and 17.4–19%, respectively. The genome analysis revealed that the strain might be involved in biodegradation of organic debris produced by farmed fish in aquaculture systems. The predominant respiratory quinone was menaquinone MK-6 and the major cellular fatty acids were iso- C15:0 (26.5%), iso-C17:0 3-OH (16.4%), iso-C15:1 G (15%), and iso-C16:0 3-OH (9.6%). The major cellular polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, unidentified aminolipids, and glycolipids. Based on phenotypic, chemotaxonomic, and phylogenetic features, strain RR4-38T represents a novel genus and species in the family Flavobacteriaceae, for which the name Pukyongia salina gen. nov., sp. nov. is proposed. The type strain is RR4-38T (= KCTC 52651T = DSM 108068T).
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Review
- [Minireview] Antibiotic resistance of pathogenic Acinetobacter species and emerging combination therapy
- Bora Shin , Woojun Park
- J. Microbiol. 2017;55(11):837-849. Published online October 27, 2017
- DOI: https://doi.org/10.1007/s12275-017-7288-4
- 56 View
- 0 Download
- 38 Crossref
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Abstract
- The increasing antibiotic resistance of Acinetobacter species in both natural and hospital environments has become a serious problem worldwide in recent decades. Because of both intrinsic and acquired antimicrobial resistance (AMR) against last-resort antibiotics such as carbapenems, novel therapeutics are urgently required to treat Acinetobacter-associated infectious diseases. Among the many pathogenic Acinetobacter species, A. baumannii has been reported to be resistant to all classes of antibiotics and contains many AMR genes, such as blaADC (Acinetobacter-derived cephalosporinase). The AMR of pathogenic Acinetobacter species is the result of several different mechanisms, including active efflux pumps, mutations in antibiotic targets, antibiotic modification, and low antibiotic membrane permeability. To overcome the limitations of existing drugs, combination theraphy that can increase the activity of antibiotics should be considered in the treatment of Acinetobacter infections. Understanding the molecular mechanisms behind Acinetobacter AMR resistance will provide vital information for drug development and therapeutic strategies using combination treatment. Here, we summarize the classic mechanisms of Acinetobacter AMR, along with newly-discovered genetic AMR factors and currently available antimicrobial adjuvants that can enhance drug efficacy in the treatment of A. baumannii infections.
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