Browse by author
Lookup NU author(s): Ali Kusuma, Dr Imen Nouioui, Emeritus Professor Michael Goodfellow
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The Authors.A polyphasic study was designed to determine the taxonomic status of isolate CSLK01-03T, which was recovered from an Indonesian neutral hot spring and provisionally assigned to the genus Rhodococcus. The isolate was found to have chemo-taxonomic, cultural and morphological properties typical of rhodococci. It has a rod–coccus lifecycle and grows from 10 to 39 °C, from pH 6.5 to 8.0 and in the presence of 0–10% (w/v) sodium chloride. Whole-organism hydrolysates contain meso-diaminopimelic acid, arabinose and galactose, the predominant menaquinone is MK-8 (H2), the polar lipid pattern consists of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol mannosides, phosphatidylmethylethanolamine and two unidentified components, it produces mycolic acids, and C16:0 is the major fatty acid. Whole-genome analyses show that the isolate and Rhodococcus electrodiphilus LMG 29881T (GenBank accession: JAULCK000000000) have genome sizes of 5.5 and 5.1 Mbp, respectively. These strains and Rhodococcus aetherivorans DSM 44752T and Rhodococcus ruber DSM 43338T form well-supported lineages in 16S rRNA and whole-genome trees that are close to sister lineages composed of the type strains of Rhodococcus rhodochrous and related Rhodococcus species. The isolate can be distinguished from its closest evolutionary neighbours using combinations of cultural and phenotypic features, and by low DNA–DNA hybridization values. Based on these data it is proposed that isolate CSLK01-03T (=CCMM B1310T=ICEBB-06T=NCIMB 15214T) be classified in the genus Rhodococcus as Rhodococcus indonesiensis sp. nov. The genomes of the isolate and its closest phylogenomic relatives are rich in biosynthetic gene clusters with the potential to synthesize new natural products, notably antibiotics. In addition, whole-genome-based taxonomy revealed that Rhodococ-cus electrodiphilus LMG 29881T and Rhodococcus ruber DSM 43338T belong to a single species. It is, therefore, proposed that R. electrodiphilus be recognized as a heterotypic synonym of R. ruber.
Author(s): Kusuma AB, Fenylestari G, Ammar F, Nououi I, Goodfellow M
Publication type: Article
Publication status: Published
Journal: International Journal of Systematic and Evolutionary Microbiology
Year: 2024
Volume: 74
Issue: 1
Online publication date: 12/01/2024
Acceptance date: 26/12/2023
Date deposited: 24/01/2024
ISSN (print): 1466-5026
ISSN (electronic): 1466-5034
Publisher: Microbiology Society
URL: https://doi.org/10.1099/ijsem.0.006236
DOI: 10.1099/ijsem.0.006236
PubMed id: 38214280
Altmetrics provided by Altmetric
