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Modestobacter caceresii sp nov., novel actinobacteria with an insight into their adaptive mechanisms for survival in extreme hyper-arid Atacama Desert soils

Lookup NU author(s): Kanungrid Busarakam, Professor Alan Bull, Professor Michael Goodfellow


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A polyphasic study was designed to determine the taxonomic provenance of three Modestobacter strains isolated from an extreme hyper-arid Atacama Desert soil. The strains, isolates KNN 45-1a, KNN 45-2b(T) and KNN 45-3b, were shown to have chemotaxonomic and morphological properties in line with their classification in the genus Modestobacter. The isolates had identical 16S rRNA gene sequences and formed a branch in the Modestobacter gene tree that was most closely related to the type strain of Modestobacter marinus (99.6% similarity). All three isolates were distinguished readily from Modestobacter type strains by a broad range of phenotypic properties, by qualitative and quantitative differences in fatty acid profiles and by BOX fingerprint patterns. The whole genome sequence of isolate KNN 45-2b(T) showed 89.3% average nucleotide identity, 90.1% (SD: 10.97%) average amino acid identity and a digital DNA-DNA hybridization value of 42.4 +/- 3.1 against the genome sequence of M. marinus DSM 45201(T), values consistent with its assignment to a separate species. On the basis of all of these data, it is proposed that the isolates be assigned to the genus Modestobacter as Modestobacter caceresii sp. nov. with isolate KNN 45-2b(T) (CECT 9023(T) = DSM 101691(T)) as the type strain. Analysis of the whole-genome sequence of M. caceresii KNN 45-2b(T), with 4683 open reading frames and a genome size of similar to 4.96 Mb, revealed the presence of genes and gene-clusters that encode for properties relevant to its adaptability to harsh environmental conditions prevalent in extreme hyper arid Atacama Desert soils. (C) 2016 Published by Elsevier GmbH.

Publication metadata

Author(s): Busarakam K, Bull AT, Trujillo ME, Riesco R, Sangal V, van Wezel GP, Goodfellow M

Publication type: Article

Publication status: Published

Journal: Systematic and Applied Microbiology

Year: 2016

Volume: 39

Issue: 4

Pages: 243-251

Print publication date: 01/06/2016

Online publication date: 24/03/2016

Acceptance date: 18/03/2016

ISSN (print): 0723-2020

ISSN (electronic): 1618-0984

Publisher: Elsevier GmbH - Urban und Fischer


DOI: 10.1016/j.syapm.2016.03.007


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Funder referenceFunder name
Leverhulme Trust
Royal Thai Government
18KAZG/463AC01Universidad de Salamanca
JP 100654Royal Society