Original Paper

Extremophiles

, Volume 10, Issue 3, pp 181-189

Diversity of actinomycetes isolated from Challenger Deep sediment (10,898 m) from the Mariana Trench

  • Wasu Pathom-areeAffiliated withDivision of Biology, Faculty of Science, Agriculture and Engineering, University of NewcastleDepartment of Biology, Faculty of Science, Chiang Mai University Email author 
  • , James E. M. StachAffiliated withDivision of Biology, Faculty of Science, Agriculture and Engineering, University of Newcastle
  • , Alan C. WardAffiliated withDivision of Biology, Faculty of Science, Agriculture and Engineering, University of Newcastle
  • , Koki HorikoshiAffiliated withThe DEEPSTAR Group, Japan Marine Science and Technology Center (JAMSTEC)
  • , Alan T. BullAffiliated withResearch School of Biosciences, University of Kent
  • , Michael GoodfellowAffiliated withDivision of Biology, Faculty of Science, Agriculture and Engineering, University of Newcastle

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Thirty-eight actinomycetes were isolated from sediment collected from the Mariana Trench (10,898 m) using marine agar and media selective for actinomycetes, notably raffinose-histidine agar. The isolates were assigned to the class Actinobacteria using primers specific for members of this taxon. The phylogenetic analysis based on 16S rRNA gene sequencing showed that the isolates belonged to the genera Dermacoccus, Kocuria, Micromonospora, Streptomyces, Tsukamurella and Williamsia. All of the isolates were screened for genes encoding nonribosomal peptide and polyketide synthetases. Nonribosomal peptide synthetase sequences were detected in more than half of the isolates and polyketide synthases type I (PKS-I) were identified in five out of 38 strains. The Streptomyces isolates produced several unusual secondary metabolites, including a PKS-I associated product. In initial testing for piezotolerance, the Dermacoccus strain MT1.1 grew at elevated hydrostatic pressures.

Keywords

Mariana trench Actinomycetes Deep-sea 16S rRNA genes Phylogenetic analysis NRPS PKS I PKS II Dermacoccus