Geodermatophilus africanus sp. nov., a halotolerant actinomycete isolated from Saharan desert sand

Antonie Van Leeuwenhoek. 2013 Aug;104(2):207-16. doi: 10.1007/s10482-013-9939-8. Epub 2013 May 31.

Abstract

A novel Gram-strain positive, aerobic, actinobacterial strain, designated CF11/1(T), was isolated from a sand sample obtained in the Sahara Desert, Chad. The black-pigmented isolate was aerobic and exhibited optimal growth from 25 to 35 °C at pH 6.0-8.0 and with 0-8 % (w/v) NaCl, indicating that it is a halotolerant mesophile. Chemotaxonomic and molecular characteristics of the isolate matched those described for members of the genus Geodermatophilus. The G+C content in the genome was 74.4 mol%. The peptidoglycan contained meso-diaminopimelic acid as diagnostic diaminoacid. The main phospholipids were diphosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol and a minor fraction of phosphatidylglycerol; MK-9(H4) was the dominant menaquinone, and galactose was detected as a diagnostic sugar. The major cellular fatty acid was branched-chain saturated acid iso-C16:0. Analysis of 16S rRNA gene sequences showed 95.3-98.6 % pairwise sequence identity with the members of the genus Geodermatophilus. Based on phenotypic and chemotaxonomic properties, as well as phylogenetic distinctiveness, the isolate represents a novel species, Geodermatophilus africanus, with the type strain CF11/1(T) (DSM 45422 = CCUG 62969 = MTCC 11556).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actinomycetales / classification*
  • Actinomycetales / genetics
  • Actinomycetales / isolation & purification*
  • Bacterial Typing Techniques
  • Base Composition
  • Chad
  • DNA, Bacterial / genetics
  • Desert Climate
  • Fatty Acids / analysis
  • RNA, Ribosomal, 16S / genetics
  • Silicon Dioxide / analysis*
  • Soil Microbiology*

Substances

  • DNA, Bacterial
  • Fatty Acids
  • RNA, Ribosomal, 16S
  • Silicon Dioxide