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Description of gamma radiation-resistant Geodermatophilus dictyosporus sp. nov. to accomodate the not validly named Geodermatophilus obscurus subsp. dictyosporus (Luedemann, 1968)

Lookup NU author(s): Dr Maria Del Carmen Montero-CalasanzORCiD, Professor Hans-Peter Klenk


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A gamma radiation-resistant, Gram reaction-positive, aerobic and chemoorganotrophic actinobacterium, initially designated Geodermatophilus obscurus subsp. dictyosporus G-5T, was not validly named at the time of initial publication (1968). G-5T formed black-colored colonies on GYM agar. The optimal growth range was 25–35 °C, at pH 6.5–9.5 and in the absence of NaCl. Chemotaxonomic and molecular characteristics of the isolate matched those described for members of the genus Geodermatophilus. The DNA G + C content of the strain was 75.3 mol %. The peptidoglycan contained meso-diaminopimelic acid as diagnostic diamino acid. The main polar lipids were phosphatidylcholine, diphosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine and one unspecified glycolipid; MK-9(H4) was the dominant menaquinone and galactose was detected as a diagnostic sugar. The major cellular fatty acids were branched-chain saturated acids, iso-C16:0 and iso-C15:0. The 16S rRNA gene showed 94.8–98.4 % sequence identity with the members of the genus Geodermatophilus. Based on phenotypic results and 16S rRNA gene sequence analysis, strain G-5T is proposed to represent a novel species, Geodermatophilus dictyosporus and the type strain is G-5T (=DSM 43161T = CCUG 62970T = MTCC 11558T = ATCC 25080T = CBS 234.69T = IFO 13317T = KCC A-0154T = NBRC 13317T). The INSDC accession number is HF970584.

Publication metadata

Author(s): Montero-Calasanz MDC, Hezbri K, Göker M, Sghaier H, Rohde M, Spröer C, Schumann P, Klenk HP

Publication type: Article

Publication status: Published

Journal: Extremophiles

Year: 2015

Volume: 19

Issue: 1

Pages: 77-85

Print publication date: 01/01/2015

Online publication date: 16/11/2014

Acceptance date: 28/10/2014

ISSN (print): 1431-0651

ISSN (electronic): 1433-4909

Publisher: Springer


DOI: 10.1007/s00792-014-0708-z


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