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Kribbella karoonensis sp. nov. and Kribbella swartbergensis sp. nov., isolated from soil from the Western Cape, South Africa

Department of Molecular and Cell Biology, University of Cape Town, Private Bag 1, Rondebosch, 7701, Cape Town, South Africa

Correspondence
Paul R. Meyers
pmeyers{at}science.uct.ac.za

Two novel nocardioform actinomycetes, strains Q41^T and HMC25^T, were isolated from soil samples collected in the Western Cape province, South Africa. Rapid genus identification revealed that the isolates belonged to the genus Kribbella (based on single-digestion restriction analysis of the 16S rRNA gene sequences with MboI, VspI, SphI, SnaBI, SalI and AgeI). Both isolates had LL-diaminopimelic acid and glycine in their cell-wall peptidoglycan, and contained mannose and ribose as whole-cell sugars. Strain HMC25^T is able to grow at 45 °C and in the presence of NaCl (3 %), cephaloridine (10 µg ml^–1) and gentamicin sulphate (10 µg ml^–1). Strain Q41^T grows in the presence of NaCl (2 %). Neither strain was able to grow under anaerobic conditions, whereas Kribbella flavida KACC 20248^T, Kribbella jejuensis HD9^T, Kribbella koreensis KACC 20250^T and Kribbella sandramycini KACC 20249^T exhibited weak but distinct growth under anaerobic conditions. Physiological test results and 16S rRNA gene sequence analysis allowed Q41^T and HMC25^T to be distinguished from other members of the genus with validly published names. Strains HMC25^T (=NRRL B-24426^T=DSM 17345^T) and Q41^T (=NRRL B-24425^T=DSM 17344^T) therefore represent the type strains of novel species, for which the names Kribbella swartbergensis sp. nov. and Kribbella karoonensis sp. nov., respectively, are proposed.

Scanning electron micrographs of mycelium of strains Q41^T and HMC25^T are available as supplementary material in IJSEM Online.

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