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Catenulispora acidiphila gen. nov., sp. nov., a novel, mycelium-forming actinomycete, and proposal of Catenulisporaceae fam. nov.

Elena Busti¹, Linda Cavaletti¹, Paolo Monciardini¹, Peter Schumann², Manfred Rohde³, Margherita Sosio¹ and Stefano Donadio^1,

¹ Vicuron Pharmaceuticals, via Lepetit 34, 21040 Gerenzano, Italy
² DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany
³ GBF – Gesellschaft für Biotechnologische Forschung GmbH, D-38124 Braunschweig, Germany

Correspondence
Stefano Donadio
stefano_donadio{at}libero.it

A novel, Gram-positive bacterial strain was isolated from forest soil. Among species with validly published names, the 16S rRNA gene sequence is related most closely (approx. 93 % similarity) to that of Sporichthya polymorpha DSM 43042^T. However, differently from this species, it forms both vegetative and aerial mycelia. The aerial hyphae are straight to slightly flexuous, starting to septate to form chains of more than 20 cylindrical spores with a rugose surface. The strain is acidophilic, with a pH range for robust growth between 4.3 and 6.8 and an optimum around 6.0. The peptidoglycan type is A3 LL-Dpm–Gly. The polar lipids are phosphatidylglycerol, diphosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannosides and two unknown phospholipids. Predominant menaquinones are MK-9(H₆) and -9(H₄), and iso- and anteiso-branched C_{16 : 0} and C_{17 : 0} are the main cellular fatty acids. The DNA G+C content is 71.9 mol%. The distinct phylogenetic position and the unusual combination of chemotaxonomic characteristics justify the proposal of Catenulispora gen. nov., with the type species Catenulispora acidiphila sp. nov. (type strain, ID139908^T =DSM 44928^T=NRRL B-24433^T). Catenulisporaceae fam. nov. is also proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain ID139908^T is AJ865857.

Supplementary figures showing a FESEM image, polar lipid composition and phylogenetic position of strain ID139908^T are available in IJSEM Online.

Present address: KtedoGen, via Cav. Brusa 43, 21046 Malnate, Italy.

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