Actinoplanes rishiriensis sp. nov., a novel motile actinomycete isolated by rehydration and centrifugation method

Phylogenomic analyses of the genus Actinoplanes: description of four novel genera

The genus Actinoplanes comprises 57 species (in February 2024) that are important components of ecosystems and are widely used in biotechnology, especially pharmaceuticals. Phylogenetic analysis of the family Micromonosporaceae (based on the 16S rRNA gene sequence) allowed us to group members of different genera into separate clades; however, the genus Actinoplanes was divided into three separate clades. Such phylogenetic heterogeneity could be due to the limitations of 16S rRNA gene analysis. In response to this heterogeneity, genomic phylogeny was performed. Phylogenomic reconstruction based on 324 single-copy orthologous genes allowed us to divide the genus Actinoplanes first into four clades and then, based on average nucleotide identity analysis, into five clades. Finally, chemotaxonomic analysis of each clade confirmed each clade's distinctiveness and the necessity to reclassify the genus Actinoplanes. The obtained data allowed us to divide the genus Actinoplanes into five genera: Actinoplanes, Paractinoplanes, Winogradskya, Symbioplanes and Amorphoplanes.

Three novel Actinoplanes species isolated by using polyaspartic acid as a water-retaining agent for the enrichment in situ

Three novel actinomycete strains, designated TRM66264-DLM^T, TRM88002^T and TRM88003^T, were isolated by using polyaspartic acid as a water-retaining agent for the enrichment in situ. The 16S rRNA gene sequence and phylogenetic analyses of three strains indicated that they belonged to the genus Actinoplanes. The phylogenetically closest strains of TRM66264-DLM^T, TRM88002^T and TRM88003^T were Actinoplanes bogorensis LIPI11-2-Ac043^T (98.4 %), Actinoplanes abujensis A4029^T (98.0 %) and Actinoplanes ferrugineus IFO15555^T (98.1 %), respectively. The major polar lipids of strains TRM66264-DLM^T and TRM88002^T were phosphatidylethanolamine and disphosphatidylglycerol, while strain TRM88003^T only had phosphatidylethanolamine. The predominant menaquinones of strain TRM66264-DLM^T were identified as MK-9(H₄) and MK-9 (H₆). Strains TRM88002^T and TRM88003^T had MK-9(H₄). The cell-wall peptidoglycan of three strains contained meso-diaminopimelic acid. The whole-cell sugars of strain TRM66264-DLM^T were identified as arabinose, glucose, galactose and xylose. Strains TRM88002^T and TRM88003^T mainly had arabinose and glucose. The DNA G+C content of strains TRM66264-DLM^T, TRM88002^T and TRM88003^T were 70.48, 70.46 and 70.64 mol%, respectively. Genotypic and phenotypic analysis confirmed that all three strains sre new members of the genus Acinoplanes. Therefore, it is proposed that strains TRM66264-DLM^T, TRM88002^T and TRM88003^T represent three novel species of the genus Actinoplanes, for which the names Actinoplanes polyasparticus sp. nov. (type strain TRM66264-DLM^T=CCTCC AA 2021015^T=LMG 32389^T), Actinoplanes hotanensis sp. nov. (type strain TRM88002^T=CCTCC AA 2021036^T=LMG 32621^T) and Actinoplanes aksuensis sp. nov. (type strain TRM88003^T=CCTCC AA 2021037 ^T=LMG 32622^T) are proposed.

Actinoplanes solisilvae sp. nov., Isolated from Birch Forest Soil

A novel actinomycete, designated strain LAM7112^T, was isolated from soil sample collected from a birch forest in Xinjiang Uygur Autonomous Region, China. The new isolate was found to be able to grow at 20-45 °C (optimum: 35 °C), pH 5.0-10.0 (optimum: 7.0) and in the presence of 0-10.0% (optimum: 3.0%) (w/v) NaCl. The isolate formed very scantily irregular sporangia containing motile spores on the substrate mycelium. Phylogenetic analysis of 16S rRNA gene sequences indicated that the new isolate was closely related to members of the family Micromonosporaceae, with highest similarites to Actinoplanes ferrugineus X-14695^T (97.4%), Micromonospora zamorensis DSM 45600^T (97.3%) and Micromonospora aurantiaca ATCC 27029^T (97.3%). In the phylogenetic trees, strain LAM7112^T formed a stable phylogenetic subclade within the genus Actinoplanes. The genomic DNA G + C content was 70.0 mol%. The major fatty acids (> 10%) were determined to be iso-C_16:0, anteiso-C_15:0 and anteiso-C_17:0. The predominant menaquinones were identified as MK-9 (H₂), MK-9 (H₄) and MK-9 (H₆). The major polar lipids were found to be diphosphatidylglycerol, phosphatidylinositol and phosphatidylethanolamine. The diagnostic amino acid of the cell wall peptidoglycan was determined to be meso-diaminopimelic acid. The diagnostic sugars in cell hydrolysates were determined to be glucose and ribose. On the basis of its phenotypic, phylogenetic and chemotaxonomic characteristics, strain LAM7112^T (= CGMCC 4.7580^T = JCM 32512^T) is proposed to represent the type strain of a novel species of the genus Actinoplanes, for which the name Actinoplanes solisilvae is proposed.

List of new names and new combinations previously effectively, but not validly, published

The purpose of this announcement is to effect the valid publication of the following effectively published new names and new combinations under the procedure described in the Bacteriological Code (1990 Revision). Authors and other individuals wishing to have new names and/or combinations included in future lists should send three copies of the pertinent reprint or photocopies thereof, or an electronic copy of the published paper, to the IJSEM Editorial Office for confirmation that all of the other requirements for valid publication have been met. It is also a requirement of IJSEM and the ICSP that authors of new species, new subspecies and new combinations provide evidence that types are deposited in two recognized culture collections in two different countries. It should be noted that the date of valid publication of these new names and combinations is the date of publication of this list, not the date of the original publication of the names and combinations. The authors of the new names and combinations are as given below, and these authors’ names will be included in the author index of the present issue. Inclusion of a name on these lists validates the publication of the name and thereby makes it available in bacteriological nomenclature. The inclusion of a name on this list is not to be construed as taxonomic acceptance of the taxon to which the name is applied. Indeed, some of these names may, in time, be shown to be synonyms, or the organisms may be transferred to another genus, thus necessitating the creation of a new combination.