Ammonicoccus luteus sp. nov., a novel actinobacterium isolated from the intestine of Argyrosomus argentatus.

Authors

Fei Yang, Haifei Liu, Jiawei Li, Caifei Li, Ding Li, Ying Sun, Lifang Yang, Mingguo Jiang

Published in

Archives of microbiology. Volume 208. Issue 10. Jul 28, 2026. Epub Jul 28, 2026.

Abstract

Strain GXG 6511^T, a Gram-stain-positive, facultatively anaerobic, non-motile, non-spore-forming actinobacterium with coccoid cells, was isolated from the intestine of Argyrosomus argentatus collected in Beihai, Guangxi Zhuang Autonomous Region, China. Under anaerobic conditions, strain GXG 6511^T showed weaker growth than under aerobic conditions. After incubation on R2A medium at 28 °C for 72 h under aerobic conditions, colonies of strain GXG 6511^T were observed to be yellow, circular, rough, opaque, convex and 1-2 mm in diameter. Chemotaxonomic analysis revealed that MK-9(H₄) was the major menaquinone, while anteiso-C_15:0, iso-C_14:0 and iso-C_15:0 were identified as dominant fatty acids. Analysis of the whole-cell hydrolysate confirmed the presence of LL-diaminopimelic acid. Polar lipids profiling showed the presence of diphosphatidylglycerol, phosphatidylglycerol, and two unidentified glycolipids. The genomic DNA G + C content of the strain was determined to be 67.5%. Phylogenetic analysis based on 16 S rRNA gene sequences showed that strain GXG 6511^T formed a distinct lineage and was most closely related to Ammonicoccus fulvus ZF39^T (97.2%). Further genomic analysis revealed that strain GXG 6511^T shares an average nucleotide identity (ANI) value of 76.6% with A. fulvus ZF39^T. In addition, the digital DNA-DNA hybridization (dDDH), percentage of conserved proteins (POCP), and amino acid identity (AAI) values between the two strains were 20.6%, 77.1%, and 74.9%, respectively. On the basis of the combined phenotypic, chemotaxonomic, phylogenetic and genomic evidence, strain GXG 6511^T is considered to represent a novel species of the genus Ammonicoccus, for which the name Ammonicoccus luteus sp. nov. is proposed. The type strain is GXG 6511^T (= MCCC 1K09574^T = KCTC 59468^T). The GenBank accession numbers for the 16 S rRNA gene sequence and whole-genome shotgun assembly are PQ225952.1 and NZ_JBNZCI000000000.1, respectively.

PMID:
42517974
Bibliographic data and abstract were imported from PubMed on 28 Jul 2026.

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