Myceligenerans indicum sp. nov., an actinobacterium isolated from mangrove sediment of Sundarbans, India.

Abstract

A new actinobacterial species of the genus Myceligenerans has been isolated from the intertidal sediment of Indian Sundarbans mangrove ecosystem. The isolate has been characterized based on polyphasic approaches. The isolate exhibit well-developed substrate mycelia along with the presence of cocci- and rod-shaped elements. The organism can grow across a wide range of temperature, salinity, and pH as well as on different carbon sources. Phylogenetic analyses based on 16S rRNA showed that this isolate is closely related to Myceligenerans salitolerans XHU 5031 (99% identity; 100% coverage). Presence of ketosynthase domain representing polyketide synthases in the isolate provides evidence of its potential ability to produce secondary metabolites. Multigene phylogeny based onatpD and rpoB gene sequences confirmed it as a new species within the family Promicromonosporaceae (Phylum Actinobacteria). The DNA G + C content of the isolate has been determined as 72mol%. The peptidoglycan type was A4α and the whole-cell hydrolysates contained glucose, galactose, and mannose. The polar lipids were represented by diphosphatidylglycerol, one unknown phospholipid and one unknown glycolipid. Major fatty acids present in the isolate are anteiso-C15, iso-C15, iso-C16, and anteiso-C17. Whole-genome sequence indicates the size of genome is ~ 5 Mbp. GGDC (%), orthoANIu (%), and AAI of I2 genome indicated 28.9%, 77.44% and 0.859 identity with the genome of Myceligenerans xiligouense strain DSM 15,700. The isolate I2 has been proposed as a new species, Myceligenerans indicum sp. nov. The genome sequence has been deposited to GenBank/ENA/DDBJ under the accession number JABBYC000000000.