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In recent years, agar-degrading bacteria have gained significant interest due to their biotechnological, environmental, microbiological, and industrial applications. Agar poses challenges such as marine waste accumulation, difficult industrial processing, limited natural degradability, and sustainability concerns due to high demand and overharvesting of red algae. The present study addresses the need for efficient agar-degrading microorganisms by isolating Aliagarivorans sp. strain DM1 from biofilm on fabric surfaces in the intertidal regions of the Arabian Sea, India. Phylogenetic analysis revealed that strain DM1 is closely related to Aliagarivorans taiwanensis AAT1 T , and it exhibited significant agar-degrading activity on Zobell marine agar plates. Whole genome sequencing of Aliagarivorans sp. strain DM1, conducted using the Illumina NovaSeq platform, yielded a genome size of 4,898,415 bp with an average G + C content of 53.3%. The genome includes 4,518 predicted protein-coding genes (CDS), 86 transfer RNA (tRNA) genes, and two ribosomal RNA (rRNA) genes, with thirteen predicted agarases identified. The highest enzyme activity recorded was 51.00 U mL -1 on the 6th day of incubation using 10% inoculum, with optimal conditions of pH 8-9, 0.8 M NaCl, and temperatures between 50 and 60 °C. These findings underscore the promise of Aliagarivorans sp. strain DM1 in developing efficient enzymatic processes that can be applied in various biotechnological and industrial fields, including waste management and agaro-oligosaccharide production. Furthermore, strain DM1 possesses several key characteristics that enhance its adaptability and utility in marine and industrial applications, surpassing closely related strains in enzyme stability, environmental tolerance, and industrial versatility., (© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)

Colwellia sp. Arc7-635, a psychrophilic denitrifying bacterium isolated from Arctic seawater, uses NO 3 - or NH 4 + as the sole nitrogen source to grow at low temperatures. In this article, we describe the complete genome of Colwellia sp. Arc7-635. The genome has one circular chromosome of 4,741,350 bp (38.41 mol% G+C content), consisting of 3841 coding genes, 91 tRNA genes, as well as seven rRNA operons of 16S-23S-5S rRNA, and one operon of 16S-23S-5S-5S rRNA. According to the genomic annotation results, strain Colwellia sp. Arc7-635 encodes a complete denitrifying pathway consisting of genes affiliated with nitrate reductase, nitrite reductase, nitric oxide reductase, and nitrous oxide reductase. Genes affiliated with nitrate reduction to ammonia including nitrate reductases (NapA and NapB) and nitrite reductases (NirA, NirB, and NirD) were also identified. The whole genome sequences of Arc7-635 provide information that is useful for further clarifying nitrogen metabolisms and facilitate its potential applications in the bioremediation of nitrogen pollutions.

Here, we present the high-quality draft genome sequence of the agar-degrading marine gammaproteobacterium Alteromonadaceae sp. strain G7, which was isolated from coastal seawater to be utilized as a bioresource for production of agar-derived biofuels. The 3.91-Mb genome contains a number of genes encoding algal polysaccharide-degrading enzymes such as agarases and sulfatases.

Idiomarina xiamenensis strain 10-D-4(T) was isolated from an oil-degrading consortium enriched from surface seawater around the Xiamen island. Here, we present the draft genome of strain 10-D-4(T), which contains 2,899,282 bp with a G+C content of 49.48% and contains 2,673 protein-coding genes and 43 tRNA genes.

Alishewanella agri BL06(T) (= KCTC 22400(T) = JCM 15597(T)) was isolated from landfill soil in Pohang, South Korea. A. agri showed the ability to degrade pectin, a structural heteropolysaccharide present in the cell wall of plants. Here we report the genome sequence of Alishewanella agri BL06(T), the second sequenced strain in the genus Alishewanella.

Here, we report the draft genome sequence of Antarctic sea ice bacterium Glaciecola punicea ACAM 611(T), the type species of the genus Glaciecola. A blue-light-absorbing proteorhodopsin gene is present in the 3.08-Mb genome. This genome sequence can facilitate the study of the physiological metabolisms and ecological roles of sea ice bacteria.

In this study, we isolated xylan-degrading bacteria from a coastal lagoon of Micronesia and identified the bacteria as Marinobacterium stanieri S30. GSFLX 454 pyrosequencing and sequence analysis of the M. stanieri S30 genome generated 4,007 predicted open reading frames (ORFs) that could be candidate genes for producing enzymes with different catalytic functions.

Glaciecola nitratireducens strain FR1064(T) was isolated from seawater and described as a new species by Baik et al. in 2006. The genome size is about 1.01 to 1.26 Mb smaller than two reported Glaciecola genomes, indicating the gain or loss of large genome segments in the evolution of Glaciecola strains.

Idiomarina sp. strain A28L was isolated from the alkaline brackish water of a high-altitude lake, Pangong Lake. Here, we present the draft genome of Idiomarina sp. strain A28L, which contains 2,591,567 bp with a G+C content of 45.5 mol% and contains 2,299 protein-coding genes and 56 structural RNAs.

Glaciecola sp. strain 4H-3-7+YE-5 was isolated from subseafloor sediments at Suruga Bay in Japan and is capable of efficiently hydrolyzing cellulose and xylan. The complete genome sequence of Glaciecola sp. 4H-3-7+YE-5 revealed several genes encoding putatively novel glycoside hydrolases, offering a high potential for plant biomass degradation.