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In this work we report the whole genome sequences of six new  Geobacillus  xylanolytic strains along with the genomic analysis of their capability to degrade carbohydrates. The six sequenced  Geobacillus  strains described here have a range of GC contents from 43.9% to 52.5% and clade with named  Geobacillus  species throughout the entire genus. We have identified a ~200 kb unique super-cluster in all six strains, containing five to eight distinct carbohydrate degradation clusters in a single genomic region, a feature not seen in other genera. The  Geobacillus  strains rely on a small number of secreted enzymes located within distinct clusters for carbohydrate utilization, in contrast to most biomass-degrading organisms which contain numerous secreted enzymes located randomly throughout the genomes. All six strains are able to utilize fructose, arabinose, xylose, mannitol, gluconate, xylan, and α-1,6-glucosides. The gene clusters for utilization of these seven substrates have identical organization and the individual proteins have a high percent identity to their homologs. The strains show significant differences in their ability to utilize inositol, sucrose, lactose, α-mannosides, α-1,4-glucosides and arabinan.

Genomic analysis of six new Geobacillus strains reveals highly conserved carbohydrate degradation architectures and strategies