Abstract
Klebsiella variicola is generally known as endophyte as well as lignocellulose-degrading strain. However, their roles in goat omasum along with lignocellulolytic genetic repertoire are not yet explored. In this study, five different pectin-degrading bacteria were isolated from a healthy goat omasum. Among them, a new Klebsiella variicola strain HSTU-AAM51 was identified to degrade lignocellulose. The genome of the HSTU-AAM51 strain comprised 5,564,045 bp with a GC content of 57.2% and 5312 coding sequences. The comparison of housekeeping genes (16S rRNA, TonB, gyrase B, RecA) and whole-genome sequence (ANI, pangenome, synteny, DNA-DNA hybridization) revealed that the strain HSTU-AAM51 was clustered with Klebsiella variicola strains, but the HSTU-AAM51 strain was markedly deviated. It consisted of seventeen cellulases (GH1, GH3, GH4, GH5, GH13), fourteen beta-glucosidase (2GH3, 7GH4, 4GH1), two glucosidase, and one pullulanase genes. The strain secreted cellulase, pectinase, and xylanase, lignin peroxidase approximately 76–78 U/mL and 57–60 U/mL, respectively, when it was cultured on banana pseudostem for 96 h. The catalytically important residues of extracellular cellulase, xylanase, mannanase, pectinase, chitinase, and tannase proteins (validated 3D model) were bound to their specific ligands. Besides, genes involved in the benzoate and phenylacetate catabolic pathways as well as laccase and DiP-type peroxidase were annotated, which indicated the strain lignin-degrading potentiality. This study revealed a new K. variicola bacterium from goat omasum which harbored lignin and cellulolytic enzymes that could be utilized for the production of bioethanol from lignocelluloses.
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Acknowledgements
Md. Azizul Haque would like to express gratitude to the TWAS staff for their cordial and sincere cooperation. The authors are also grateful to Invent Technologies, Banani, Dhaka, Bangladesh, for their support of next-generation sequencing.
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The research was supported by The World Academy of Sciences (TWAS), Trieste, Italy (Research Grants: 17–475 RG/BIO/AS_I, January, 2018-June, 2020).
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Md. Abdullah-Al-Mamun & Md. Shohorab Hossain: experiment, genome analysis, partial writing.
Gautam Chandra Debnath, Md. Ashikujjaman Ashik, Zoherul Hasan: bioinformatics, analysis and data curation.
Sharmin Sultana, Snygdha Rani Das, Shefali Aktar: strain isolation, biochemical analysis.
Aminur Rahman: bioinformatics, data analysis, critical reviewing and editing.
Md. Yeasin Prodhan, Kye Man Cho: resources and proof reading.
Md. Azizul Haque: fund acquisition, conceptualization, genome sequencing, experiments, analysis, manuscript writing, edition, supervision.
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Md. Abdullah-Al-Mamun, Hossain, M., Debnath, G.C. et al. Unveiling lignocellulolytic trait of a goat omasum inhabitant Klebsiella variicola strain HSTU-AAM51 in light of biochemical and genome analyses. Braz J Microbiol 53, 99–130 (2022). https://doi.org/10.1007/s42770-021-00660-7
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DOI: https://doi.org/10.1007/s42770-021-00660-7