Abstract
In the present study, a comprehensive proteomic analysis of Brucella melitensis (B. melitensis) strain ATCC23457 was carried out to investigate proteome alterations in response to in vitro-induced nutrient stress. Our analysis resulted in the identification of 2440 proteins, including 365 hypothetical proteins and 850 potentially secretory proteins representing ~77.8% of the B. melitensis proteome. Utilizing a proteogenomics approach, we provide translational evidence for eight novel putative protein-coding genes and confirmed the coding potential of 31 putatively annotated pseudogenes, thus refining the existing genome annotation. Further, using a label-free quantitative proteomic approach, new insights into the cellular processes governed by nutrient stress, including enrichment of amino acid metabolism (E), transcription (K), energy production and conversion (C), and biogenesis (J) processes were obtained. Pathway analysis revealed the enrichment of survival and homeostasis maintenance pathways, including type IV secretion system, nitrogen metabolism, and urease pathways in response to nutrient limitation. To conclude, our analysis demonstrates the utility of in-depth proteomic analysis in enabling improved annotation of the B. melitensis genome. Further, our results indicate that B. melitensis undergoes metabolic adaptations during nutrient stress similar to other Brucella. sp, and adapts itself for long-term persistence and survival.
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Acknowledgements
We thank Karnataka Biotechnology and Information Technology Services (KBITS), Government of Karnataka, for support to the Center for Systems Biology and Molecular Medicine at Yenepoya (Deemed to be University) under the Biotechnology Skill Enhancement Programme (BiSEP) in Multiomics Technology. SMP is a recipient of INSPIRE Faculty Award from the Department of Science and Technology (DST), Government of India. SKB is a recipient of Bioinformatics National Certification (BINC)-Junior Research Fellowship from the Department of Biotechnology (DBT), Government of India. NA is a recipient of research fellowship assistance from YU. We thank Saketh Kapoor for his assistance in sample processing and data analysis.
Funding
This study was funded by Indian Council of Medical Research, Govt. of India [Grant No. Zon.15/11/2014-ECD-II].
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AAH, SMP, TSKP, HFD and RSK contributed to conception and design of the study. AAH, PRK, NMB, LRS, RSK provided samples for the study. SMP, and NA processed the samples. SMP, YS and SKB acquired and analyzed the data. AAH, SMP, YS and SKB prepared tables and figures. AAH, SMP, YS carried out the literature search and wrote sections of the manuscript. All authors contributed to manuscript revision, read and approved the submitted version.
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All protocols for sample collection from humans were approved by the Ethical Committee of the Dr. G.M. Taori Central India Institute of Medical Sciences (CIIMS).
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Husain, A.A., Pinto, S.M., Agarwal, N. et al. Comprehensive Proteomic Analysis of Brucella melitensis ATCC23457 Strain Reveals Metabolic Adaptations in Response to Nutrient Stress. Curr Microbiol 80, 20 (2023). https://doi.org/10.1007/s00284-022-03105-y
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DOI: https://doi.org/10.1007/s00284-022-03105-y