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Identification of Stringent Response-Related and Potential Serological Proteins Released from Bacillus anthracis Overexpressing the RelA/SpoT Homolog, Rsh Bant

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Abstract

RelA and SpoT synthesize ppGpp, a key effector molecule that facilitates the adaptation of bacteria to nutrient starvation and other stresses, known as the stringent response. To investigate the role of Rsh Bant , a putative RelA/SpoT homolog (encoded by BAS4302) in Bacillus anthracis, we examined the alteration of the secretome profiles after the overexpression of a functional His-Rsh Bant protein in the B. anthracis strain Sterne at the stationary growth phase. In the ppGpp-deficient E. coli mutant strain CF1693, overexpression of Rsh Bant restored a ppGpp-dependent growth defect on minimal glucose media. The secretome profiles obtained using a two-dimensional electrophoresis (2-DE) analysis were altered by overexpression of Rsh Bant in B. anthracis. Among the 66 protein spots differentially expressed >1.5-fold, the 29 proteins were abundant for further identification using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Functional categorization of those proteins implicated their involvement in various biological activities. Taken together, our results imply that overexpression of a functional His-Rsh Bant can lead to the increased levels of intracellular ppGpp in B. anthracis, resulting in the significant changes in its secretome profiling. The stringent response-controlled proteins identified are likely useful as potential targets for serodiagnostic applications.

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Acknowledgments

This work was funded through a grant from the National Research Foundation of Korea (NRF) through the Korean government (MSIP) (No. 2011-0030049).

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Correspondence to Jang W. Yoon or Young Gyu Chai.

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Se Kye Kim and Moon Kyoo Park equally contributed to this work.

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Kim, S.K., Park, M.K., Kim, S.H. et al. Identification of Stringent Response-Related and Potential Serological Proteins Released from Bacillus anthracis Overexpressing the RelA/SpoT Homolog, Rsh Bant . Curr Microbiol 69, 436–444 (2014). https://doi.org/10.1007/s00284-014-0606-8

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  • DOI: https://doi.org/10.1007/s00284-014-0606-8

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