Identification and characterization of a novel toxin-antitoxin module from Bacillus anthracis |
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Authors: | Agarwal Shivangi Agarwal Shivani Bhatnagar Rakesh |
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Affiliation: | School of Biotechnology, Jawaharlal Nehru University, New Delhi-110067, India. |
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Abstract: | Comparative genome analysis of Bacillus anthracis revealed a pair of linked genes encoding pemK (K, killer protein) and pemI (I, inhibitory protein) homologous to pem loci of other organisms. Expression of PemK in Escherichia coli and Bacillus anthracis was bacteriostatic whereas the concomitant expression of PemI reversed the growth arrest. PemK expression effectively inhibited protein synthesis with no significant effect on DNA replication. Coexpression and interaction of these proteins confirmed it to be a Type II addiction module. Thermal denaturation analysis reflected poor conformational stability of PemI as compared to PemK. Circular dichroism analysis indicated that PemI contains twice the amount of beta-sheets as PemK. Gel retardation assays demonstrated that PemI binds to its upstream DNA sequence. This study reports the first evidence of an active chromosome encoded toxin-antitoxin locus in B. anthracis. |
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Keywords: | IPTG, isopropyl β- smallcaps" >d-thiogalactopyranoside rToxin, 6×-histidine tagged recombinant toxin rAntitoxin, 6×-histidine tagged recombinant antitoxin GST, glutathione S-transferase TA, toxin-antitoxin SDS-PAGE, sodium dodecylsulfate-polyacrylamide gel/electrophoresis SSD, salmon sperm DNA |
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