The Mycobacterium tuberculosis relBE toxin:antitoxin genes are stress-responsive modules that regulate growth through translation inhibition.
The Mycobacterium tuberculosis relBE toxin:antitoxin genes are stress-responsive modules that regulate growth through translation inhibition.
复制标题
DOI：
10.1007/s12275-015-5333-8
复制
发表时间：
2015-11
期刊：
影响因子：
--
通讯作者：
Clark-Curtiss JE
中科院分区：
文献类型：
--
作者：
Korch SB;Malhotra V;Contreras H;Clark-Curtiss JE
(Toxin-antitoxin (TA) genes are ubiquitous among bacteria and are associated with persistence and dormancy. Following exposure to unfavorable environmental stimuli, several species (Escherichia coli, Staphylococcus aureus, Myxococcus xanthus) employ toxin proteins such as RelE and MazF to downregulate growth or initiate cell death. Mycobacterium tuberculosis possesses three Rel TA modules (RelMtb): RelBEMtb, RelFGMtb and RelJKMtb (Rv1246c-Rv1247c, Rv2865-Rv2866, and Rv3357-Rv3358, respectively), which inhibit mycobacterial growth when the toxin gene (relE, relG, relK) is expressed independently of the antitoxin gene (relB, relF, relJ). In the present study, we examined the in vivo mechanism of the RelEMtb toxin protein, the impact of RelEMtb on M. tuber-culosis physiology and the environmental conditions that regulate all three relMtb modules. RelEMtb negatively impacts growth and the structural integrity of the mycobacterial envelope, generating cells with aberrant forms that are prone to extensive aggregation. At a time coincident with growth defects, RelEMtb mediates mRNA degradation in vivo resulting in significant changes to the proteome. We establish that relMtb modules are stress responsive, as all three operons are transcriptionally activated following mycobacterial exposure to oxidative stress or nitrogen-limiting growth environments. Here we present evidence that the relMtb toxin:antitoxin family is stress-responsive and, through the degradation of mRNA, the RelEMtb toxin influences the growth, proteome and morphology of mycobacterial cells.
登录
查看更多内容
细菌程序性细胞死亡和细菌多细胞行为。
影响因子：
4.5
作者：
通讯作者：
--
影响因子：
14.9
作者：
Fozo EM;Makarova KS;Shabalina SA;Yutin N;Koonin EV;Storz G
通讯作者：
Storz G
影响因子：
3.2
作者：
Jorgensen, Mikkel G.;Pandey, Deo P.;Gerdes, Kenn
通讯作者：
Gerdes, Kenn
影响因子：
3.2
作者：
Fu, Zhibiao;Tamber, Sandeep;Cheung, Ambrose L.
通讯作者：
Cheung, Ambrose L.
DOI：
10.1074/mcp.m112.018846
发表时间：
2013-05
期刊：
Molecular & cellular proteomics : MCP
影响因子：
--
作者：
Albrethsen J;Agner J;Piersma SR;Højrup P;Pham TV;Weldingh K;Jimenez CR;Andersen P;Rosenkrands I
通讯作者：
Rosenkrands I