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psp actinobacteria

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https://www.readbyqxmd.com/read/27865622/protecting-from-envelope-stress-variations-on-the-phage-shock-protein-theme
#1
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Riccardo Manganelli, Maria Laura Gennaro
During envelope stress, critical inner-membrane functions are preserved by the phage-shock-protein (Psp) system, a stress response that emerged from work with Escherichia coli and other Gram-negative bacteria. Reciprocal regulatory interactions and multiple effector functions are well documented in these organisms. Searches for the Psp system across phyla reveal conservation of only one protein, PspA. However, examination of Firmicutes and Actinobacteria reveals that PspA orthologs associate with non-orthologous regulatory and effector proteins retaining functions similar to those in Gram-negative counterparts...
November 16, 2016: Trends in Microbiology
https://www.readbyqxmd.com/read/25899163/the-psp-system-of-mycobacterium-tuberculosis-integrates-envelope-stress-sensing-and-envelope-preserving-functions
#2
Pratik Datta, Janani Ravi, Valentina Guerrini, Rinki Chauhan, Matthew B Neiditch, Scarlet S Shell, Sarah M Fortune, Baris Hancioglu, Oleg A Igoshin, Maria Laura Gennaro
The bacterial envelope integrates essential stress-sensing and adaptive functions; thus, envelope-preserving functions are important for survival. In Gram-negative bacteria, envelope integrity during stress is maintained by the multi-gene Psp response. Mycobacterium tuberculosis was thought to lack the Psp system since it encodes only pspA and no other psp ortholog. Intriguingly, pspA maps downstream from clgR, which encodes a transcription factor regulated by the MprAB-σ(E) envelope-stress-signaling system...
August 2015: Molecular Microbiology
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