An Essential Nonredundant Role for Mycobacterial DnaK in Native Protein Folding
All living organisms use protein chaperones to prevent proteins from becoming insoluble either spontaneously or during cellular stress that can damage proteins. The HSP70 chaperone DnaK has been well characterized in E. coli and is important for that bacterium to resist protein denaturation from heat, but is dispensable for cell growth in the absence of stress due to redundancy with other chaperone systems. However, the function of chaperones in bacterial pathogens, which are exposed to protein stress within the host, has received less attention. Here we examine the function of DnaK in mycobacteria, a genus that includes multiple human pathogens, and find that DnaK is required for cell growth. This essential function is due to a lack of redundancy with other chaperone systems for the folding of proteins, even in the absence of stress. These findings expand the paradigm of DnaK function and identify DnaK as a promising target for antibiotic development for mycobacteria.
Vyšlo v časopise:
An Essential Nonredundant Role for Mycobacterial DnaK in Native Protein Folding. PLoS Genet 10(7): e32767. doi:10.1371/journal.pgen.1004516
Kategorie:
Research Article
prolekare.web.journal.doi_sk:
https://doi.org/10.1371/journal.pgen.1004516
Souhrn
All living organisms use protein chaperones to prevent proteins from becoming insoluble either spontaneously or during cellular stress that can damage proteins. The HSP70 chaperone DnaK has been well characterized in E. coli and is important for that bacterium to resist protein denaturation from heat, but is dispensable for cell growth in the absence of stress due to redundancy with other chaperone systems. However, the function of chaperones in bacterial pathogens, which are exposed to protein stress within the host, has received less attention. Here we examine the function of DnaK in mycobacteria, a genus that includes multiple human pathogens, and find that DnaK is required for cell growth. This essential function is due to a lack of redundancy with other chaperone systems for the folding of proteins, even in the absence of stress. These findings expand the paradigm of DnaK function and identify DnaK as a promising target for antibiotic development for mycobacteria.
Zdroje
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