Abstract：
:Quorum sensing and the stringent response are well-known regulation systems for the expression of virulence genes in enterohemorrhagic Escherichia coli (EHEC). However, how these two systems interact is not well known. E. coli strains with mutations in two regulation systems, ΔluxS (ECM101) and ΔluxSΔrelAΔspoT (ECM201), and the ΔluxS complement strain to ECM201 (ECM202) were created from EHEC O157:H7 EDL933 to investigate how the regulatory systems interact. The phenotypic changes of the mutant strains were characterized and compared with the wild type. The mutant strains exhibited no obvious growth defects, although acid resistance and cellular cytotoxicity were decreased significantly in all the mutant strains. Phenotypic characterization revealed that mutations in the stringent response system (ECM201 and ECM202) influenced the metabolic (defective utilization of arabinose and L-sorbose) and enzymatic activities (decreased trypsin activity, and increased α-glucosidase activity). In contrast, the quorum sensing system mutant (ECM101) did not display these phenotypes. The motility of the quorum sensing system mutant (ECM101) was unchanged, but mutation in the stringent response system influenced the motility. Our results suggest that quorum sensing interacts with the stringent response regulation system.
journal_name
J Microbiol Biotechnoljournal_title
Journal of microbiology and biotechnologyauthors
Oh KH,Cho SHsubject
Has Abstractpub_date
2014-03-28 00:00:00pages
401-7issue
3eissn
1017-7825issn
1738-8872pii
10.4014/jmb.1310.10091journal_volume
24pub_type
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