NDLI: Characterization of the dapA-nlpB Genetic Locus Involved in Regulation of Swarming Motility, Cell Envelope Architecture, Hemolysin Production, and Cell Attachment Ability in Serratia marcescens

Content Provider	PubMed Central
Author	Soo, Po-chi Wei, Jun-rong Horng, Yu-tze Hsieh, Shang-chen Ho, Shen-wu Lai, Hsin-chih
Copyright Year	2005
Abstract	Swarming migration of Serratia marcescens requires both flagellar motility and cellular differentiation and is a population-density-dependent behavior. While the flhDC and quorum-sensing systems have been characterized as important factors regulating S. marcescens swarming, the underlying molecular mechanisms are currently far from being understood. Serratia swarming is thermoregulated and is characterized by continuous surface migration on rich swarming agar surfaces at 30°C but not at 37°C. To further elucidate the mechanisms, identification of specific and conserved regulators that govern the initiation of swarming is essential. We performed transposon mutagenesis to screen for S. marcescens strain CH-1 mutants that swarmed at 37°C. Analysis of a “precocious-swarming” mutant revealed that the defect in a conserved dapASm -nlpBSm genetic locus which is closely related to the synthesis of bacterial cell wall peptidoglycan is responsible for the aberrant swarming phenotype. Further complementation and gene knockout studies showed that nlpBSm , which encodes a membrane lipoprotein, NlpB Sm , but not dapASm , is specifically involved in swarming regulation. On the other hand, dapASm but not nlpBSm is responsible for the determination of cell envelope architecture, regulation of hemolysin production, and cellular attachment capability. While the nlpBSm mutant showed similar cytotoxicity to its parent strain, the dapASm mutant significantly increased in cytotoxicity. We present evidence that DapA Sm is involved in the determination of cell-envelope-associated phenotypes and that NlpB Sm is involved in the regulation of swarming motility.
Related Links	http://dx.doi.org/10.1128/IAI.73.9.6075-6084.2005
Starting Page	6075
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	9
Volume Number	73
Language	English
Publisher	American Society for Microbiology
Publisher Date	2005-09-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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