title: Transcriptomic analysis reveals new regulatory roles of Clp signaling in secondary metabolite biosynthesis and surface motility in Lysobacter enzymogenes OH11.
abstract: Lysobacter enzymogenes is a bacterial biological control agent emerging as a new source of antibiotic metabolites, such as heat-stable antifungal factor (HSAF) and the antibacterial factor WAP-8294A2. The regulatory mechanism(s) for antibiotic metabolite biosynthesis remains largely unknown in L. enzymogenes. Clp, a cyclic adenosine monophosphate (cAMP)-receptor-like protein, is shown to function as a global regulator in modulating biocontrol-associated traits in L. enzymogenes. However, the genetic basis of Clp signaling remains unclear. Here, we utilized transcriptome/microarray analysis to determine the Clp regulon in L. enzymogenes. We showed that Clp is a global regulator in gene expression, as the transcription of 775 genes belonging to 19 functional groups was differentially controlled by Clp signaling. Analysis of the Clp regulon detected previously characterized Clp-modulated functions as well as novel loci. These include novel loci involved in antibiotic metabolite biosynthesis and surface motility in L. enzymogenes. We further showed experimentally that Clp signaling played a positive role in regulating the biosynthesis of HSAF and WAP-8294A2, as well as surface motility which is a type-IV-pilus-dependent trait. The regulation by Clp signaling of antibiotic (HSAF and WAP-8294A2) biosynthesis and surface motility was found to be independent. Importantly, we identified a factor Lysobacter acetyltransferase (Lat), a homologue of histone acetyltransferase Hpa2, which was regulated by Clp and involved in HSAF biosynthesis, but not associated with WAP-8294A2 production and surface motility. Overall, our study provided new insights into the regulatory role and molecular mechanism of Clp signaling in L. enzymogenes.
authors.affiliation: College of Plant Protection, Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Yansheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Zhao
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Zhenhe
authors.initials: Z
authors.lastname: Su
authors.forename: Gaoge
authors.initials: G
authors.lastname: Xu
authors.forename: Liangcheng
authors.initials: L
authors.lastname: Du
authors.forename: Justin M
authors.initials: JM
authors.lastname: Huffman
authors.forename: Vittorio
authors.initials: V
authors.lastname: Venturi
authors.forename: Guoliang
authors.initials: G
authors.lastname: Qian
authors.forename: Fengquan
authors.initials: F
authors.lastname: Liu
mesh_terms: D000890:Anti-Infective Agents / Q000378:metabolism*; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D008124:Locomotion; D053528:Lysobacter / Q000235:genetics / Q000502:physiology*; D046228:Microarray Analysis; D064210:Secondary Metabolism; D015398:Signal Transduction; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D000890:Anti-Infective Agents; D014157:Transcription Factors