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Actinobacteria in the genus Streptomyces are critical players in microbial communities that decompose complex carbohydrates in the soil, and these bacteria have recently been implicated in the deconstruction of plant polysaccharides for some herbivorous insects. Despite the importance of Streptomyces to carbon cycling, the extent of their plant biomass-degrading ability remains largely unknown. In this study, we compared four strains of Streptomyces isolated from insect herbivores that attack pine trees: DpondAA-B6 (SDPB6) from the mountain pine beetle, SPB74 from the southern pine beetle, and SirexAA-E (SACTE) and SirexAA-G from the woodwasp, Sirex noctilio. Biochemical analysis of secreted enzymes demonstrated that only two of these strains, SACTE and SDPB6, were efficient at degrading plant biomass. Genomic analyses indicated that SACTE and SDPB6 are closely related and that they share similar compositions of carbohydrate-active enzymes. Genome-wide proteomic and transcriptomic analyses revealed that the major exocellulases (GH6 and GH48), lytic polysaccharide monooxygenases (AA10), and mannanases (GH5) were conserved and secreted by both organisms, while the secreted endocellulases (GH5 and GH9 versus GH9 and GH12) were from diverged enzyme families. Together, these data identify two phylogenetically related insect-associated Streptomyces strains with high biomass-degrading activity and characterize key enzymatic similarities and differences used by these organisms to deconstruct plant biomass.
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http://dx.doi.org/10.1128/AEM.01133-14 | DOI Listing |
Appl Environ Microbiol
December 2024
State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
Mildiomycin is a representative peptidyl nucleoside antibiotic and was first isolated from , which has been used as an important biological agent to control powdery mildew in plants. Despite its importance, the biosynthetic pathways and regulatory mechanisms remain to be fully elucidated. In this study, we identified MilO as a positive pathway-specific regulator of mildiomycin biosynthesis in the heterologous host .
View Article and Find Full Text PDFInt Microbiol
December 2024
Department of Biological and Chemical Engineering, USCR Molecular Bacteriology and Genomics, National Institute of Applied Science and Technology, University of Carthage, 1080, Tunis Cedex, Tunisia.
This study re-evaluates Pseudofrankia strains, traditionally regarded as parasitic dwellers of actinorhizal root nodules due to their inability to fix nitrogen (Fix -) and/or nodulate (Nod -), as potential plant growth-promoting bacteria (PGPB). We compared plant growth-promoting traits (PGPTs) between Pseudofrankia strains, including one newly sequenced strain BMG5.37 in this study and typical (Fix + /Nod +) Frankia, Protofrankia, and Parafrankia, as well as non-frankia actinorhizal species Nocardia and Micromonospora, and the phytopathogenic Streptomyces.
View Article and Find Full Text PDFJ Agric Food Chem
December 2024
Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Qingdao 266003, People's Republic of China.
, a common foodborne pathogen, has a close association with agriculture and food. With the rapid emergence and widespread dissemination of antimicrobial resistance, efforts have been directed toward developing and studying new antimicrobial compounds to inhibit the growth of and other foodborne pathogens, thereby preventing contamination and ensuring food safety. Herein, we reported eight new aromatic polyketides, naphpyrones A-H (-), from the heterologous expression strain A3(2)/ ΔH3.
View Article and Find Full Text PDFAppl Environ Microbiol
December 2024
MOE Key Laboratory of Industrial Fermentation Microbiology, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, China.
Over the past three decades, the integrase (Int) from phage C31 has become a valuable genome engineering tool across various species. C31 Int was thought to mediate unidirectional site-specific integration ( × to and ) in the absence of the phage-encoded recombination directionality factor (RDF). However, we have shown in this study that Int can also catalyze reverse excision ( × to and ) at low frequencies in and , causing genetic instability in engineered strains.
View Article and Find Full Text PDFMicrob Cell Fact
December 2024
Xiangya International Academy of Translational Medicine, Central South University, Tongzipo Road, #172, Yuelu District, Changsha, Hunan, 410013, China.
Background: Universal stress proteins (USPs) are prevalent in various bacteria to cope with different adverse stresses, while their possible effects on secondary metabolisms of hosts are unclear. Tiancimycins (TNMs) are ten-membered endiynes possessing excellent potential for development of anticancer antibody-drug conjugates. During our efforts to improve TNMs titer, a high-producing strain Streptomyces sp.
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