Abstract:We report here the complete genomic sequence and methylome of Aggregatibacter actinomycetemcomitans strain IDH781. This rough strain is used extensively as a model organism to characterize localized aggressive periodontitis pathogenesis, the basic biology and oral cavity colonization of A. actinomycetemcomitans, and its interactions with other members of the oral microbiome.
“…The gDNA sample was subjected to PacBio RSII circular consensus sequencing. After sequencing, the results were assembled using the PacBio Hierarchical Genome Assembly Process version 2 (HGAP_Assembly.2) ( 70 ). The resulting 30 contigs were annotated using antiSMASH to search for cryptic biosynthetic gene clusters.…”
Albofungin, a natural product produced from Streptomycetes, exhibits bioactivities against bacteria, fungi, and tumor cells. The biosynthetic logic, regulations, and resistance of albofungin remain yet to be addressed.
“…The gDNA sample was subjected to PacBio RSII circular consensus sequencing. After sequencing, the results were assembled using the PacBio Hierarchical Genome Assembly Process version 2 (HGAP_Assembly.2) ( 70 ). The resulting 30 contigs were annotated using antiSMASH to search for cryptic biosynthetic gene clusters.…”
Albofungin, a natural product produced from Streptomycetes, exhibits bioactivities against bacteria, fungi, and tumor cells. The biosynthetic logic, regulations, and resistance of albofungin remain yet to be addressed.
“…Each genome was sequenced on the PacBio RS II with one SMRTcell per genome. After sequencing, each genome was assembled using the PacBio Hierarchical Genome Assembly Process version 2 (HGAP_Assembly.2) [ 39 ], contigs with poor coverage or QV scores were removed with a custom Python script, contigs were merged using Circlator (v 1.0.2), and polished using PacBio’s resequencing pipeline. The resulting assemblies were annotated using Prokka v1.11 [ 40 ] with a custom genus database [ 41 ].…”
Highlights
Whole genome sequencing of Actinomycetes reveals metabolic potential.
High quality genomes are necessary for mining of biosynthetic gene clusters.
Characterization of thiopeptides by high resolution mass spectrometry.
Thiopeptides are potent antibacterials against
Staphylococcus aureus
.
Various gram-negative species sequester host cytokines using outer membrane proteins or surface modulation by sulfated polysaccharides. An outer membrane lipoprotein (BilRI) of the periodontal pathogen Aggregatibacter actinomycetemcomitans binds several cytokines, including interleukin (IL)-8. Because IL-8 is positively charged at physiological pH, we aimed to determine whether IL-8 interacts with negatively charged lipopolysaccharide (LPS). Binding was investigated using electrophoretic mobility shift assays and microwell-based time-resolved fluorometric immunoassay. LPS from each tested strain of A. actinomycetemcomitans (N = 13), Pseudomonas aeruginosa (N = 1) and Escherichia coli (N = 1) bound IL-8. The K d value of the A. actinomycetemcomitans LPS-IL-8 interaction varied between 1.2-17 μM irrespective of the serotype and the amount of phosphorus in LPS and was significantly lower than that of the BilRI-IL-8 interaction. Moreover, IL-8 interacted with whole A. actinomycetemcomitans cells and outer membrane vesicles. Hence, LPS might be involved in binding of IL-8 to the outer membrane of A. actinomycetemcomitans. This raises an interesting question regarding whether other gram-negative periodontal pathogens use LPS for IL-8 sequestering in vivo.
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