16 research outputs found

    Sphaerocyclamide, a prenylated cyanobactin from the cyanobacterium Sphaerospermopsis sp. LEGE 00249

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    Cyanobactins are a family of linear and cyclic peptides produced through the post-translational modification of short precursor peptides. A mass spectrometry-based screening of potential cyanobactin producers led to the discovery of a new prenylated member of this family of compounds, sphaerocyclamide (1), from Sphaerospermopsis sp. LEGE 00249. The sphaerocyclamide biosynthetic gene cluster (sph) encoding the novel macrocyclic prenylated cyanobactin, was sequenced. Heterologous expression of the sph gene cluster in Escherichia coli confirmed the connection between genomic and mass spectrometric data. Unambiguous establishment of the orientation and site of prenylation required the full structural elucidation of 1 using Nuclear Magnetic Resonance (NMR), which demonstrated that a forward prenylation occurred on the tyrosine residue. Compound 1 was tested in pharmacologically or ecologically relevant biological assays and revealed moderate antimicrobial activity towards the fouling bacterium Halomonas aquamarina CECT 5000.Peer reviewe

    Cyclic peptide production using a macrocyclase with enhanced substrate promiscuity and relaxed recognition determinants

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    This project was supported by grants from the ERC (no. 339367, MJ), BBSRC IBCatalyst (no. BB/M028526/1, MJ, WEH), BBSRC FoF (no. BB/M013669/1, MJ, WEH), IBioIC Exemplar (no. 2014-2-4, MJ, WEH), an AstraZeneca studentship (MJ, WEH, LT, KR), the Academy of Finland (no. 259505, DPF) and the SULSA leaders award (WEH). The authors like to thank the Aberdeen Proteomics Facility and the Aberdeen School of Natural and Computing Sciences MS Facility for LCMS analysis. Electronic supplementary information (ESI) available: Experimental section, Fig. S1–S60 and Tables S1–S3. See DOI: 10.1039/c7cc05913bPeer reviewedPublisher PD

    Možnosti a způsoby využití kalů a sedimentů z ČOV

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    Stav nakládání s čistírenskými kaly v ČR - aktualizace za období 2002-2004(5) s vazbou na trendy a vývoj legislativy. Vývoj produkce kalů z komunálních ČOV a nakládání s kaly. Charakteristika technického stavu kalového hospodářství v ČR. Hlavní provozně využitelné metody hygienizace kalu. Provozní zkušenosti s přímou aplikací kalů na zemědělskou půdu. Vliv technologie odstranění nutrientů z odpadních vod na produkci kalů. Prognóza vývoje následného využití/odstranění kalu z ČOV. Dosahované složení kalů a limity rizikových látek v kalech ve vztahu k platné legislativě. Nové trendy nakládání s kaly
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