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Ye L.,Vrije Universiteit Brussel | Matthijs S.,Institute Of Recherches Microbiologiques Wiame | Bodilis J.,CNRS Laboratory of Microbiology Signals and Microenvironment | Hildebrand F.,Vrije Universiteit Brussel | And 2 more authors.
BioMetals | Year: 2014

All fluorescent pseudomonads (Pseudomonas aeruginosa, P. putida, P. fluorescens, P. syringae and others) are known to produce the high-affinity peptidic yellow-green fluorescent siderophore pyoverdine. These siderophores have peptide chains that are quite diverse and more than 50 pyoverdine structures have been elucidated. In the majority of the cases, a Pseudomonas species is also able to produce a second siderophore of lower affinity for iron. Pseudomonas fluorescens ATCC 17400 has been shown to produce a unique second siderophore, (thio)quinolobactin, which has an antimicrobial activity against the phytopathogenic Oomycete Pythium debaryanum. We show that this strain has the capacity to utilize 16 different pyoverdines, suggesting the presence of several ferripyoverdine receptors. Analysis of the draft genome of P. fluorescens ATCC 17400 confirmed the presence of 55 TonB-dependent receptors, the largest so far for Pseudomonas, among which 15 are predicted to be ferripyoverdine receptors (Fpv). Phylogenetic analysis revealed the presence of two different clades containing ferripyoverdine receptors, with sequences similar to the P. aeruginosa type II FpvA forming a separate cluster. Among the other receptors we confirmed the presence of the QbsI (thio)quinolobactin receptor, an ferri-achromobactin and an ornicorrugatin receptor, several catecholate and four putative heme receptors. Twenty five of the receptors genes were found to be associated with genes encoding extracytoplasmic sigma factors (ECF σ) and transmembrane anti-σ sensors. © 2014 Springer Science+Business Media. Source

Fislage M.,Pleinlaan | Fislage M.,Vrije Universiteit Brussel | Roovers M.,Institute Of Recherches Microbiologiques Wiame | Munnich S.,Pleinlaan | And 4 more authors.
Acta Crystallographica Section F: Structural Biology and Crystallization Communications | Year: 2011

Methyltransferases form a major class of tRNA-modifying enzymes that are needed for the proper functioning of tRNA. Here, the expression, purification and crystallization of two related putative tRNA methyltransferases from two kingdoms of life are reported. The protein encoded by the gene pf1002 from the archaeon Pyrococcus furiosus was crystallized in the monoclinic space group P21. A complete data set was collected to 2.2 Å resolution. The protein encoded by the gene ttc1157 from the eubacterium Thermus thermophilus was crystallized in the trigonal space group P3221. A complete data set was collected to 2.05 Å resolution. © 2011 International Union of Crystallography. All rights reserved. Source

Matthijs S.,Institute Of Recherches Microbiologiques Wiame | Vander Wauven C.,Institute Of Recherches Microbiologiques Wiame | Cornu B.,Institute Of Recherches Microbiologiques Wiame | Ye L.,Vrije Universiteit Brussel | And 3 more authors.
Research in Microbiology | Year: 2014

Mupirocin is a polyketide antibiotic with broad antibacterial activity. It was isolated and characterized about 40 years ago from Pseudomonas fluorescens NCIMB 10586. To study the phylogenetic distribution of mupirocin producing strains in the genus Pseudomonas a large collection of Pseudomonas strains of worldwide origin, consisting of 117 Pseudomonas type strains and 461 strains isolated from different biological origins, was screened by PCR for the mmpD gene of the mupirocin gene cluster. Five mmpD+ strains from different geographic and biological origin were identified. They all produced mupirocin and were strongly antagonistic against Staphylococcus aureus. Phylogenetic analysis showed that mupirocin production is limited to a single species.Inactivation of mupirocin production leads to complete loss of invitro antagonism against S. aureus, except on certain iron-reduced media where the siderophore pyoverdine is responsible for the invitro antagonism of a mupirocin-negative mutant. In addition to mupirocin some of the strains produced lipopeptides of the massetolide group. These lipopeptides do not play a role in the observed invitro antagonism of the mupirocin producing strains against S. aureus. © 2014 Institut Pasteur. Source

Ye L.,Vrije Universiteit Brussel | Ballet S.,Vrije Universiteit Brussel | Hildebrand F.,Vrije Universiteit Brussel | Laus G.,Vrije Universiteit Brussel | And 5 more authors.
BioMetals | Year: 2013

The structure of a pyoverdine produced by Pseudomonas putida, W15Oct28, was elucidated by combining mass spectrometric methods and bioinformatics by the analysis of non-ribosomal peptide synthetase genes present in the newly sequenced genome. The only form of pyoverdine produced by P. putida W15Oct28 is characterized to contain α-ketoglutaric acid as acyl side chain, a dihydropyoverdine chromophore, and a 12 amino acid peptide chain. The peptide chain is unique among all pyoverdines produced by Pseudomonas subspecies strains. It was characterized as -l-Asp-l-Ala-d-AOHOrn-l-Thr-Gly-c[l-Thr(O-)-l- Hse-d-Hya-l-Ser-l-Orn-l-Hse-l-Ser-O-]. The chemical formula and the detected and calculated molecular weight of this pyoverdine are: C65H 93N17O32, detected mass 1624.6404 Da, calculated mass 1624.6245. Additionally, pyoverdine structures from both literature reports and bioinformatics prediction of the genome sequenced P. putida strains are summarized allowing us to propose a scheme based on pyoverdines structures as tool for the phylogeny of P. putida. This study shows the strength of the combination of in silico analysis together with analytical data and literature mining in determining the structure of secondary metabolites such as peptidic siderophores. © 2013 Springer Science+Business Media New York. Source

Matthijs S.,Institute Of Recherches Microbiologiques Wiame | Brandt N.,Institute Of Recherches Microbiologiques Wiame | Ongena M.,University of Liege | Achouak W.,Aix - Marseille University | And 2 more authors.
BioMetals | Year: 2016

The genome of Pseudomonas thivervalensis LMG 21626T has been sequenced and a genomic, genetic and structural analysis of the siderophore mediated iron acquisition was undertaken. Pseudomonas thivervalensis produces two structurally new siderophores, pyoverdine PYOthi which is typical for P. thivervalensis strains and a closely related strain, and the lipopeptidic siderophore histicorrugatin which is also detected in P. lini. Histicorrugatin consists out of an eight amino acid long peptide which is linked to octanoic acid. It is structurally related to the siderophores corrugatin and ornicorrugatin. Analysis of the proteome for TonB-dependent receptors identified 25 candidates. Comparison of the TonB-dependent receptors of P. thivervalensis with the 17 receptors of its phylogenetic neighbor, P. brassicacearum subsp. brassicacearum NFM 421, showed that NFM 421 shares the same set of receptors with LMG 21626T, including the histicorrugatin receptor. An exception was found for their cognate pyoverdine receptor which can be explained by the observation that both strains produce structurally different pyoverdines. Mass analysis showed that NFM 421 did not produce histicorrugatin, but the analogue ornicorrugatin. Growth stimulation assays with a variety of structurally distinct pyoverdines produced by other Pseudomonas species demonstrated that LMG 21626T and NFM 421 are able to utilize almost the same set of pyoverdines. Strain NFM 421 is able utilize two additional pyoverdines, pyoverdine of P. fluorescens Pf0–1 and P. citronellolis LMG 18378T, these pyoverdines are probably taken up by the FpvA receptor of NFM 421. © 2016 Springer Science+Business Media New York Source

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