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  • 1
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    Bacicyclin, a new antibacterial cyclic hexapeptide from Bacillus sp. strain BC028 isolated from Mytilus edulis (2018)
    Elsevier
    In:  Bioorganic & Medicinal Chemistry Letters, 28 (4). pp. 558-561.
    Details
    Publication Date: 2021-02-08
    Description: A new cyclic hexapeptide, cyclo-(Gly-Leu-Val-IIe-Ala-Phe), named bacicyclin (1), was isolated from a marine Bacillus sp. strain associated with Mytilus edulis. The sequences of the amino acid building blocks of the cyclic peptide and its structure were determined by 1D- and 2D-NMR techniques. Marfey's analysis showed that the amino acid building blocks had L-configuration in all cases except for alanine and phenylalanine, which had D-configuration. Bacicyclin (1) exhibited antibacterial activity against the clinically relevant strains Enterococcus faecalis and Staphylococcus aureus with minimal inhibitory concentration values of 8 and 12 μM, respectively. These results demonstrate the potential of marine bacteria as a promising source for the discovery of new antibiotics.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.bmcl.2018.01.062
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  • 2
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    Emended description of the genus Rhodothalassium Imhoff et al., 1998 and proposal of Rhodothalassiaceae fam. nov. and Rhodothalassiales ord. nov (2013)
    Elsevier
    In:  Systematic and Applied Microbiology, 36 (1). pp. 28-32.
    Details
    Publication Date: 2019-09-23
    Description: Five strains (JA325, JA389, JA473, JA563 and JA582) of Gram stain-negative, vibrioid to spiral shaped, phototrophic purple bacteria were isolated from solar salterns of India. All strains contained bacteriochlorophyll-a and carotenoids of the spirilloxanthin series as photosynthetic pigments. C18:1ω7c, C18:1ω7c 11-methyl and C16:0 were the major fatty acids of all strains. Diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), ornithine lipid (OL), an unidentified phospholipid (PL), and an unidentified aminolipid (AL) were the major polar lipids of all the strains. According to 16S rRNA gene sequences, all strains clustered phylogenetically with the only species of the genus Rhodothalassium (99.8–99.3% sequence similarity) but only strains JA325 and JA563 were distinctly related (60 + 1.5% DNA–DNA hybridization [DDH]) to the type strain Rhodothalassium salexigens DSM 2132T. However, the genotypic data of strains JA325 and JA563 was not supported because of a large number of phenotypic differences compared to the type strain, therefore, it is proposed that all five newly isolated strains were R. salexigens-like strains. In addition, phylogenetically, the Rhodothalassium clade represented a distinct lineage and formed a deep branch with less than 90% 16S rRNA gene sequence similarity to other orders of the Alphaproteobacteria, and characteristic phenotypic properties also distinguished these bacteria from other purple non-sulfur bacteria. Therefore, the novel family Rhodothalassiaceae fam. nov. and the novel order Rhodothalassiales ord. nov. are proposed for the distinct phyletic line represented by the genus Rhodothalassium.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.syapm.2012.09.003
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  • 3
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    Secondary metabolites from Calotropis procera (Aiton) (2010)
    Elsevier
    In:  Phytochemistry Letters, 3 (4). pp. 212-216.
    Details
    Publication Date: 2019-09-23
    Description: Three new metabolites, 5-hydroxy-3,7-dimethoxyflavone-4′-O-β-glucopyranoside (1), 2β,19-epoxy-3β,14β-dihydroxy-19-methoxy-5α-card-20(22)-enolide (4) and β-anhydroepidigitoxigenin-3β-O-glucopyranoside (5), along with two known compounds, uzarigenine (2) and β-anhydroepidigitoxigenin (3), were isolated from Calotropis procera (Asclepiadaceae). The structure elucidation was accomplished mainly by nuclear magnetic resonance (NMR) spectroscopic and mass spectrometric methods. To examine putative antimicrobial or cytotoxic activities, various bioassays were performed. Uzarigenine (2) demonstrated moderate cytotoxicity.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.phytol.2010.07.009
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  • 4
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    Occurrence and purification of the photoactive yellow protein of Ectothiorhodospira halophila (PYP) and of immunologically related proteins of Rhodospirillum salexigens and Chromatium salexigens and intracellular localization of PYP (1995)
    Elsevier
    In:  Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, 1253 (2). pp. 181-188.
    Details
    Publication Date: 2019-01-21
    Description: The photoactive yellow protein of Ectothiodospira halophila (PYP) was purified to homogeneity by an advanced method and applied as an affinity ligand for the isolation of an anti-PYP IgG fraction which was used for immunoscreening. The distribution of proteins immunologically related to PYP was investigated in protein fractions of 51 strains from 38 species of non-halophilic and halophilic phototrophic and chemotrophic eubacteria and archaeobacteria. Strong immunoreactive bands indicating the presence of authentic PYP on Western blots (apparent mass 17.8 kDa) was only found in the strains of E. halophila. Additionally, two soluble proteins of Chromatium salexigens and Rhodospirillum salexigens (apparent molecular masses 16.4 and 19 kDa, respectively) cross-reacted to approx. 6% and 4%. Analyses of cell fractions of E. halophila revealed that PYP is a cytoplasmic protein.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0167-4838(95)00160-9
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  • 5
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    Differentiation of Ectothiorhodospiraceae based on their fatty acid composition (1996)
    Elsevier
    In:  Systematic and Applied Microbiology, 19 (2). pp. 223-230.
    Details
    Publication Date: 2019-01-24
    Description: The fatty acid composition of 27 strains from 7 described Ectothiorhodospira species, including all type strains, were analyzed and compared using the “Microbial Identification System”. According to their ability to grow in media with 15% total salts and more or to require much lower salt concentrations the comparison of the strains was made in two different groups. The strains grown in the established standard medium for Ectothiorhodospira species at 15% and 25% (w/v) salinity formed four major clusters. Two of these enclosed strains of E. halophila, the others E. abdelmalekii (one strain) and E. halochloris (3 strains), respectively. Those strains with salt optima significantly below 10% (w/v) salinity formed three major clusters. The first included strains of E. mobilis and E. marismortui. The second cluster contained strains of E. shaposhnikovii, E. vacuolata and one strain that had been tentatively identified as E. mobilis but should be considered as a strain of E. shaposhnikovii. The third group contained strains that were assigned to E. mobilis but should be regarded as a separate and new species. The observed similarities support and extend patterns of relationships obtained by other taxonomic investigations on the basis of a smaller number of strains.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0723-2020(96)80048-8
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  • 6
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    New Pentaenes from the Sponge-Derived Marine Fungus Penicillium rugulosum: Structure Determination and Biosynthetic Studies (2007)
    Elsevier
    In:  Tetrahedron, 63 . pp. 11844-11849.
    Details
    Publication Date: 2017-12-05
    Description: Seven new fungal polyketides possessing linear pentaene structures ending in cyclic moieties were isolated from the mycelium extract of a marine sponge-derived Penicillium rugulosum. Feeding of C-13-labeled acetate and L-methionine was used to verify the polyketide origin of prugosene A1. It could also be shown that prugosenes B1 and C1 were formed from prugosene A1 by hydrolysis and decarboxylation of its oxabicyclo[2.2.1]heptane unit.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.tet.2007.09.025
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  • 7
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    Phylogenetic diversity and antimicrobial activities of bryozoan-associated bacteria isolated from Mediterranean and Baltic Sea habitats (2010)
    Elsevier
    In:  Systematic and Applied Microbiology, 33 . pp. 94-104.
    Details
    Publication Date: 2020-10-16
    Description: To date, only a small number of investigations covering microbe–bryozoa associations have been carried out. Most of them have focused on a few bryozoan species and none have covered the antibacterial activities of associated bacteria. In the current study, the proportion and phylogenetic classification of Bryozoan-associated bacteria with antimicrobial properties were investigated. Twenty-one specimens of 14 different bryozoan species were collected from several sites in the Baltic and the Mediterranean Sea. A total of 340 associated bacteria were isolated, and 101 displayed antibiotic activities. While antibiosis was predominantly directed against Gram-positive test strains, 16S rRNA gene sequencing revealed affiliation of the isolates to Gram-negative classes (Flavobacteria, Alpha- and Gammaproteobacteria). One isolate was related to the Gram-positive Actinobacteria. The sequences were grouped into 27 phylotypes on the basis of similarity values ≥99.5%. A host-specific affiliation was not revealed as members of the same phylotype were derived from different bryozoan species. Site-specific patterns, however, were demonstrated. Strains of the genera Sphingomonas and Alteromonas were exclusively isolated from Mediterranean sites, whereas Shewanella, Marinomonas and Vibrio-related isolates were only from Baltic sites. Although Pseudoalteromonas affiliated strains were found in both habitats, they were separated into respective phylotypes. Isolates with 16S rDNA similarity values 〈98%, which could possibly represent new species, belonged to the genera Shewanella, Pseudoalteromonas and Tenacibaculum.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.syapm.2009.12.002
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  • 8
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    Genus Rhodospira (2005)
    Springer Science + Business Media, Inc.
    In:  In: Bergey's Manual of Systematic Bacteriology: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. , ed. by Brenner, D. J., Krieg, N. R. and Staley, J. T. Springer Science + Business Media, Inc., New York, pp. 35-36. ISBN -10:0387-24145-0
    Details
    Publication Date: 2012-02-23
    Type: Book chapter , PeerReviewed
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  • 9
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    Genus 〈em〉Roseospirillum〈/em〉 (2005)
    Springer Science + Business Media, Inc.
    In:  In: Bergey's Manual of Systematic Bacteriology: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. , ed. by Brenner, D. J., Krieg, N. R. and Staley, J. T. Springer Science + Business Media, Inc., New York, 39 pp. 2 ISBN 978-0-387-24145-6
    Details
    Publication Date: 2012-02-23
    Type: Book chapter , PeerReviewed
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  • 10
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    Genus Rhodospirillum (2005)
    Springer Science + Business Media, Inc.
    In:  In: Bergey's Manual of Systematic Bacteriology: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. , ed. by Brenner, D. J., Krieg, N. R. and Staley, J. T. Springer Science + Business Media, Inc., New York, pp. 1-6. ISBN -10:0387-24145-0
    Details
    Publication Date: 2012-02-23
    Type: Book chapter , PeerReviewed
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