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Sun YY, Hu B, Yu HB, Zhou J, Meng XC, Ning Z, Ding JF, Cui MH, Liu XY. Genomics- and Transcriptomics-Guided Discovery of Clavatols from Arctic Fungi Penicillium sp. MYA5. Mar Drugs 2024; 22:236. [PMID: 38921547 PMCID: PMC11205228 DOI: 10.3390/md22060236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/15/2024] [Accepted: 05/20/2024] [Indexed: 06/27/2024] Open
Abstract
Clavatols exhibit a wide range of biological activities due to their diverse structures. A genome mining strategy identified an A5cla cluster from Penicillium sp. MYA5, derived from the Arctic plant Dryas octopetala, is responsible for clavatol biosynthesis. Seven clavatols, including one new clavatol derivate named penicophenone F (1) and six known clavatols (2-7), were isolated from Penicillium sp. MYA5 using a transcriptome mining strategy. These structures were elucidated by comprehensive spectroscopic analysis. Antibacterial, aldose reductase inhibition, and siderophore-producing ability assays were conducted on compounds 1-7. Compounds 1 and 2 demonstrated inhibitory effects on the ALR2 enzyme with inhibition rates of 75.3% and 71.6% at a concentration of 10 μM, respectively. Compound 6 exhibited antibacterial activity against Staphylococcus aureus and Escherichia coli with MIC values of 4.0 μg/mL and 4.0 μg/mL, respectively. Additionally, compounds 1, 5, and 6 also showed potential iron-binding ability.
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Affiliation(s)
- Yuan-Yuan Sun
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Bo Hu
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Hao-Bing Yu
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Jing Zhou
- Institute of Quality Inspection and Technical Research, Shanghai 200031, China;
| | - Xian-Chao Meng
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Zhe Ning
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Jin-Feng Ding
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Ming-Hui Cui
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
| | - Xiao-Yu Liu
- Naval Medical Center of PLA, Department of Marine Biomedicine and Polar Medicine, Naval Medical University, Shanghai 200433, China; (Y.-Y.S.); (B.H.); (H.-B.Y.); (X.-C.M.); (Z.N.); (J.-F.D.); (M.-H.C.)
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Jeong GJ, Khan F, Tabassum N, Jo DM, Jung WK, Kim YM. Roles of Pseudomonas aeruginosa siderophores in interaction with prokaryotic and eukaryotic organisms. Res Microbiol 2024:104211. [PMID: 38734157 DOI: 10.1016/j.resmic.2024.104211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 05/05/2024] [Accepted: 05/06/2024] [Indexed: 05/13/2024]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that produces two types of siderophores, pyoverdine and pyochelin, that play pivotal roles in iron scavenging from the environment and host cells. P. aeruginosa siderophores can serve as virulence factors and perform various functions. Several bacterial and fungal species are likely to interact with P. aeruginosa due to its ubiquity in soil and water as well as its potential to cause infections in plants, animals, and humans. Siderophores produced by P. aeruginosa play critical roles in iron scavenging for prokaryotic species (bacteria) and eukaryotic hosts (fungi, animals, insects, invertebrates, and plants) as well. This review provides a comprehensive discussion of the role of P. aeruginosa siderophores in interaction with prokaryotes and eukaryotes as well as their underlying mechanisms of action. The evolutionary relationship between P. aeruginosa siderophore recognition receptors, such as FpvA, FpvB, and FptA, and those of other bacterial species has also been investigated.
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Affiliation(s)
- Geum-Jae Jeong
- Department of Food Science and Technology, Pukyong National University, Busan 48513, Republic of Korea; Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea; Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, Republic of Korea
| | - Fazlurrahman Khan
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea; Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, Republic of Korea; Institute of Fisheries Science, Pukyong National University. Busan 48513, Republic of Korea; International Graduate Program of Fisheries Science, Pukyong National University, Busan 48513, Republic of Korea.
| | - Nazia Tabassum
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea; Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, Republic of Korea
| | - Du-Min Jo
- National Marine Biodiversity Institute of Korea, Seochun, Chungcheongnam-do, 33662, Republic of Korea
| | - Won-Kyo Jung
- Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea; Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, Republic of Korea; Major of Biomedical Engineering, Division of Smart Healthcare, College of Information Technology and Convergence and New-senior Healthcare Innovation Center (BK21 Plus), Pukyong National University, Busan, Republic of Korea
| | - Young-Mog Kim
- Department of Food Science and Technology, Pukyong National University, Busan 48513, Republic of Korea; Marine Integrated Biomedical Technology Center, The National Key Research Institutes in Universities, Pukyong National University, Busan, 48513, Republic of Korea; Research Center for Marine Integrated Bionics Technology, Pukyong National University, Busan 48513, Republic of Korea
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Inomata T, Endo S, Ido H, Miyamoto M, Ichikawa H, Sugita R, Ozawa T, Masuda H. Detection of Microorganisms Using Artificial Siderophore-Fe III Complex-Modified Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:2632-2645. [PMID: 38252152 DOI: 10.1021/acs.langmuir.3c03084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Four FeIII complexes of typical artificial siderophore ligands containing catecholate and/or hydroxamate groups of tricatecholate, biscatecholate-monohydroxamate, monocatecholate-bishydroxamate, and trihydroxamate type artificial siderophores (K3[FeIIILC3], K2[FeIIILC2H1], K[FeIIILC1H2], and [FeIIILH3]) were modified on Au substrate surfaces. Their abilities to adsorb microorganisms were investigated using scanning electron microscopy, quartz crystal microbalance, and AC impedance methods. The artificial siderophore-iron complexes modified on Au substrates (FeLC3/Au, FeLC2H1/Au, FeLC1H2/Au, and FeLH3/Au) showed the selective immobilization behavior for various microorganisms, depending on the structural features of the artificial siderophores (the number of catecholate and hydroxamate arms). Their specificities corresponded well with the structural characteristics of natural siderophores released by microorganisms and used for FeIII ion uptake. These findings suggest that they were generated via specific interactions between the artificial siderophore-FeIII complexes and the receptors on microorganism surfaces. Our observations revealed that the FeL/Au systems may be potentially used as effective microbe-capturing probes that can enable rapid and simple detection and identification of various microorganisms.
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Affiliation(s)
- Tomohiko Inomata
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Suguru Endo
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Hiroki Ido
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Masakazu Miyamoto
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Hiroki Ichikawa
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Ririka Sugita
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Tomohiro Ozawa
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Hideki Masuda
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
- Department of Applied Chemistry, Aichi Institute of Technology, 1247 Yachigusa, Yakusa-cho, Toyota 470-0392, Japan
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Petkov N, Tadjer A, Encheva E, Cherkezova-Zheleva Z, Paneva D, Stoyanova R, Kukeva R, Dorkov P, Pantcheva I. Experimental and DFT Study of Monensinate and Salinomycinate Complexes Containing {Fe 3(µ 3-O)} 7+ Core. Molecules 2024; 29:364. [PMID: 38257278 PMCID: PMC10818969 DOI: 10.3390/molecules29020364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/04/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
Two trinuclear oxo-centred iron(III) coordination compounds of monensic and salinomycinic acids (HL) were synthesized and their spectral properties were studied using physicochemical/thermal methods (FT-IR, TG-DTA, TG-MS, EPR, Mössbauer spectroscopy, powder XRD) and elemental analysis. The data suggested the formation of [Fe3(µ3-O)L3(OH)4] and the probable complex structures were modelled using the DFT method. The computed spectral parameters of the optimized constructs were compared to the experimentally measured ones. In each complex, three metal centres were joined together at the axial position by a μ3-O unit to form a {Fe3O}7+ core. The antibiotics monoanions served as bidentate ligands through the carboxylate and hydroxyl groups located at the termini. The carboxylate moieties played a dual role bridging each two metal centres. Hydroxide anions secured the overall neutral character of the coordination species. Mössbauer spectra displayed asymmetric quadrupole doublets that were consistent with the existence of two types of high-spin iron(III) sites with different environments-two Fe[O5] and one Fe[O6] centres. The solid-state EPR studies confirmed the +3 oxidation state of iron with a total spin St = 5/2 per trinuclear cluster. The studied complexes are the first iron(III) coordination compounds of monensin and salinomycin reported so far.
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Affiliation(s)
- Nikolay Petkov
- Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1164 Sofia, Bulgaria; (A.T.); (E.E.)
| | - Alia Tadjer
- Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1164 Sofia, Bulgaria; (A.T.); (E.E.)
| | - Elzhana Encheva
- Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1164 Sofia, Bulgaria; (A.T.); (E.E.)
- Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Zara Cherkezova-Zheleva
- Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (Z.C.-Z.); (D.P.)
| | - Daniela Paneva
- Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (Z.C.-Z.); (D.P.)
| | - Radostina Stoyanova
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (R.S.); (R.K.)
| | - Rositsa Kukeva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; (R.S.); (R.K.)
| | - Petar Dorkov
- Research and Development Department, Biovet Ltd., 4550 Peshtera, Bulgaria;
| | - Ivayla Pantcheva
- Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1164 Sofia, Bulgaria; (A.T.); (E.E.)
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Tian M, Li Z, Qu J, Fang T, Yin Y, Zuo D, Abdelgawad HA, Hu H, Wang S, Qi J, Wang G, Yu S. The novel LysR-family transcriptional regulator BvtR is involved in the resistance of Brucella abortus to nitrosative stress, detergents and virulence through the genetic regulation of diverse pathways. Vet Microbiol 2022; 267:109393. [PMID: 35259600 DOI: 10.1016/j.vetmic.2022.109393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 01/22/2022] [Accepted: 02/28/2022] [Indexed: 11/22/2022]
Abstract
Brucella is a facultative intracellular bacterium lacking classical virulence factors; its virulence instead depends on its ability to invade and proliferate within host cells. After entering cells, Brucella rapidly modulates the expression of a series of genes involved in metabolism and immune evasion. Here, a novel LysR-family transcriptional regulator, designated Brucellavirulence-related transcriptional regulator (BvtR), was found to be associated with Brucella abortus virulence. We first successfully constructed a BvtR mutant, ΔbvtR, and a complemented strain, ΔbvtR-Com. Subsequently, we performed cell infection experiments, which indicated that the ΔbvtR strain exhibited similar adhesion, invasion and survival within HeLa cells or RAW264.7 macrophages to those of the wild-type strain. In stress resistance tests, the ΔbvtR strain showed enhanced sensitivity to sodium nitroprusside and sodium dodecyl sulfate, but not to hydrogen peroxide, cumene hydroperoxide, polymyxin B and natural serum. Mouse infection experiments indicated that the virulence of the ΔbvtR strain significantly decreased at 4 weeks post-infection. Finally, we analyzed differentially expressed genes regulated by BvtR with RNA-seq, COG classification and KEGG pathway analysis. Nitrogen metabolism, siderophore biosynthesis and oligopeptide transport were found to be the predominantly altered functions, and key metabolic and regulatory networks were delineated in the ΔbvtR mutant. Thus, we identified a novel Brucella virulence-related regulator, BvtR, and demonstrated that BvtR regulation affects Brucella resistance to killing by sodium nitroprusside and sodium dodecyl sulfate. The differentially expressed genes responding to BvtR are involved in diverse functions or pathways in Brucella, thus, suggesting the breadth of BvtR's regulatory functions. This study provides novel clues regarding Brucella pathogenesis.
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Affiliation(s)
- Mingxing Tian
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Zichen Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Jing Qu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; Songjiang District Center for Animal Disease Control and Prevention, Shanghai 201699, China
| | - Tian Fang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China; College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Yi Yin
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Dong Zuo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Hosny Ahmed Abdelgawad
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Hai Hu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Shaohui Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Jingjing Qi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China
| | - Guijun Wang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Shengqing Yu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Shanghai 200241, China.
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Al Shaer DM, Albericio F, Torre BG. Synthesis of New Peptide‐Based Ligands with 1,2‐HOPO Pendant Chelators and Thermodynamic Evaluation of Their Iron(III) Complexes**. ChemistrySelect 2021. [DOI: 10.1002/slct.202102105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Danah M. Al Shaer
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP) School of Laboratory Medicine and Medical Sciences College of Health Sciences University of KwaZulu-Natal Durban 4041 South Africa
- Peptide Science Laboratory School of Chemistry and Physics University of KwaZulu-Natal Durban 4001 South Africa
| | - Fernando Albericio
- Peptide Science Laboratory School of Chemistry and Physics University of KwaZulu-Natal Durban 4001 South Africa
- Institute for Advanced Chemistry of Catalonia (IQAC-CSIC) 08034 Barcelona Spain
- CIBER-BBN Networking Centre on Bioengineering Biomaterials and Nanomedicine and Department of Organic Chemistry University of Barcelona 08028 Barcelona Spain
| | - Beatriz G. Torre
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP) School of Laboratory Medicine and Medical Sciences College of Health Sciences University of KwaZulu-Natal Durban 4041 South Africa
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Kuzyk SB, Hughes E, Yurkov V. Discovery of Siderophore and Metallophore Production in the Aerobic Anoxygenic Phototrophs. Microorganisms 2021; 9:microorganisms9050959. [PMID: 33946921 PMCID: PMC8146977 DOI: 10.3390/microorganisms9050959] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/20/2021] [Accepted: 04/28/2021] [Indexed: 11/16/2022] Open
Abstract
Aerobic anoxygenic phototrophs have been isolated from a rich variety of environments including marine ecosystems, freshwater and meromictic lakes, hypersaline springs, and biological soil crusts, all in the hopes of understanding their ecological niche. Over 100 isolates were chosen for this study, representing 44 species from 27 genera. Interactions with Fe3+ and other metal(loid) cations such as Mg2+, V3+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Se4+ and Te2+ were tested using a chromeazurol S assay to detect siderophore or metallophore production, respectively. Representatives from 20 species in 14 genera of α-Proteobacteria, or 30% of strains, produced highly diffusible siderophores that could bind one or more metal(loid)s, with activity strength as follows: Fe > Zn > V > Te > Cu > Mn > Mg > Se > Ni > Co. In addition, γ-proteobacterial Chromocurvus halotolerans, strain EG19 excreted a brown compound into growth medium, which was purified and confirmed to act as a siderophore. It had an approximate size of ~341 Da and drew similarities to the siderophore rhodotorulic acid, a member of the hydroxamate group, previously found only among yeasts. This study is the first to discover siderophore production to be widespread among the aerobic anoxygenic phototrophs, which may be another key method of metal(loid) chelation and potential detoxification within their environments.
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Hydroxamate siderophores: Natural occurrence, chemical synthesis, iron binding affinity and use as Trojan horses against pathogens. Eur J Med Chem 2020; 208:112791. [DOI: 10.1016/j.ejmech.2020.112791] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/23/2020] [Accepted: 08/24/2020] [Indexed: 12/11/2022]
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Petrik M, Umlaufova E, Raclavsky V, Palyzova A, Havlicek V, Pfister J, Mair C, Novy Z, Popper M, Hajduch M, Decristoforo C. 68Ga-labelled desferrioxamine-B for bacterial infection imaging. Eur J Nucl Med Mol Imaging 2020; 48:372-382. [PMID: 32734456 PMCID: PMC7835195 DOI: 10.1007/s00259-020-04948-y] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 06/29/2020] [Indexed: 12/21/2022]
Abstract
Purpose With the increase of especially hospital-acquired infections, timely and accurate diagnosis of bacterial infections is crucial for effective patient care. Molecular imaging has the potential for specific and sensitive detection of infections. Siderophores are iron-specific chelators recognized by specific bacterial transporters, representing one of few fundamental differences between bacterial and mammalian cells. Replacing iron by gallium-68 without loss of bioactivity is possible allowing molecular imaging by positron emission tomography (PET). Here, we report on the preclinical evaluation of the clinically used siderophore, desferrioxamine-B (Desferal®, DFO-B), radiolabelled with 68Ga for imaging of bacterial infections. Methods In vitro characterization of [68Ga]Ga-DFO-B included partition coefficient, protein binding and stability determination. Specific uptake of [68Ga]Ga-DFO-B was tested in vitro in different microbial cultures. In vivo biodistribution was studied in healthy mice and dosimetric estimation for human setting performed. PET/CT imaging was carried out in animal infection models, representing the most common pathogens. Results DFO-B was labelled with 68Ga with high radiochemical purity and displayed hydrophilic properties, low protein binding and high stability in human serum and PBS. The high in vitro uptake of [68Ga]Ga-DFO-B in selected strains of Pseudomonas aeruginosa, Staphylococcus aureus and Streptococcus agalactiae could be blocked with an excess of iron-DFO-B. [68Ga]Ga-DFO-B showed rapid renal excretion and minimal retention in blood and other organs in healthy mice. Estimated human absorbed dose was 0.02 mSv/MBq. PET/CT images of animal infection models displayed high and specific accumulation of [68Ga]Ga-DFO-B in both P. aeruginosa and S. aureus infections with excellent image contrast. No uptake was found in sterile inflammation, heat-inactivated P. aeruginosa or S. aureus and Escherichia coli lacking DFO-B transporters. Conclusion DFO-B can be easily radiolabelled with 68Ga and displayed suitable in vitro characteristics and excellent pharmacokinetics in mice. The high and specific uptake of [68Ga]Ga-DFO-B by P. aeruginosa and S. aureus was confirmed both in vitro and in vivo, proving the potential of [68Ga]Ga-DFO-B for specific imaging of bacterial infections. As DFO-B is used in clinic for many years and the estimated radiation dose is lower than for other 68Ga-labelled radiopharmaceuticals, we believe that [68Ga]Ga-DFO-B has a great potential for clinical translation. Electronic supplementary material The online version of this article (10.1007/s00259-020-04948-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Milos Petrik
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-77900, Olomouc, Czech Republic.
| | - Eva Umlaufova
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-77900, Olomouc, Czech Republic
| | - Vladislav Raclavsky
- Department of Microbiology, Faculty of Medicine and Dentistry, Palacky University and University Hospital, Olomouc, Czech Republic
| | - Andrea Palyzova
- Institute of Microbiology of the Czech Academy of Sciences v.v.i., Prague, Czech Republic
| | - Vladimir Havlicek
- Institute of Microbiology of the Czech Academy of Sciences v.v.i., Prague, Czech Republic.,Department of Analytical Chemistry, Faculty of Science, Palacky University, Olomouc, Czech Republic
| | - Joachim Pfister
- Department of Nuclear Medicine, Medical University Innsbruck, Anichstrasse 5, A-6020, Innsbruck, Austria
| | - Christian Mair
- Department of Nuclear Medicine, Medical University Innsbruck, Anichstrasse 5, A-6020, Innsbruck, Austria
| | - Zbynek Novy
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-77900, Olomouc, Czech Republic
| | - Miroslav Popper
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-77900, Olomouc, Czech Republic
| | - Marian Hajduch
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, CZ-77900, Olomouc, Czech Republic
| | - Clemens Decristoforo
- Department of Nuclear Medicine, Medical University Innsbruck, Anichstrasse 5, A-6020, Innsbruck, Austria.
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Mamo G, Mattiasson B. Alkaliphiles: The Versatile Tools in Biotechnology. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2020; 172:1-51. [PMID: 32342125 DOI: 10.1007/10_2020_126] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The extreme environments within the biosphere are inhabited by organisms known as extremophiles. Lately, these organisms are attracting a great deal of interest from researchers and industrialists. The motive behind this attraction is mainly related to the desire for new and efficient products of biotechnological importance and human curiosity of understanding nature. Organisms living in common "human-friendly" environments have served humanity for a very long time, and this has led to exhaustion of the low-hanging "fruits," a phenomenon witnessed by the diminishing rate of new discoveries. For example, acquiring novel products such as drugs from the traditional sources has become difficult and expensive. Such challenges together with the basic research interest have brought the exploration of previously neglected or unknown groups of organisms. Extremophiles are among these groups which have been brought to focus and garnering a growing importance in biotechnology. In the last few decades, numerous extremophiles and their products have got their ways into industrial, agricultural, environmental, pharmaceutical, and other biotechnological applications.Alkaliphiles, organisms which thrive optimally at or above pH 9, are one of the most important classes of extremophiles. To flourish in their extreme habitats, alkaliphiles evolved impressive structural and functional adaptations. The high pH adaptation gave unique biocatalysts that are operationally stable at elevated pH and several other novel products with immense biotechnological application potential. Advances in the cultivation techniques, success in gene cloning and expression, metabolic engineering, metagenomics, and other related techniques are significantly contributing to expand the application horizon of these remarkable organisms of the 'bizarre' world. Studies have shown the enormous potential of alkaliphiles in numerous biotechnological applications. Although it seems just the beginning, some fantastic strides are already made in tapping this potential. This work tries to review some of the prominent applications of alkaliphiles by focusing such as on their enzymes, metabolites, exopolysaccharides, and biosurfactants. Moreover, the chapter strives to assesses the whole-cell applications of alkaliphiles including in biomining, food and feed supplementation, bioconstruction, microbial fuel cell, biofuel production, and bioremediation.
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Affiliation(s)
| | - Bo Mattiasson
- Department of Biotechnology, Lund University, Lund, Sweden
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11
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Csire G, Canabady-Rochelle L, Averlant-Petit MC, Selmeczi K, Stefan L. Both metal-chelating and free radical-scavenging synthetic pentapeptides as efficient inhibitors of reactive oxygen species generation. Metallomics 2020; 12:1220-1229. [DOI: 10.1039/d0mt00103a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The very first Fe(iii)-peptide chelators exhibiting antioxidant properties thanks to an unprecedented dual direct/indirect mode of action.
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Affiliation(s)
| | | | | | | | - Loic Stefan
- Université de Lorraine
- CNRS
- LCPM
- F-54000 Nancy
- France
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12
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Challenges and Adaptations of Life in Alkaline Habitats. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2019; 172:85-133. [DOI: 10.1007/10_2019_97] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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13
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Imaging of Pseudomonas aeruginosa infection with Ga-68 labelled pyoverdine for positron emission tomography. Sci Rep 2018; 8:15698. [PMID: 30356077 PMCID: PMC6200719 DOI: 10.1038/s41598-018-33895-w] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 10/08/2018] [Indexed: 01/05/2023] Open
Abstract
Pseudomonas aeruginosa is an increasingly prevalent opportunistic pathogen that causes a variety of life-threatening nosocomial infections. Novel strategies for the development of new antibacterial treatments as well as diagnostic tools are needed. One of the novel diagnostic strategies for the detection of infection could be the utilization of siderophores. Siderophores are low-molecular-weight chelators produced by microbes to scavenge essential iron. Replacing iron in siderophores by suitable radiometals, such as Ga-68 for positron emission tomography (PET) imaging, opens approaches for targeted imaging of infection. Here we report on pyoverdine PAO1 (PVD-PAO1), a siderophore produced by P. aeruginosa, labelled with Ga-68 for specific imaging of Pseudomonas infections. PVD-PAO1 was labelled with Ga-68 with high radiochemical purity. The resulting complex showed hydrophilic properties, low protein binding and high stability in human serum. In vitro uptake of 68Ga-PVD-PAO1 was highly dependent on the type of microbial culture. In normal mice 68Ga-PVD-PAO1 showed rapid pharmacokinetics with urinary excretion. PET imaging in infected animals displayed specific accumulation of 68Ga-PVD-PAO1 in infected tissues and better distribution than clinically used 18F-fluorodeoxyglucose (18F-FDG) and 68Ga-citrate. Ga-68 labelled pyoverdine PAO1 seems to be a promising agent for imaging of P. aeruginosa infections by means of PET.
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14
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Isolation and identification of siderophores produced by cyanobacteria. Folia Microbiol (Praha) 2018; 63:569-579. [DOI: 10.1007/s12223-018-0626-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 06/12/2018] [Indexed: 01/05/2023]
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15
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Nonribosomal peptides for iron acquisition: pyochelin biosynthesis as a case study. Curr Opin Struct Biol 2018; 53:1-11. [PMID: 29455106 DOI: 10.1016/j.sbi.2018.01.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 01/25/2018] [Accepted: 01/29/2018] [Indexed: 01/03/2023]
Abstract
Microbes synthesize small, iron-chelating molecules known as siderophores to acquire iron from the environment. One way siderophores are generated is by nonribosomal peptide synthetases (NRPSs). The bioactive peptides generated by NRPS enzymes have unique chemical features, which are incorporated by accessory and tailoring domains or proteins. The first part of this review summarizes recent progress in NRPS structural biology. The second part uses the biosynthesis of pyochelin, a siderophore from Pseudomonas aeruginosa, as a case study to examine enzymatic methods for generating the observed diversity in NRPS-derived natural products.
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16
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Zhang S, De Leon Rodriguez LM, Huang R, Leung IKH, Harris PWR, Brimble MA. Total synthesis of the proposed structure of talarolide A. Org Biomol Chem 2018; 16:5286-5293. [DOI: 10.1039/c8ob01230j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The proposed structure of talarolide A, a cycloheptapeptide featuring a hydroxamate moiety within the peptide backbone, was successfully synthesized.
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Affiliation(s)
- Shengping Zhang
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
| | | | - Renjie Huang
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
| | | | - Paul W. R. Harris
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery
| | - Margaret A. Brimble
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery
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17
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Synthesis, iron(III) complexation properties, molecular dynamics simulations and P. aeruginosa siderophore-like activity of two pyoverdine analogs. Eur J Med Chem 2017; 137:338-350. [DOI: 10.1016/j.ejmech.2017.06.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/02/2017] [Accepted: 06/05/2017] [Indexed: 11/23/2022]
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18
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Awad R, Gans P, Reiser JB. Structural insights into the substrate recognition and reaction specificity of the PLP-dependent fold-type I isoleucine 2-epimerase from Lactobacillus buchneri. Biochimie 2017; 137:165-173. [DOI: 10.1016/j.biochi.2017.03.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 02/02/2017] [Accepted: 03/21/2017] [Indexed: 02/02/2023]
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19
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Drewniak Ł, Skłodowska A, Manecki M, Bajda T. Solubilization of Pb-bearing apatite Pb 5(PO 4) 3Cl by bacteria isolated from polluted environment. CHEMOSPHERE 2017; 171:302-307. [PMID: 28027474 DOI: 10.1016/j.chemosphere.2016.12.056] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Revised: 12/04/2016] [Accepted: 12/11/2016] [Indexed: 06/06/2023]
Abstract
The main purpose of this study was to test if microorganisms isolated from heavily polluted environments can enhance dissolution of Pb-apatite (pyromorphite) resulting in remobilization of lead. Three bacterial strains belonging to the genus Pseudomonas isolated from underground mines in SW Poland were used in batch experiments of pyromorphite solubilization carried out in phosphate reach and phosphate poor media. Bacteria growth and evolution of Pb and phosphate concentrations as well as pH were determined. Additionally the concentration of bacterial siderophores in leaching solution was assayed. All bacterial strains were able to grow in both media in the presence of pyromorphite. The number of bacterial cells was from one to two orders of magnitude higher in the phosphate rich media. In the phosphate poor media the only source of P was the dissolving lead apatite. Bacteria enhanced the solubility of pyromorphite resulting in elevated Pb concentrations, up to 853 μg L-1 in phosphate-rich medium and 6112 μg L-1 in phosphate-poor medium, compared to less than 100 μg L-1 in an abiotic control sample. Production of siderophores was characteristic for each culture and was much lower (10-1000 fold) in the phosphate-poor medium. This study demonstrates for the first time that indigenous bacteria can directly and indirectly promote the mobilization of lead from pyromorphite. This phenomenon should be considered in long term risk assessment of Pb contaminated soils after reclamation processes because bacteria can play a significant role in the efficiency of clean-up efforts and overall geochemical cycling of Pb.
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Affiliation(s)
- Łukasz Drewniak
- Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Aleksandra Skłodowska
- Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Maciej Manecki
- Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
| | - Tomasz Bajda
- Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland.
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20
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O'Neill EC, Trick M, Hill L, Rejzek M, Dusi RG, Hamilton CJ, Zimba PV, Henrissat B, Field RA. The transcriptome of Euglena gracilis reveals unexpected metabolic capabilities for carbohydrate and natural product biochemistry. MOLECULAR BIOSYSTEMS 2016; 11:2808-20. [PMID: 26289754 DOI: 10.1039/c5mb00319a] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Euglena gracilis is a highly complex alga belonging to the green plant line that shows characteristics of both plants and animals, while in evolutionary terms it is most closely related to the protozoan parasites Trypanosoma and Leishmania. This well-studied organism has long been known as a rich source of vitamins A, C and E, as well as amino acids that are essential for the human diet. Here we present de novo transcriptome sequencing and preliminary analysis, providing a basis for the molecular and functional genomics studies that will be required to direct metabolic engineering efforts aimed at enhancing the quality and quantity of high value products from E. gracilis. The transcriptome contains over 30,000 protein-encoding genes, supporting metabolic pathways for lipids, amino acids, carbohydrates and vitamins, along with capabilities for polyketide and non-ribosomal peptide biosynthesis. The metabolic and environmental robustness of Euglena is supported by a substantial capacity for responding to biotic and abiotic stress: it has the capacity to deploy three separate pathways for vitamin C (ascorbate) production, as well as producing vitamin E (α-tocopherol) and, in addition to glutathione, the redox-active thiols nor-trypanothione and ovothiol.
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Affiliation(s)
- Ellis C O'Neill
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK.
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21
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Evaluation of Stress-Induced Microbial Siderophore from Pseudomonas aeruginosa Strain S1 as a Potential Matrix Metalloproteinase Inhibitor in Wound Healing Applications. Curr Microbiol 2016; 72:583-8. [PMID: 26804794 DOI: 10.1007/s00284-016-0988-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 12/08/2015] [Indexed: 10/22/2022]
Abstract
Matrix metalloproteinases (MMPs) are zinc-dependent proteolytic enzymes capable of causing various inflammatory and various degenerative diseases if over-expressed. The active site of these enzymes is a zinc binding motif which binds to the specific site on the substrate and induce degradation. Hence an inhibitor is required to form a complex with zinc motif which hampers the binding ability of MMPs. To obtain novel MMPs inhibitor for wound healing, the chelating activity of siderophore from the microbial source was focused. During screening for siderophore production, strain S1 produced the highest amount of siderophore in the minimal salts medium. The isolate was confirmed as Pseudomonas aeruginosa strain S1 based on 16S rRNA gene sequencing and phylogenetic analysis. The activity of the siderophore was assayed using chrome azurol sulphonate and purified by the chromatographic techniques. The structural evidence through Fourier transform infrared and nuclear magnetic resonance spectra revealed that the isolated siderophore is a catecholate type with the distinctive characters. The positive results of calcein and fluozin-3 assays indicate that siderophore could bind to divalent metal ions, namely Fe(2+) and Zn(2+). As the siderophore compound focused on wound healing property, the in vitro studies revealed the viability of NH3T3 fibroblast cells and its efficiency in matrix modulating was confirmed through gelatin zymogram.
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22
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Alex A, Antunes A. Whole Genome Sequencing of the Symbiont Pseudovibrio sp. from the Intertidal Marine Sponge Polymastia penicillus Revealed a Gene Repertoire for Host-Switching Permissive Lifestyle. Genome Biol Evol 2015; 7:3022-32. [PMID: 26519859 PMCID: PMC5635592 DOI: 10.1093/gbe/evv199] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Sponges harbor a complex consortium of microbial communities living in symbiotic relationship benefiting each other through the integration of metabolites. The mechanisms influencing a successful microbial association with a sponge partner are yet to be fully understood. Here, we sequenced the genome of Pseudovibrio sp. POLY-S9 strain isolated from the intertidal marine sponge Polymastia penicillus sampled from the Atlantic coast of Portugal to identify the genomic features favoring the symbiotic relationship. The draft genome revealed an exceptionally large genome size of 6.6 Mbp compared with the previously reported genomes of the genus Pseudovibrio isolated from a coral and a sponge larva. Our genomic study detected the presence of several biosynthetic gene clusters—polyketide synthase, nonribosomal peptide synthetase and siderophore—affirming the potential ability of the genus Pseudovibrio to produce a wide variety of metabolic compounds. Moreover, we identified a repertoire of genes encoding adaptive symbioses factors (eukaryotic-like proteins), such as the ankyrin repeats, tetratrico peptide repeats, and Sel1 repeats that improve the attachment to the eukaryotic hosts and the avoidance of the host’s immune response. The genome also harbored a large number of mobile elements (∼5%) and gene transfer agents, which explains the massive genome expansion and suggests a possible mechanism of horizontal gene transfer. In conclusion, the genome of POLY-S9 exhibited an increase in size, number of mobile DNA, multiple metabolite gene clusters, and secretion systems, likely to influence the genome diversification and the evolvability.
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Affiliation(s)
- Anoop Alex
- CIMAR/CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
| | - Agostinho Antunes
- CIMAR/CIIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal
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23
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Affiliation(s)
- Suman Kumar Maity
- Schulich
Faculty of Chemistry Technion—Israel Institute of Technology, 3200008 Haifa, Israel
| | - Shimrit Ohayon
- Schulich
Faculty of Chemistry Technion—Israel Institute of Technology, 3200008 Haifa, Israel
| | - Ashraf Brik
- Schulich
Faculty of Chemistry Technion—Israel Institute of Technology, 3200008 Haifa, Israel
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24
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Influence of Various Levels of Iron and Other Abiotic Factors on Siderophorogenesis in Paddy Field Cyanobacterium Anabaena oryzae. Appl Biochem Biotechnol 2015; 176:372-86. [DOI: 10.1007/s12010-015-1581-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 03/12/2015] [Indexed: 10/23/2022]
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25
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Molina CA, Vilchez S. Cooperation and bacterial pathogenicity: an approach to social evolution. REVISTA CHILENA DE HISTORIA NATURAL 2014. [DOI: 10.1186/s40693-014-0014-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Chen J, Campos J, Mercado BQ, Crabtree RH, Balcells D. Distortional Effects of Noncovalent Interactions in the Crystal Lattice of a Cp*Ir(III) Acylhydroxamic Acid Complex: A Joint Experimental–Computational Study. Organometallics 2014. [DOI: 10.1021/om500625c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jeffrey Chen
- Department
of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Jesús Campos
- Department
of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Brandon Q. Mercado
- Department
of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Robert H. Crabtree
- Department
of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - David Balcells
- Centre
of Excellence for Theoretical and Computational Chemistry (CTCC),
Department of Chemistry, University of Oslo, Oslo, 0315 Norway
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27
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Goto Y, Ito Y, Kato Y, Tsunoda S, Suga H. One-pot synthesis of azoline-containing peptides in a cell-free translation system integrated with a posttranslational cyclodehydratase. ACTA ACUST UNITED AC 2014; 21:766-74. [PMID: 24856821 DOI: 10.1016/j.chembiol.2014.04.008] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Revised: 03/26/2014] [Accepted: 04/16/2014] [Indexed: 10/25/2022]
Abstract
Azoline moieties in the backbones of peptidic natural products are important structural motifs that contribute to diverse bioactivities. Some azoline-containing peptides (Az-peptides) are produced from ribosomally synthesized precursor peptides, in which cysteine, serine, and threonine residues are converted to their corresponding azolines by posttranslational modification through a cyclodehydratase. We have devised an in vitro biosynthesis system of Az-peptides, referred to as the FIT-PatD (flexible in vitro translation) system, by the integration of a cell-free translation system with the posttranslational cyclodehydratase PatD. This system enabled the "one-pot" synthesis of a wide variety of Az-peptide derivatives expressed from synthetic DNA templates. The FIT-PatD system also facilitated mutagenesis studies on a wide array of precursor peptide sequences, unveiling unique in vitro substrate tolerance of PatD.
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Affiliation(s)
- Yuki Goto
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan; JST, PRESTO, Tokyo 113-0033, Japan.
| | - Yumi Ito
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yasuharu Kato
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
| | - Shotaro Tsunoda
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
| | - Hiroaki Suga
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan; JST, CREST, Tokyo 113-0033, Japan.
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28
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Khalil F, Franzmann E, Ramcke J, Dakischew O, Lips KS, Reinhardt A, Heisig P, Maison W. Biomimetic PEG-catecholates for stabile antifouling coatings on metal surfaces: Applications on TiO2 and stainless steel. Colloids Surf B Biointerfaces 2014; 117:185-92. [DOI: 10.1016/j.colsurfb.2014.02.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 02/04/2014] [Accepted: 02/12/2014] [Indexed: 12/24/2022]
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29
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Racemization in reverse: evidence that D-amino acid toxicity on Earth is controlled by bacteria with racemases. PLoS One 2014; 9:e92101. [PMID: 24647559 PMCID: PMC3960212 DOI: 10.1371/journal.pone.0092101] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 02/17/2014] [Indexed: 11/19/2022] Open
Abstract
D-amino acids are toxic for life on Earth. Yet, they form constantly due to geochemical racemization and bacterial growth (the cell walls of which contain D-amino acids), raising the fundamental question of how they ultimately are recycled. This study provides evidence that bacteria use D-amino acids as a source of nitrogen by running enzymatic racemization in reverse. Consequently, when soils are inundated with racemic amino acids, resident bacteria consume D- as well as L-enantiomers, either simultaneously or sequentially depending on the level of their racemase activity. Bacteria thus protect life on Earth by keeping environments D-amino acid free.
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30
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Fuller SJ, McMillan DGG, Renz MB, Schmidt M, Burke IT, Stewart DI. Extracellular electron transport-mediated Fe(III) reduction by a community of alkaliphilic bacteria that use flavins as electron shuttles. Appl Environ Microbiol 2014; 80:128-37. [PMID: 24141133 PMCID: PMC3910996 DOI: 10.1128/aem.02282-13] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 10/09/2013] [Indexed: 11/20/2022] Open
Abstract
The biochemical and molecular mechanisms used by alkaliphilic bacterial communities to reduce metals in the environment are currently unknown. We demonstrate that an alkaliphilic (pH > 9) consortium dominated by Tissierella, Clostridium, and Alkaliphilus spp. is capable of using iron (Fe(3+)) as a final electron acceptor under anaerobic conditions. Iron reduction is associated with the production of a freely diffusible species that, upon rudimentary purification and subsequent spectroscopic, high-performance liquid chromatography, and electrochemical analysis, has been identified as a flavin species displaying properties indistinguishable from those of riboflavin. Due to the link between iron reduction and the onset of flavin production, it is likely that riboflavin has an import role in extracellular metal reduction by this alkaliphilic community.
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Affiliation(s)
- Samuel J. Fuller
- School of Civil Engineering, University of Leeds, Leeds, United Kingdom
| | | | - Marc B. Renz
- University Hospital Jena, Friedrich-Schiller University, Jena, Germany
| | - Martin Schmidt
- University Hospital Jena, Friedrich-Schiller University, Jena, Germany
| | - Ian T. Burke
- School of Earth and Environment, University of Leeds, Leeds, United Kingdom
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31
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Miljković D, Spasojević I. Multiple sclerosis: molecular mechanisms and therapeutic opportunities. Antioxid Redox Signal 2013; 19:2286-334. [PMID: 23473637 PMCID: PMC3869544 DOI: 10.1089/ars.2012.5068] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Revised: 02/09/2012] [Accepted: 03/09/2013] [Indexed: 12/15/2022]
Abstract
The pathophysiology of multiple sclerosis (MS) involves several components: redox, inflammatory/autoimmune, vascular, and neurodegenerative. All of them are supported by the intertwined lines of evidence, and none of them should be written off. However, the exact mechanisms of MS initiation, its development, and progression are still elusive, despite the impressive pace by which the data on MS are accumulating. In this review, we will try to integrate the current facts and concepts, focusing on the role of redox changes and various reactive species in MS. Knowing the schedule of initial changes in pathogenic factors and the key turning points, as well as understanding the redox processes involved in MS pathogenesis is the way to enable MS prevention, early treatment, and the development of therapies that target specific pathophysiological components of the heterogeneous mechanisms of MS, which could alleviate the symptoms and hopefully stop MS. Pertinent to this, we will outline (i) redox processes involved in MS initiation; (ii) the role of reactive species in inflammation; (iii) prooxidative changes responsible for neurodegeneration; and (iv) the potential of antioxidative therapy.
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Affiliation(s)
- Djordje Miljković
- Department of Immunology, Institute for Biological Research “Siniša Stanković,” University of Belgrade, Belgrade, Serbia
| | - Ivan Spasojević
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia
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32
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Inomata T, Tanabashi H, Funahashi Y, Ozawa T, Masuda H. Adsorption and detection of Escherichia coli using an Au substrate modified with a catecholate-type artificial siderophore-Fe3+ complex. Dalton Trans 2013; 42:16043-8. [PMID: 23942789 DOI: 10.1039/c3dt51448j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A catecholate-type artificial siderophore with a terminal-NH2 group (1) and its Fe(3+) complex (2) were prepared. Siderophore 1 was characterized by (1)H NMR, FT-IR, and ESI-TOF MS spectroscopy. The corresponding Fe(3+) complex 2 was obtained by reaction of 1 with Fe(acac)3. The absorption band at 500 nm (ε = 4670 M(-1) cm(-1) at pH 7.0) of the electronic absorption spectrum of 2 is assignable as the LMCT (O(catecholate) → Fe(3+)) absorption band. This band indicates the formation of the Fe(3+) complex of 1. The biological activity of 2 with respect to Escherichia coli was clearly confirmed by observing that it permeates into the cell membrane. The self-assembled monolayer of 2 on an Au substrate, 2/Au, was prepared and its preparation was confirmed by FT-IR reflection-absorption spectroscopy (IR-RAS) and cyclic voltammetry (CV). Furthermore, a quartz crystal microbalance (QCM) chip modified with 2 effectively adsorbed E. coli. M. flavescens, an organism which is incapable of synthesizing siderophores and must therefore use exogenous hydroxamate-type siderophores for growth, did not adsorb on 2/Au. In contrast, E. coli did not adsorb on the hydroxamate-type artificial siderophore-Fe(3+) complex (3)-modified Au substrate, 3/Au. These results provide preliminary evidence that microbes recognized Fe(3+) ion-bound siderophores on the surface. The detection limit of 2/Au was ∼10(4) CFU mL(-1).
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Affiliation(s)
- Tomohiko Inomata
- Department of Material Science, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan.
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33
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Synthesis and functional analysis of deferriferrichrysin derivatives: Application to colorimetric pH indicators. Bioorg Med Chem 2013; 21:4296-300. [DOI: 10.1016/j.bmc.2013.04.078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 04/23/2013] [Accepted: 04/24/2013] [Indexed: 11/17/2022]
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34
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Affiliation(s)
- Roi Mashiach
- Department of Chemistry and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er-Sheva 84105, Israel
| | - Michael M. Meijler
- Department of Chemistry and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Be’er-Sheva 84105, Israel
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35
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The first promoter for conditional gene expression in Acremonium chrysogenum: Iron starvation-inducible mir1P. J Biotechnol 2013; 163:77-80. [DOI: 10.1016/j.jbiotec.2012.10.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 10/10/2012] [Accepted: 10/12/2012] [Indexed: 11/20/2022]
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de Los Santos-Villalobos S, Barrera-Galicia GC, Miranda-Salcedo MA, Peña-Cabriales JJ. Burkholderia cepacia XXVI siderophore with biocontrol capacity against Colletotrichum gloeosporioides. World J Microbiol Biotechnol 2012; 28:2615-23. [PMID: 22806187 DOI: 10.1007/s11274-012-1071-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Accepted: 04/23/2012] [Indexed: 11/27/2022]
Abstract
Colletotrichum gloeosporioides is the causal agent of anthracnose in mango. Burkholderia cepacia XXVI, isolated from mango rhizosphere and identified by 16S rDNA sequencing as a member of B. cepacia complex, was more effective than 6 other mango rhizosphere bacteria in inhibiting the model mango pathogen, C. gloeosporioides ATCC MYA 456. Biocontrol of this pathogen was demonstrated on Petri-dishes containing PDA by > 90 % reduction of surface colonization. The nature of the biocontrol metabolite(s) was characterized via a variety of tests. The inhibition was almost exclusively due to production of agar-diffusible, not volatile, metabolite(s). The diffusible metabolite(s) underwent thermal degradation at 70 and 121 °C (1 atm). Tests for indole acetic acid production and lytic enzyme activities (cellulase, glucanase and chitinase) by B. cepacia XXVI were negative, indicating that these metabolites were not involved in the biocontrol effect. Based on halo formation and growth inhibition of the pathogen on the diagnostic medium, CAS-agar, as well as colorimetric tests we surmised that strain XXVI produced a hydroxamate siderophore involved in the biocontrol effect observed. The minimal inhibitory concentration test showed that 0.64 μg ml(-1) of siderophore (Deferoxamine mesylate salt-equivalent) was sufficient to achieve 91.1 % inhibition of the pathogen growth on Petri-dishes containing PDA. The biocontrol capacity against C. gloeosporioides ATCC MYA 456 correlated directly with the siderophore production by B. cepacia XXVI: the highest concentration of siderophore production in PDB on day 7, 1.7 μg ml(-1) (Deferoxamine mesylate salt-equivalent), promoted a pathogen growth inhibition of 94.9 %. The growth of 5 additional strains of C. gloeosporioides (isolated from mango "Ataulfo" orchards located in the municipality of Chahuites, State of Oaxaca in Mexico) was also inhibited when confronted with B. cepacia XXVI. Results indicate that B. cepacia XXVI or its siderophore have the potential to be used as a biological control agent against C. gloeosporioides; thus diminishing environmental problems caused by the current practices to control this disease.
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Ignjatović A, Stević Z, Lavrnić D, Nikolić-Kokić A, Blagojević D, Spasić M, Spasojević I. Inappropriately chelated iron in the cerebrospinal fluid of amyotrophic lateral sclerosis patients. ACTA ACUST UNITED AC 2012; 13:357-62. [DOI: 10.3109/17482968.2012.665929] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Inomata T, Eguchi H, Funahashi Y, Ozawa T, Masuda H. Adsorption behavior of microbes on a QCM chip modified with an artificial siderophore-Fe3+ complex. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1611-1617. [PMID: 22182317 DOI: 10.1021/la203250n] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Three hydroxamate-type artificial siderophores with terminal NH(2) groups, tris[2-{3-(N-acyl-N-hydroxamino)propylamido}propyl]aminomethane (1-3, acyl-R group = Me, Et, and Ph, respectively), and their Fe(3+) complexes, 4-6, were prepared. The stability constant (log β) of 4 was estimated to be about 31 by its EDTA titration. The biological activities of 4-6 for Microbacterium flavescens, which is a hydroxamate-type siderophore, auxotrophic gram-positive microbe, clearly indicated that they permeated the cell membrane depending on their terminal bulky acyl-R groups. These artificial siderophore complexes, 4-6, were modified on Au electrode surfaces with the terminal NH(2) group (4-6/Au). The surface modification of 4-6 was confirmed by several electrochemical measurements. The quartz crystal microbalance (QCM) chips were also modified with 4-6. Microbe adsorption measurements using these modified QCM chips for M. flavescens, Pseudomonas putida, and Eschrichia coli were performed. The QCM chips have the ability to adsorb microbes selectively as a result of the differences in the interactions between the structures of Fe(3+)-artificial siderophore complexes and their receptors or binding proteins within the cell membrane.
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Affiliation(s)
- Tomohiko Inomata
- Department of Material Science, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
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Choi D, Sesham R, Kim Y, Angel LA. Analysis of methanobactin from Methylosinus trichosporium OB3b via ion mobility mass spectrometry. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2012; 18:509-520. [PMID: 23654196 DOI: 10.1255/ejms.1202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Methanobactins (mbs) are Low molecular mass copper binding chromopeptides analogous to pyoverdin class iron-binding siderophores. Mb produced by Methylosinus trichosporium OB3b (mb-oB3b) has been used as a model molecuLe for methanobactin although the amino acid sequence of mb-OB3b differs significantly from other characterized mbs. In particular, there is the presence of a pair of cystine residues which are absent in other characterized mbs. The role of the Cys3-Cys6 in copper binding, Cu(ll) reduction and its role on the mb-OB3b structure remains in debate. Here, we use a single-step dithiothreitol treatment as an effective method in reducing the disulfide bond allowing in-depth ion mobility-mass spectrometry (IM-MS) analysis. The IM-MS results show mb-oB3b exists in the gas-phase as three different negatively-charged states and exists in multiple conformational states, when introduced via electrospray ionization from aqueous solution near physiological pH. The disulfide bond serves a structural role and is not involved in the Cu(I/ll) binding capability of mb-OB3b, with the binding of a second Cu(I/ll) related to a further deprotonation of mb-OB3b. Overall, these findings are in good correlation with expected solution-phase behavior of mb-OB3b. The results suggest IM-MS is an effective tool for better understanding the complex nature of this intriguing peptide.
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Affiliation(s)
- DongWon Choi
- Department of BioLogical & Environmental Sciences, Texas A&M University-Commerce, 2600 S Neat St., Commerce. TX 75428, USA
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Petrik M, Haas H, Schrettl M, Helbok A, Blatzer M, Decristoforo C. In vitro and in vivo evaluation of selected 68Ga-siderophores for infection imaging. Nucl Med Biol 2011; 39:361-9. [PMID: 22172389 PMCID: PMC3314960 DOI: 10.1016/j.nucmedbio.2011.09.012] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 09/20/2011] [Accepted: 09/29/2011] [Indexed: 11/10/2022]
Abstract
Introduction Siderophores are low-molecular-mass iron chelators serving as iron transporters for almost all bacteria, fungi and some plants. Iron is an essential element for majority of organisms and plays an important role in virulence of pathogenic organisms. 68Ga is a positron emitter with complexing properties comparable to those of Fe(III) and readily available from a generator. Initial studies with 68Ga-triacetylfusarinine C (TAFC) showed excellent targeting properties in a rat infection model. We report here on the in vitro and in vivo evaluation of other siderophores radiolabelled with 68Ga as potential radiopharmaceuticals for infection imaging. Methods 68Ga labelling was performed using acetate buffer. Stability, log P and protein binding values were determined. In vitro uptake was tested using iron-deficient and iron-sufficient Aspergillus fumigatus (A.f.) cultures. Biodistribution of 68Ga-siderophores was studied in Balb/c mice. Results Significant differences among studied siderophores were observed in labelling efficiency, stability and protein binding. Uptake in A.f. cultures was highly dependent on iron load and type of the siderophore. In mice, 68Ga-TAFC and 68Ga-ferrioxamine E (FOXE) showed rapid renal excretion and low blood values even at a short period after injection; in contrast, 68Ga-ferricrocin and 68Ga-ferrichrome revealed high retention in blood and 68Ga-fusarinine C showed very high kidney retention. Conclusions Some of the studied siderophores bind 68Ga with high affinity and stability, especially 68Ga-TAFC and 68Ga-FOXE. Low values of protein binding, high and specific uptake in A.f., and excellent in vivo biodistribution make them favourable agents for Aspergillus infection imaging.
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Affiliation(s)
- Milos Petrik
- Clinical Department of Nuclear Medicine, Innsbruck Medical University, Innsbruck, Austria
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Janto B, Ahmed A, Ito M, Liu J, Hicks DB, Pagni S, Fackelmayer OJ, Smith TA, Earl J, Elbourne LDH, Hassan K, Paulsen IT, Kolstø AB, Tourasse NJ, Ehrlich GD, Boissy R, Ivey DM, Li G, Xue Y, Ma Y, Hu FZ, Krulwich TA. Genome of alkaliphilic Bacillus pseudofirmus OF4 reveals adaptations that support the ability to grow in an external pH range from 7.5 to 11.4. Environ Microbiol 2011; 13:3289-309. [PMID: 21951522 DOI: 10.1111/j.1462-2920.2011.02591.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Bacillus pseudofirmus OF4 is an extreme but facultative alkaliphile that grows non-fermentatively in a pH range from 7.5 to above 11.4 and can withstand large sudden increases in external pH. It is a model organism for studies of bioenergetics at high pH, at which energy demands are higher than at neutral pH because both cytoplasmic pH homeostasis and ATP synthesis require more energy. The alkaliphile also tolerates a cytoplasmic pH > 9.0 at external pH values at which the pH homeostasis capacity is exceeded, and manages other stresses that are exacerbated at alkaline pH, e.g. sodium, oxidative and cell wall stresses. The genome of B. pseudofirmus OF4 includes two plasmids that are lost from some mutants without viability loss. The plasmids may provide a reservoir of mobile elements that promote adaptive chromosomal rearrangements under particular environmental conditions. The genome also reveals a more acidic pI profile for proteins exposed on the outer surface than found in neutralophiles. A large array of transporters and regulatory genes are predicted to protect the alkaliphile from its overlapping stresses. In addition, unanticipated metabolic versatility was observed, which could ensure requisite energy for alkaliphily under diverse conditions.
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Affiliation(s)
- Benjamin Janto
- Allegheny General Hospital, Allegheny-Singer Research Institute, Center for Genomic Sciences and Department of Microbiology and Immunology, Drexel University College of Medicine, Allegheny Campus, Pittsburgh, PA 15212, USA
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Balasubramanian R, Kenney GE, Rosenzweig AC. Dual pathways for copper uptake by methanotrophic bacteria. J Biol Chem 2011; 286:37313-9. [PMID: 21900235 DOI: 10.1074/jbc.m111.284984] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Methanobactin (Mb), a 1217-Da copper chelator produced by the methanotroph Methylosinus trichosporium OB3b, is hypothesized to mediate copper acquisition from the environment, particularly from insoluble copper mineral sources. Although indirect evidence suggests that Mb provides copper for the regulation and activity of methane monooxygenase enzymes, experimental data for direct uptake of copper loaded Mb (Cu-Mb) are lacking. Uptake of intact Cu-Mb by M. trichosporium OB3b was demonstrated by isotopic and fluorescent labeling experiments. Confocal microscopy data indicate that Cu-Mb is localized in the cytoplasm. Both Cu-Mb and unchelated Cu are taken up by M. trichosporium OB3b, but by different mechanisms. Uptake of unchelated Cu is inhibited by spermine, suggesting a porin-dependent passive transport process. By contrast, uptake of Cu-Mb is inhibited by the uncoupling agents carbonyl cyanide m-chlorophenylhydrazone and methylamine, but not by spermine, consistent with an active transport process. Cu-Mb from M. trichosporium OB3b can also be internalized by other strains of methanotroph, but not by Escherichia coli, suggesting that Cu-Mb uptake is specific to methanotrophic bacteria. These findings are consistent with a key role for Cu-Mb in copper acquisition by methanotrophs and have important implications for further investigation of the copper uptake machinery.
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Gillich T, Benetti EM, Rakhmatullina E, Konradi R, Li W, Zhang A, Schlüter AD, Textor M. Self-Assembly of Focal Point Oligo-catechol Ethylene Glycol Dendrons on Titanium Oxide Surfaces: Adsorption Kinetics, Surface Characterization, and Nonfouling Properties. J Am Chem Soc 2011; 133:10940-50. [DOI: 10.1021/ja202760x] [Citation(s) in RCA: 173] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Torben Gillich
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Edmondo M. Benetti
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Ekaterina Rakhmatullina
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Rupert Konradi
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Wen Li
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Afang Zhang
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - A. Dieter Schlüter
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
| | - Marcus Textor
- Laboratory for Surface Science and Technology, and ‡Institute of Polymers, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
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Draft genome sequence of the thermoalkaliphilic Caldalkalibacillus thermarum strain TA2.A1. J Bacteriol 2011; 193:4290-1. [PMID: 21685297 DOI: 10.1128/jb.05035-11] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The genes and molecular machines that allow for a thermoalkaliphilic lifestyle have not been defined. To address this goal, we report on the improved high-quality draft genome sequence of Caldalkalibacillus thermarum strain TA2.A1, an obligately aerobic bacterium that grows optimally at pH 9.5 and 65 to 70°C on a wide variety of carbon and energy sources.
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Franzmann E, Khalil F, Weidmann C, Schröder M, Rohnke M, Janek J, Smarsly BM, Maison W. A Biomimetic Principle for the Chemical Modification of Metal Surfaces: Synthesis of Tripodal Catecholates as Analogues of Siderophores and Mussel Adhesion Proteins. Chemistry 2011; 17:8596-603. [DOI: 10.1002/chem.201100715] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Indexed: 11/06/2022]
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Gresham GL, Dinescu A, Benson MT, Van Stipdonk MJ, Groenewold GS. Investigation of Uranyl Nitrate Ion Pairs Complexed with Amide Ligands Using Electrospray Ionization Ion Trap Mass Spectrometry and Density Functional Theory. J Phys Chem A 2011; 115:3497-508. [DOI: 10.1021/jp109665a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Adriana Dinescu
- Idaho National Laboratory, Idaho Falls, Idaho, United States
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Bertrand S, Bouchara JP, Venier MC, Richomme P, Duval O, Larcher G. N(α)-methyl coprogen B, a potential marker of the airway colonization by Scedosporium apiospermum in patients with cystic fibrosis. Med Mycol 2011; 48 Suppl 1:S98-107. [PMID: 21067336 DOI: 10.3109/13693786.2010.503972] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Scedosporium apiospermum is an emerging pathogen colonizing the airways of patients with cystic fibrosis (CF). While usually responsible for chronic colonization without clinical signs, this fungus may cause severe and often lethal infections in lung transplant recipients. Early diagnosis of its airway colonization and appropriate treatment are required to eradicate the fungus when a lung transplantation is planned. Here we propose an alternative to mycological examination of sputum samples based on extraction of siderophores by chromatography on Amberlite XAD-4, followed by high performance liquid chromatography analysis of the siderophore extract. Improvement of the extraction procedure was performed in a fractional factorial design which revealed the importance of prior ammonium sulfate precipitation of the proteins, alkalinization of the obtained solution and stirring during extraction. In order to verify the specificity of N(α)-methyl coprogen B for S. apiospermum, the method was applied on culture supernatants of different filamentous fungi colonizing the airways of CF patients, including some aspergilli and Exophiala dermatitidis. N(α)-methyl coprogen B was detected exclusively for species of the S. apiospermum complex. Likewise, sputum samples from colonized and non-colonized CF patients were analyzed, and the siderophore was detected exclusively in three out of the five specimens which were found by culture to contain S. apiospermum. Together these results confirmed N(α)-methyl coprogen B as a marker of the airway colonization by species of the S. apiospermum complex.
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Alexova R, Fujii M, Birch D, Cheng J, Waite TD, Ferrari BC, Neilan BA. Iron uptake and toxin synthesis in the bloom-forming Microcystis aeruginosa under iron limitation. Environ Microbiol 2011; 13:1064-77. [PMID: 21251177 DOI: 10.1111/j.1462-2920.2010.02412.x] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Toxin production during cyanobacterial blooms poses a significant public health threat in water bodies globally and requires the development of effective bloom management strategies. Previously, synthesis of the hepatotoxin microcystin has been proposed to be regulated by iron availability, but the contribution of the toxin to the adaptation of cyanobacteria to environmental stresses, such as changing light intensity and nutrient limitation, remains unclear. The aim of this study was to compare the iron stress response in toxic and non-toxic strains of Microcystis aeruginosa subjected to moderate and severe iron limitation. The transcription of a number of genes involved in iron uptake, oxidative stress response, toxin synthesis and transcriptional control of these processes was accessed by quantitative real-time PCR (qRT-PCR). The process of adaptation of M. aeruginosa to iron stress was found to be highly dynamic and strain-specific. Toxin production in PCC 7806 increased in an iron-dependent manner and appeared to be regulated by FurA. The inability to produce microcystin, either due to natural mutations in the mcy gene cluster or due to insertional inactivation of mcyH, affected the remodelling of the photosynthetic machinery in iron-stressed cells, the transport of Fe(II) and transcription of the Fur family of transcriptional regulators. The presence of the toxin appears to give an advantage to microcystin-producing cyanobacteria in the early stages of exposure to severe iron stress and may protect the cell from reactive oxygen species-induced damage.
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Affiliation(s)
- Ralitza Alexova
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
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Ye Q, Zhou F, Liu W. Bioinspired catecholic chemistry for surface modification. Chem Soc Rev 2011; 40:4244-58. [DOI: 10.1039/c1cs15026j] [Citation(s) in RCA: 966] [Impact Index Per Article: 74.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Sonier MB, Weger HG. Plasma membrane ferric reductase activity of iron-limited algal cells is inhibited by ferric chelators. Biometals 2010; 23:1029-42. [PMID: 20508972 DOI: 10.1007/s10534-010-9348-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Accepted: 05/17/2010] [Indexed: 10/19/2022]
Abstract
Iron-limited cells of the green alga Chlorella kesslerii use a reductive mechanism to acquire Fe(III) from the extracellular environment, in which a plasma membrane ferric reductase reduces Fe(III)-chelates to Fe(II), which is subsequently taken up by the cell. Previous work has demonstrated that synthetic chelators both support ferric reductase activity (when supplied as Fe(III)-chelates) and inhibit ferric reductase. In the present set of experiments we extend these observations to naturally-occurring chelators and their analogues (desferrioxamine B mesylate, schizokinen, two forms of dihydroxybenzoic acid) and also two formulations of the commonly-used herbicide N-(phoshonomethyl)glycine (glyphosate). The ferric forms of the larger siderophores (desferrioxamine B mesylate, schizokinen) and Fe(III)-N-(phoshonomethyl)glycine (as the isopropylamine salt) all supported rapid rates of ferric reductase activity, while the iron-free forms inhibited reductase activity. The smaller siderophores/siderophore precursors, 2,3- and 3,4-dihydroxybenzoic acids, did not support high rates of reductase in the ferric form but did inhibit reductase activity in the iron-free form. Bioassays indicated that Fe(III)-chelates that supported high rates of ferric reductase activity also supported a large stimulation in the growth of iron-limited cells, and that an excess of iron-free chelator decreased the growth rate. With respect to N-(phosphonomethyl)glycine, there were differences between the pure compound (free acid form) and the most common commercial formulation (which also contains isopropylamine) in terms of supporting and inhibiting ferric reductase activity and growth. Overall, these results suggest that photosynthetic organisms that use a reductive strategy for iron acquisition both require, and are potentially simultaneously inhibited by, ferric chelators. Furthermore, these results also may provide an explanation for the frequently contradictory results of N-(phosphonomethyl)glycine application to crops: we suggest that low concentrations of this molecule likely solubilize Fe(III), making it available for plant growth, but that higher (but sub-lethal) concentrations decrease iron acquisition by inhibiting ferric reductase activity.
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Affiliation(s)
- Mathew B Sonier
- Department of Biology, University of Regina, Regina, SK, S4S 0A2, Canada
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