1
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Shankar G, Akhter Y. Stealing survival: Iron acquisition strategies of Mycobacteriumtuberculosis. Biochimie 2024:S0300-9084(24)00142-1. [PMID: 38901792 DOI: 10.1016/j.biochi.2024.06.006] [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: 05/06/2024] [Revised: 06/07/2024] [Accepted: 06/18/2024] [Indexed: 06/22/2024]
Abstract
Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis (TB), faces iron scarcity within the host due to immune defenses. This review explores the importance of iron for Mtb and its strategies to overcome iron restriction. We discuss how the host limits iron as an innate immune response and how Mtb utilizes various iron acquisition systems, particularly the siderophore-mediated pathway. The review illustrates the structure and biosynthesis of mycobactin, a key siderophore in Mtb, and the regulation of its production. We explore the potential of targeting siderophore biosynthesis and uptake as a novel therapeutic approach for TB. Finally, we summarize current knowledge on Mtb's iron acquisition and highlight promising directions for future research to exploit this pathway for developing new TB interventions.
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Affiliation(s)
- Gauri Shankar
- Department of Biotechnology, Babasaheb Bhimrao Ambedkar University, Vidya Vihar, Raebareli Road, Lucknow, Uttar Pradesh, 226 025, India
| | - Yusuf Akhter
- Department of Biotechnology, Babasaheb Bhimrao Ambedkar University, Vidya Vihar, Raebareli Road, Lucknow, Uttar Pradesh, 226 025, India.
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2
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Hider RC, Silva AMN, Cilibrizzi A. The iron(III) coordinating properties of citrate and α-hydroxycarboxylate containing siderophores. Biometals 2024:10.1007/s10534-024-00607-z. [PMID: 38773014 DOI: 10.1007/s10534-024-00607-z] [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: 02/28/2024] [Accepted: 05/05/2024] [Indexed: 05/23/2024]
Abstract
The iron(III) binding properties of citrate and rhizoferrin, a citrate containing siderophore, are compared. Citrate forms many oligonuclear complexes, whereas rhizoferrin forms a single mononuclear complex. The α-hydroxycarboxylate functional group, which is present in both citrate, and rhizoferrin, has a high affinity and selectivity for iron(III) under most biological conditions. The nature of the toxic form of iron found in the blood of patients suffering from many haemoglobinopathies and haemochromatosis is identified as a mixture of iron(III)citrate complexes. The significance of the presence of this iron pool to patients suffering from systemic iron overload is discussed. The wide utilisation of the α-hydroxycarboxylate functional group in siderophore structures is described, as is their photo-induced decarboxylation leading to the release of iron(II) ions. The importance of this facile dissociation to algal iron uptake is discussed.
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Affiliation(s)
- Robert C Hider
- Institute of Pharmaceutical Science, King's College London, London, SE1 9NH, UK.
| | - André M N Silva
- LAQV-REQUIMTE, Departamento de Quimica E Bioquimica, Faculdade de Ciencias, Universidade Do Porto, Rua Do Campo Alegre, S/N, 4169-007, Porto, Portugal
| | - Agostino Cilibrizzi
- Institute of Pharmaceutical Science, King's College London, London, SE1 9NH, UK
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3
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Calderón Celis F, González-Álvarez I, Fabjanowicz M, Godin S, Ouerdane L, Lauga B, Łobiński R. Unveiling the Pool of Metallophores in Native Environments and Correlation with Their Potential Producers. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:17302-17311. [PMID: 37921623 DOI: 10.1021/acs.est.3c04582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
For many organisms, metallophores are essential biogenic ligands that ensure metal scavenging and acquisition from their environment. Their identification is challenging in highly organic matter rich environments like peatlands due to low solubilization and metal scarcity and high matrix complexity. In contrast to common approaches based on sample modification by spiking of metal isotope tags, we have developed a two-dimensional (2D) Solid-phase extraction-Liquid chromatography-mass spectrometry (SPE-LC-MS) approach for the highly sensitive (LOD 40 fmol per g of soil), high-resolution direct detection and identification of metallophores in both their noncomplexed (apo) and metal-complexed forms in native environments. The characterization of peat collected in the Bernadouze (France) peatland resulted in the identification of 53 metallophores by a database mass-based search, 36 among which are bacterial. Furthermore, the detection of the characteristic (natural) metal isotope patterns in MS resulted in the detection of both Fe and Cu potential complexes. A taxonomic-based inference method was implemented based on literature and public database (antiSMASH database version 3.0) searches, enabling to associate over 40% of the identified bacterial metallophores with potential producers. In some cases, low completeness with the MIBiG reference BCG might be indicative of alternative producers in the ecosystem. Thus, coupling of metallophore detection and producers' inference could pave a new way to investigate poorly documented environment searching for new metallophores and their producers yet unknown.
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Affiliation(s)
| | | | - Magdalena Fabjanowicz
- Faculty of Chemistry, Department of Analytical Chemistry, Gdańsk University of Technology, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland
| | - Simon Godin
- E2S UPPA, CNRS, IPREM, Universite de Pau et des Pays de l'Adour, 64000 Pau, France
| | - Laurent Ouerdane
- E2S UPPA, CNRS, IPREM, Universite de Pau et des Pays de l'Adour, 64000 Pau, France
| | - Béatrice Lauga
- E2S UPPA, CNRS, IPREM, Universite de Pau et des Pays de l'Adour, 64000 Pau, France
| | - Ryszard Łobiński
- E2S UPPA, CNRS, IPREM, Universite de Pau et des Pays de l'Adour, 64000 Pau, France
- Chair of Analytical Chemistry, Warsaw University of Technology, 00-664 Warsaw, Poland
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4
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Inomata T, Endo S, Ido H, Mori R, Iwai Y, Ozawa T, Masuda H. Iron(III) Complexes with Hybrid-Type Artificial Siderophores Containing Catecholate and Hydroxamate Sites. Inorg Chem 2023; 62:16362-16377. [PMID: 37738382 DOI: 10.1021/acs.inorgchem.3c01786] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Two hybrid-type artificial siderophore ligands containing both catecholate and hydroxamate groups as iron-capturing sites, bis(2,3-dihydroxybenzamidepropyl)mono[2-propyl]aminomethane (H5LC2H1) and mono(2,3-dihydroxybenzamide-propyl)bis[2-propyl]aminomethane (H4LC1H2), were designed and synthesized. Iron(III) complexes, K2[FeIIILC2H1] and K[FeIIILC1H2], were prepared and characterized spectroscopically, potentiometrically, and electrochemically. The results were compared with those previously reported for iron complexes with non-hybridized siderophores containing either catecholate or hydroxamate groups, K3[FeIIILC3] and [FeIIILH3]. Both K2[FeIIILC2H1] and K[FeIIILC1H2] formed six-coordinate octahedral iron(III) complexes. Evaluation of the thermodynamic properties of the complexes in an aqueous solution indicated high log β values of 37.3 and 32.3 for K2[FeIIILC2H1] and K[FeIIILC1H2], respectively, which were intermediate between those of K3[FeIIILC3] (44.2) and [FeIIILH3] (31). Evaluation of the ultraviolet-visible and Fourier transform infrared spectra of the two hybrid siderophore-iron complexes under different pH or pD (potential of dueterium) conditions showed that the protonation of K2[FeIIILC2H1] and K[FeIIILC1H2] generated the corresponding protonated species, [FeIIIHnLC2H1](2-n)- and [FeIIIHnLC1H2](1-n)-, accompanied by a significant change in the coordination mode. The protonated hybrid-type siderophore-iron complexes showed high reduction potentials, which were well within the range of those of biological reductants. The results suggest that the hybrid-type siderophore easily releases an iron(III) ion at low pH. The biological activity of the four artificial siderophore-iron complexes against Microbacterium flavescens and Escherichia coli clearly depends on the structural differences between the complexes. This finding demonstrates that the changes in the coordination sites of the siderophores enable close control of the interactions between the siderophores and receptors in the cell membrane.
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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
| | - Reon Mori
- Department of Life Science and Applied Chemistry, Graduate School of Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Yusuke Iwai
- 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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5
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Ma C, Zhu X, Li W. Extraction and Separation of Vanadium (IV) by EHEHPA with Citric Acid Complexing Iron (III) from Sulfate Leaching Solution. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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6
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Négrel S, Brunel JM. Synthesis and Biological Activities of Naturally Functionalized Polyamines: An Overview. Curr Med Chem 2021; 28:3406-3448. [PMID: 33138746 DOI: 10.2174/0929867327666201102114544] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 09/01/2020] [Accepted: 09/16/2020] [Indexed: 11/22/2022]
Abstract
Recently, extensive researches have emphasized the fact that polyamine conjugates are becoming important in all biological and medicinal fields. In this review, we will focus our attention on natural polyamines and highlight recent progress in both fundamental mechanism studies and interests in the development and application for the therapeutic use of polyamine derivatives.
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Affiliation(s)
- Sophie Négrel
- Aix Marseille University, Faculty of Pharmacy, UMR-MD1, 27 bd Jean Moulin, 13385 Marseille, France
| | - Jean Michel Brunel
- Aix Marseille University, Faculty of Pharmacy, UMR-MD1, 27 bd Jean Moulin, 13385 Marseille, France
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7
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Butler A, Harder T, Ostrowski AD, Carrano CJ. Photoactive siderophores: Structure, function and biology. J Inorg Biochem 2021; 221:111457. [PMID: 34010741 DOI: 10.1016/j.jinorgbio.2021.111457] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 03/30/2021] [Accepted: 04/03/2021] [Indexed: 12/17/2022]
Abstract
It is well known that bacteria and fungi have evolved sophisticated systems for acquiring the abundant but biologically inaccessible trace element iron. These systems are based on high affinity Fe(III)-specific binding compounds called siderophores which function to acquire, transport, and process this essential metal ion. Many hundreds of siderophores are now known and their numbers continue to grow. Extensive studies of their isolation, structure, transport, and molecular genetics have been undertaken in the last three decades and have been comprehensively reviewed many times. In this review we focus on a unique subset of siderophores that has only been recognized in the last 20 years, namely those whose iron complexes display photoactivity. This photoactivity, which typically results in the photooxidation of the siderophore ligand with concomitant reduction of Fe(III) to Fe(II), seemingly upsets the siderophore paradigm of forming and transporting only extremely stable Fe(III) complexes into microbial cells. Here we review their structure, synthesis, photochemistry, photoproduct coordination chemistry and explore the potential biological and ecological consequences of this photoactivity.
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Affiliation(s)
- Alison Butler
- Department of Chemistry and Biochemistry University of California, Santa Barbara, CA 93106 United States
| | - Tilmann Harder
- Department of Biology and Chemistry, University of Bremen, and Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Germany
| | | | - Carl J Carrano
- Department of Chemistry and Biochemistry, San Diego State University, United States.
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8
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Crumbliss AL, Banerjee S. A perspective essay on the use of Ga 3+ as a proxy for Fe 3+ in bioinorganic model studies and its successful use for therapeutic purposes. J Inorg Biochem 2021; 219:111411. [PMID: 33853006 DOI: 10.1016/j.jinorgbio.2021.111411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 02/15/2021] [Accepted: 02/23/2021] [Indexed: 11/20/2022]
Abstract
The use of Ga3+ as a structural mimic for Fe3+ in model bioinorganic investigations is usually based on a common assumption that Ga3+ and Fe3+ should form bioligand complexes of similar stabilities due to their similar charge/radius ratio (z/r). However, the literature survey presented here is contrary to this notion, showing that under laboratory conditions often Ga3+ forms weaker bioligand complexes than Fe3+in aqueous medium. We hypothesize that this is because Ga3+ is more aquaphilic than Fe3+ as suggested by their relative heats of hydration (ΔHhyd). The successful use of Ga3+ as a therapeutic agent is also briefly reviewed, showing this success often stems from the redox inertness as well as different pharmacokinetics of Ga3+ than Fe3+, but similar metabolic pathways as Fe3+ in human serum.
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Affiliation(s)
- Alvin L Crumbliss
- Duke University Department of Chemistry, Durham, NC 27708-0346, USA.
| | - Sambuddha Banerjee
- Department of Chemistry, East Carolina University, Greenville, NC 27858, USA
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9
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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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10
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Dauner M, Skerra A. Scavenging Bacterial Siderophores with Engineered Lipocalin Proteins as an Alternative Antimicrobial Strategy. Chembiochem 2019; 21:601-606. [PMID: 31613035 PMCID: PMC7079049 DOI: 10.1002/cbic.201900564] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Indexed: 12/30/2022]
Abstract
Iron acquisition mediated by siderophores, high-affinity chelators for which bacteria have evolved specific synthesis and uptake mechanisms, plays a crucial role in microbiology and in host-pathogen interactions. In the ongoing fight against bacterial infections, this area has attracted biomedical interest. Beyond several approaches to interfere with siderophore-mediated iron uptake from medicinal and immunochemistry, the development of high-affinity protein scavengers that tightly complex the siderophores produced by pathogenic bacteria has appeared as a novel strategy. Such binding proteins have been engineered based on siderocalin-also known as lipocalin 2-an endogenous human scavenger of enterobactin and bacillibactin that controls the systemic spreading of commensal bacteria such as Escherichia coli. By using combinatorial protein design, siderocalin was reshaped to bind several siderophores from Pseudomonas aeruginosa and, in particular, petrobactin from Bacillus anthracis, none of which is recognized by the natural protein. Such engineered versions of siderocalin effectively suppress the growth of corresponding pathogenic bacteria by depriving them of their iron supply and offer the potential to complement antibiotic therapy in situations of acute or persistent infection.
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Affiliation(s)
- Martin Dauner
- Institut für Biochemie und Biotechnologie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Strasse 3a, 06120, Halle/Saale, Germany
| | - Arne Skerra
- Lehrstuhl für Biologische Chemie, Technische Universität München, Emil-Erlenmeyer-Forum 5, 85354, Freising, Germany
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11
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Bai Y, Zhao Y, Li Y, Xu J, Fu X, Gao X, Mao X, Li Z. UV-shielding alginate films crosslinked with Fe 3+ containing EDTA. Carbohydr Polym 2019; 239:115480. [PMID: 32414433 DOI: 10.1016/j.carbpol.2019.115480] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 10/13/2019] [Accepted: 10/14/2019] [Indexed: 11/19/2022]
Abstract
In this study, we fabricated a soft, transparent UV-shielding film (Alg-Fe3+-EDTA) by crosslinking sodium alginate with a ferric ion solution containing EDTA. The obtained films were characterized via SEM, ATR-FTIR, XRD, TG and DTG; the results indicated that the synergistic gelation of ferric alginate and alginic acid existed in Alg-Fe3+-EDTA film. The Alg-Fe3+-EDTA film performance to be optimized under the following conditions: 1.6% Fe3+, 0.8% EDTA, and crosslinking duration of 12 min. The Alg-Fe3+-EDTA film had high visible light transmittance, the UV-C (200-280 nm) and UV-B (280-315 nm) shielding rates were 100%, and the UV-A (315-400 nm) shielding rate was 98.37%; the UPF reached 50+; additionally, the tensile strength and elongation-at-break were 56.85 MPa and 10.45%, respectively, and still have ultraviolet shielding effect under water environments or after strong light irradiation. This work provides an efficient method to improve the optical and mechanical ability of ferric alginate films.
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Affiliation(s)
- Yu Bai
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
| | - Yun Zhao
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
| | - Yang Li
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
| | - Jiachao Xu
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China.
| | - Xiaoting Fu
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
| | - Xin Gao
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
| | - Xiangzhao Mao
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
| | - Zhaoyong Li
- College of Food Science and Engineering, Ocean University of China, Qingdao, Shandong 266003, China
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12
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Årstøl E, Hohmann-Marriott MF. Cyanobacterial Siderophores-Physiology, Structure, Biosynthesis, and Applications. Mar Drugs 2019; 17:E281. [PMID: 31083354 PMCID: PMC6562677 DOI: 10.3390/md17050281] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/06/2019] [Accepted: 05/07/2019] [Indexed: 11/16/2022] Open
Abstract
Siderophores are low-molecular-weight metal chelators that function in microbial iron uptake. As iron limits primary productivity in many environments, siderophores are of great ecological importance. Additionally, their metal binding properties have attracted interest for uses in medicine and bioremediation. Here, we review the current state of knowledge concerning the siderophores produced by cyanobacteria. We give an overview of all cyanobacterial species with known siderophore production, finding siderophores produced in all but the most basal clades, and in a wide variety of environments. We explore what is known about the structure, biosynthesis, and cycling of the cyanobacterial siderophores that have been characterized: Synechobactin, schizokinen and anachelin. We also highlight alternative siderophore functionality and technological potential, finding allelopathic effects on competing phytoplankton and likely roles in limiting heavy-metal toxicity. Methodological improvements in siderophore characterization and detection are briefly described. Since most known cyanobacterial siderophores have not been structurally characterized, the application of mass spectrometry techniques will likely reveal a breadth of variation within these important molecules.
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Affiliation(s)
- Erland Årstøl
- Department of Biotechnology, PhotoSynLab, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
| | - Martin F Hohmann-Marriott
- Department of Biotechnology, PhotoSynLab, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
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13
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Herskovitz JE, Worobo RW, Goddard JM. The Role of Solid Support Bound Metal Chelators on System-Dependent Synergy and Antagonism with Nisin. J Food Sci 2019; 84:580-589. [PMID: 30714624 DOI: 10.1111/1750-3841.14444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 12/11/2018] [Accepted: 12/27/2018] [Indexed: 12/01/2022]
Abstract
Active packaging can enhance the performance of natural antimicrobials in controlling food spoilage and waste, while addressing consumer demands for cleaner labels. Yet, synergies are system dependent, with some conditions counterintuitively promoting antagonistic effects. In particular, metal chelators can improve performance of certain natural antimicrobials and have been incorporated in nonmigratory metal chelating active packaging technologies. However, the influence of chelating ligand chemistry on antimicrobial efficacy has not been investigated in microbial spoilage models. The effect of three commercial chelating resins on the growth of Alicyclobacillus acidoterrestris ATCC 49025, a thermoduric acidophilic spore-former, in growth media and apple juice was investigated. Dowex MAC-3, Chelex 100, and Lewatit TP260 were used as models for metal chelating active packaging containing carboxylic acid (CA), iminodiacetic acid (IDA), and aminomethylphosphonic acid (AMPA) ligands. Diameters (CA = 472.4 ± 117.2 μm, IDA = 132.93 ± 26.71 μm, and AMPA = 498.3 ± 29.24 μm), dissociation kinetics (CA = 6.44 ± 0.109, IDA = -0.977 ± 9.94, AMPA = 7.43 ± 0.193), and metal chelating capacities (CA = 1.16 × 10-4 mol/g, IDA = 1.52 × 10-3 mol/g, and AMPA = 4.67 × 10-4 mol/g) were used to distinguish differences in antimicrobial efficacies. Growth of A. acidoterrestris in acidified Potato Dextrose Broth over 24 hr with chelating resins indicated early death phase for CA and IDA resins and bactericidal for AMPA resin. However, viability in commercial apple juice with the inclusion of nisin and chelating resins was variable, with IDA resin significantly (P < 0.05) increasing viability while the effect of CA and AMPA resins remained elusive. This work emphasizes the importance of biological repeatability and correct statistical modeling in identifying conditions under which the antimicrobial intervention of nisin in real food systems, such as acidic beverages and juices, are synergistic or antagonistic. PRACTICAL APPLICATION: New technologies to control microbial food spoilage and waste need to be explored to address consumers on-going demands for reducing additive use. Solid support bound metal chelators can both promote and control microbial growth when used in conjunction with nisin, a natural antimicrobial. This work explores how system conditions can render a given technology either synergistic or antagonistic, and highlights the importance of sufficient biological replicates in experimental design.
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Affiliation(s)
| | - Randy W Worobo
- Dept. of Food Science, Cornell Univ., Ithaca, NY, 14853, U.S.A
| | - Julie M Goddard
- Dept. of Food Science, Cornell Univ., Ithaca, NY, 14853, U.S.A
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14
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Albelda-Berenguer M, Monachon M, Joseph E. Siderophores: From natural roles to potential applications. ADVANCES IN APPLIED MICROBIOLOGY 2019; 106:193-225. [PMID: 30798803 DOI: 10.1016/bs.aambs.2018.12.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Siderophores are secondary metabolites produced by different organisms in order to scavenge iron from their surrounding environment making this essential element available to the cell. Presenting high affinity for ferric iron, siderophores are secreted out to form soluble ferric complexes that can be taken up by the organisms. Siderophores present complex chemistry that allows them to form the strongest iron-chelating complexes. Interest in this field is always up to date and new siderophores are found with new roles and applications. For example, siderophores participate to the mobilization of iron and other elements and are involved in virulence processes. Recently, a strong relation between siderophores and oxidative stress tolerance has been also highlighted. Their application in medicine has been widely studied as well as in agriculture. However, new fields are paying attention to the use of siderophores as green-iron chelators. In particular, siderophores have been proposed for the preservation of cultural heritage.
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Affiliation(s)
- Magdalena Albelda-Berenguer
- Laboratory of Technologies for Heritage Materials, Institute of Chemistry, University of Neuchâtel, Neuchâtel, Switzerland
| | - Mathilde Monachon
- Laboratory of Technologies for Heritage Materials, Institute of Chemistry, University of Neuchâtel, Neuchâtel, Switzerland
| | - Edith Joseph
- Laboratory of Technologies for Heritage Materials, Institute of Chemistry, University of Neuchâtel, Neuchâtel, Switzerland; Haute Ecole Arc Conservation-Restauration, Neuchâtel, Switzerland.
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15
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Study of the coordination of ortho-tyrosine and trans-4-hydroxyproline with aluminum(III) and iron(III). J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.08.074] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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16
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Dauner M, Eichinger A, Lücking G, Scherer S, Skerra A. Neuprogrammierung von humanem Siderocalin zur Neutralisierung von Petrobactin, dem essenziellen Eisenfänger des Milzbrand-Bazillus. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807442] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Martin Dauner
- Lehrstuhl für Biologische Chemie; Technische Universität München; Emil-Erlenmeyer-Forum 5 85354 Freising Deutschland
| | - Andreas Eichinger
- Lehrstuhl für Biologische Chemie; Technische Universität München; Emil-Erlenmeyer-Forum 5 85354 Freising Deutschland
| | - Genia Lücking
- Lehrstuhl für Mikrobielle Ökologie; Technische Universität München; Weihenstephaner Berg 3 85354 Freising Deutschland
| | - Siegfried Scherer
- Lehrstuhl für Mikrobielle Ökologie; Technische Universität München; Weihenstephaner Berg 3 85354 Freising Deutschland
| | - Arne Skerra
- Lehrstuhl für Biologische Chemie; Technische Universität München; Emil-Erlenmeyer-Forum 5 85354 Freising Deutschland
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Dauner M, Eichinger A, Lücking G, Scherer S, Skerra A. Reprogramming Human Siderocalin To Neutralize Petrobactin, the Essential Iron Scavenger of Anthrax Bacillus. Angew Chem Int Ed Engl 2018; 57:14619-14623. [DOI: 10.1002/anie.201807442] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Martin Dauner
- Lehrstuhl für Biologische Chemie; Technische Universität München; Emil-Erlenmeyer-Forum 5 85354 Freising Germany
| | - Andreas Eichinger
- Lehrstuhl für Biologische Chemie; Technische Universität München; Emil-Erlenmeyer-Forum 5 85354 Freising Germany
| | - Genia Lücking
- Lehrstuhl für Mikrobielle Ökologie; Technische Universität München; Weihenstephaner Berg 3 85354 Freising Germany
| | - Siegfried Scherer
- Lehrstuhl für Mikrobielle Ökologie; Technische Universität München; Weihenstephaner Berg 3 85354 Freising Germany
| | - Arne Skerra
- Lehrstuhl für Biologische Chemie; Technische Universität München; Emil-Erlenmeyer-Forum 5 85354 Freising Germany
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18
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Codd R, Soe CZ, Pakchung AAH, Sresutharsan A, Brown CJM, Tieu W. The chemical biology and coordination chemistry of putrebactin, avaroferrin, bisucaberin, and alcaligin. J Biol Inorg Chem 2018; 23:969-982. [PMID: 29946977 DOI: 10.1007/s00775-018-1585-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 06/20/2018] [Indexed: 12/30/2022]
Abstract
Dihydroxamic acid macrocyclic siderophores comprise four members: putrebactin (putH2), avaroferrin (avaH2), bisucaberin (bisH2), and alcaligin (alcH2). This mini-review collates studies of the chemical biology and coordination chemistry of these macrocycles, with an emphasis on putH2. These Fe(III)-binding macrocycles are produced by selected bacteria to acquire insoluble Fe(III) from the local environment. The macrocycles are optimally pre-configured for Fe(III) binding, as established from the X-ray crystal structure of dinuclear [Fe2(alc)3] at neutral pH. The dimeric macrocycles are biosynthetic products of two endo-hydroxamic acid ligands flanked by one amine group and one carboxylic acid group, which are assembled from 1,4-diaminobutane and/or 1,5-diaminopentane as initial substrates. The biosynthesis of alcH2 includes an additional diamine C-hydroxylation step. Knowledge of putH2 biosynthesis supported the use of precursor-directed biosynthesis to generate unsaturated putH2 analogues by culturing Shewanella putrefaciens in medium supplemented with unsaturated diamine substrates. The X-ray crystal structures of putH2, avaH2 and alcH2 show differences in the relative orientations of the amide and hydroxamic acid functional groups that could prescribe differences in solvation and other biological properties. Functional differences have been borne out in biological studies. Although evolved for Fe(III) acquisition, solution coordination complexes have been characterised between putH2 and oxido-V(IV/V), Mo(VI), or Cr(V). Retrosynthetic analysis of 1:1 complexes of [Fe(put)]+, [Fe(ava)]+, and [Fe(bis)]+ that dominate at pH < 5 led to a forward metal-templated synthesis approach to generate the Fe(III)-loaded macrocycles, with apo-macrocycles furnished upon incubation with EDTA. This mini-review aims to capture the rich chemistry and chemical biology of these seemingly simple compounds.
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Affiliation(s)
- Rachel Codd
- School of Medical Sciences (Pharmacology) and Bosch Institute, The University of Sydney, Sydney, NSW, 2006, Australia.
| | - Cho Zin Soe
- School of Medical Sciences (Pharmacology) and Bosch Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Amalie A H Pakchung
- School of Medical Sciences (Pharmacology) and Bosch Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Athavan Sresutharsan
- School of Medical Sciences (Pharmacology) and Bosch Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Christopher J M Brown
- School of Medical Sciences (Pharmacology) and Bosch Institute, The University of Sydney, Sydney, NSW, 2006, Australia
| | - William Tieu
- School of Medical Sciences (Pharmacology) and Bosch Institute, The University of Sydney, Sydney, NSW, 2006, Australia
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19
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β-Hydroxyaspartic acid in siderophores: biosynthesis and reactivity. J Biol Inorg Chem 2018; 23:957-967. [DOI: 10.1007/s00775-018-1584-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 06/20/2018] [Indexed: 01/18/2023]
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20
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Vernia JE, Warmin MR, Krause JA, Tierney DL, Baldwin MJ. Photochemistry and Anion-Controlled Structure of Fe(III) Complexes with an α-Hydroxy Acid-Containing Tripodal Amine Chelate. Inorg Chem 2017; 56:13029-13034. [DOI: 10.1021/acs.inorgchem.7b01799] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jennifer E. Vernia
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Mary R. Warmin
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - Jeanette A. Krause
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
| | - David L. Tierney
- Department
of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - Michael J. Baldwin
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, United States
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21
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Hagan AK, Carlson PE, Hanna PC. Flying under the radar: The non-canonical biochemistry and molecular biology of petrobactin from Bacillus anthracis. Mol Microbiol 2016; 102:196-206. [PMID: 27425635 DOI: 10.1111/mmi.13465] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/15/2016] [Indexed: 01/01/2023]
Abstract
The dramatic, rapid growth of Bacillus anthracis that occurs during systemic anthrax implies a crucial requirement for the efficient acquisition of iron. While recent advances in our understanding of B. anthracis iron acquisition systems indicate the use of strategies similar to other pathogens, this review focuses on unique features of the major siderophore system, petrobactin. Ways that petrobactin differs from other siderophores include: A. unique ferric iron binding moieties that allow petrobactin to evade host immune proteins; B. a biosynthetic operon that encodes enzymes from both major siderophore biosynthesis classes; C. redundancy in membrane transport systems for acquisition of Fe-petrobactin holo-complexes; and, D. regulation that appears to be controlled predominately by sensing the host-like environmental signals of temperature, CO2 levels and oxidative stress, as opposed to canonical sensing of intracellular iron levels. We argue that these differences contribute in meaningful ways to B. anthracis pathogenesis. This review will also outline current major gaps in our understanding of the petrobactin iron acquisition system, some projected means for exploiting current knowledge, and potential future research directions.
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Affiliation(s)
- A K Hagan
- Department of Microbiology and Immunology, University of Michigan Medical School, 1150 W. Medical Center Drive, 6703 Medical Science Building II, Ann Arbor, MI, 48109
| | - P E Carlson
- Laboratory of Mucosal Pathogens and Cellular Immunity, Division of Bacterial, Parasitic, and Allergenic Products, Office of Vaccines Research and Review, Center for Biologics Evaluation and Research, US Food and Drug Administration, 10903 New Hampshire Avenue, Building 52/72; Rm 3306, Silver Spring, MD, 20993
| | - P C Hanna
- Department of Microbiology and Immunology, University of Michigan Medical School, 1150 W. Medical Center Drive, 6703 Medical Science Building II, Ann Arbor, MI, 48109.
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22
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Kümmerli R, Schiessl KT, Waldvogel T, McNeill K, Ackermann M. Habitat structure and the evolution of diffusible siderophores in bacteria. Ecol Lett 2014; 17:1536-44. [DOI: 10.1111/ele.12371] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 07/27/2014] [Accepted: 08/24/2014] [Indexed: 11/26/2022]
Affiliation(s)
- Rolf Kümmerli
- Environmental Microbiology; Swiss Federal Institute of Aquatic Science and Technology; Überlandstrasse 133 Dübendorf 8600 Switzerland
- Microbial Evolutionary Ecology; Institute of Plant Biology; University of Zurich; Winterthurerstrasse 190 Zürich 8057 Switzerland
| | - Konstanze T. Schiessl
- Environmental Microbiology; Swiss Federal Institute of Aquatic Science and Technology; Überlandstrasse 133 Dübendorf 8600 Switzerland
- Department of Environmental Systems Science; Institute of Biogeochemistry and Pollutant Dynamics; Swiss Federal Institute of Technology; Universitätsstrasse 16 Zürich 8092 Switzerland
| | - Tuija Waldvogel
- Environmental Microbiology; Swiss Federal Institute of Aquatic Science and Technology; Überlandstrasse 133 Dübendorf 8600 Switzerland
| | - Kristopher McNeill
- Department of Environmental Systems Science; Institute of Biogeochemistry and Pollutant Dynamics; Swiss Federal Institute of Technology; Universitätsstrasse 16 Zürich 8092 Switzerland
| | - Martin Ackermann
- Environmental Microbiology; Swiss Federal Institute of Aquatic Science and Technology; Überlandstrasse 133 Dübendorf 8600 Switzerland
- Department of Environmental Systems Science; Institute of Biogeochemistry and Pollutant Dynamics; Swiss Federal Institute of Technology; Universitätsstrasse 16 Zürich 8092 Switzerland
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23
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Grabo JE, Chrisman MA, Webb LM, Baldwin MJ. Photochemical Reactivity of the Iron(III) Complex of a Mixed-Donor, α-Hydroxy Acid-Containing Chelate and Its Biological Relevance to Photoactive Marine Siderophores. Inorg Chem 2014; 53:5781-7. [DOI: 10.1021/ic500635q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jennifer E. Grabo
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Mark A. Chrisman
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Lindsay M. Webb
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Michael J. Baldwin
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
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24
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Klein AR, Baldwin DS, Silvester E. Proton and iron binding by the cyanobacterial toxin microcystin-LR. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:5178-5184. [PMID: 23586662 DOI: 10.1021/es400464e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Microcystins (MCs) are a group of hepatotoxins produced by cyanobacteria that have not had their functional role or the environmental factors that trigger production clearly determined. One suggestion is that microcystins are siderophores (i.e., ligands with an extremely high affinity with iron, typically with stability constants substantially greater than 10(25)). In this work, we explore proton and iron binding with microcystin-LR (MC-LR). Using UV-visible spectroscopy and a HPLC peak retention time-based method, the two acid dissociation constants associated with the carboxylic groups of MC-LR were determined to be: pKa₁ = 2.17 and pKa₂ = 3.96. Cyclic voltammetry provides evidence for the formation of at least two Fe(III)-MC-LR complexes, with the Fe(III) reduction peak significantly shifted to more reducing potentials in the presence of MC-LR. These complexes have been interpreted as a rapidly formed initial complex (Complex 1) and a more stable, and slower forming, Complex 2. The stability constant for Fe(III)-MC-LR (Complex 2) was estimated to be approximately 10(13) in 60% v/v MeOH/water at 0.1 M ionic strength. The electrochemical experiments provide no evidence for the formation of a complex between Fe(2+) and MC-LR. Given that most MC-LR is released only upon cell lysis, and coupled with the moderate strength of the stability constant with Fe(III) determined in this study, it appears unlikely that that MC-LR is an extracellular siderophore. If MC-LR is involved in iron regulation in cyanobacteria, it is more likely as a shuttle for iron across the cell membrane or in intracellular processes.
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Affiliation(s)
- Annaleise R Klein
- Department of Environmental Management and Ecology, La Trobe University, Albury-Wodonga Campus, Victoria, Australia.
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25
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Zane HK, Butler A. Isolation, structure elucidation, and iron-binding properties of lystabactins, siderophores isolated from a marine Pseudoalteromonas sp. JOURNAL OF NATURAL PRODUCTS 2013; 76:648-654. [PMID: 23444833 DOI: 10.1021/np3008655] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The marine bacterium Pseudoalteromonas sp. S2B, isolated from the Gulf of Mexico after the Deepwater Horizon oil spill, was found to produce lystabactins A, B, and C (1-3), three new siderophores. The structures were elucidated through mass spectrometry, amino acid analysis, and NMR. The lystabactins are composed of serine (Ser), asparagine (Asn), two formylated/hydroxylated ornithines (FOHOrn), dihydroxy benzoic acid (Dhb), and a very unusual nonproteinogenic amino acid, 4,8-diamino-3-hydroxyoctanoic acid (LySta). The iron-binding properties of the compounds were investigated through a spectrophotometric competition.
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Affiliation(s)
- Hannah K Zane
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
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26
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Zheng T, Nolan EM. Siderophore-based detection of Fe(iii) and microbial pathogens. Metallomics 2012; 4:866-80. [DOI: 10.1039/c2mt20082a] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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27
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Romano AA, Hahn T, Davis N, Lowery CA, Struss AK, Janda KD, Böttger LH, Matzanke BF, Carrano CJ. The Fe(III) and Ga(III) coordination chemistry of 3-(1-hydroxymethylidene) and 3-(1-hydroxydecylidene)-5-(2-hydroxyethyl)pyrrolidine-2,4-dione: novel tetramic acid degradation products of homoserine lactone bacterial quorum sensing molecules. J Inorg Biochem 2011; 107:96-103. [PMID: 22178671 DOI: 10.1016/j.jinorgbio.2011.10.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 10/14/2011] [Accepted: 10/20/2011] [Indexed: 11/26/2022]
Abstract
Bacteria use small diffusible molecules to exchange information in a process called quorum sensing (QS). An important class of quorum sensing molecules used by Gram-negative bacteria is the family of N-acylhomoserine lactones (HSL). It was recently discovered that a degradation product of the QS molecule 3-oxo-C(12)-homoserine lactone, the tetramic acid 3-(1-hydroxydecylidene)-5-(2-hydroxyethyl)pyrrolidine-2,4-dione, is a potent antibacterial agent, thus implying roles for QS outside of simply communication. Because these tetramic acids also appear to bind iron with appreciable affinity it was suggested that metal binding might contribute to their biological activity. Here, using a variety of spectroscopic tools, we describe the coordination chemistry of both the methylidene and decylidene tetramic acid derivatives with Fe(III) and Ga(III) and discuss the potential biological significance of such metal binding.
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Affiliation(s)
- Ariel A Romano
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030, USA
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28
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Caboche S, Leclère V, Pupin M, Kucherov G, Jacques P. Diversity of monomers in nonribosomal peptides: towards the prediction of origin and biological activity. J Bacteriol 2010; 192:5143-50. [PMID: 20693331 PMCID: PMC2944527 DOI: 10.1128/jb.00315-10] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Accepted: 07/26/2010] [Indexed: 11/20/2022] Open
Abstract
Nonribosomal peptides (NRPs) are molecules produced by microorganisms that have a broad spectrum of biological activities and pharmaceutical applications (e.g., antibiotic, immunomodulating, and antitumor activities). One particularity of the NRPs is the biodiversity of their monomers, extending far beyond the 20 proteogenic amino acid residues. Norine, a comprehensive database of NRPs, allowed us to review for the first time the main characteristics of the NRPs and especially their monomer biodiversity. Our analysis highlighted a significant similarity relationship between NRPs synthesized by bacteria and those isolated from metazoa, especially from sponges, supporting the hypothesis that some NRPs isolated from sponges are actually synthesized by symbiotic bacteria rather than by the sponges themselves. A comparison of peptide monomeric compositions as a function of biological activity showed that some monomers are specific to a class of activities. An analysis of the monomer compositions of peptide products predicted from genomic information (metagenomics and high-throughput genome sequencing) or of new peptides detected by mass spectrometry analysis applied to a culture supernatant can provide indications of the origin of a peptide and/or its biological activity.
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Affiliation(s)
- Ségolène Caboche
- ProBioGEM (UPRES EA 1026), Université Lille Nord de France, USTL, F59655 Villeneuve d'Ascq, France.
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29
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Sayre H, Milos K, Goldcamp MJ, Schroll CA, Krause JA, Baldwin MJ. Mixed-donor, alpha-hydroxy acid-containing chelates for binding and light-triggered release of iron. Inorg Chem 2010; 49:4433-9. [PMID: 20397713 DOI: 10.1021/ic9018629] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of five new alpha-hydroxy acid-containing chelates inspired by photoactive marine siderophores, along with their Fe(III) complexes, have been synthesized and characterized. These chelates, designated X-Sal-AHA, each contributes a bidentate salicylidene moiety (X-Sal, X = 5-NO(2), 3,5-diCl, H, 3,5-di-tert-butyl, or 3-OCH(3) on the phenolate ring) and a bidentate alpha-hydroxy acid moiety (AHA). The X-ray crystal structure of Na[Fe(3)(3,5-diCl-Sal-AHA)(3)(mu(3)-OCH(3))] shows an Fe(III) trimer with the triply deprotonated, trianionic ligands each spanning two Fe(III)'s that are bridged by the hydroxyl group of the ligand. Additionally, a mu(3)-methoxy anion caps the Fe(III)(3) face. Electrospray ionization mass spectra demonstrate that this structure is representative of the Fe(III) complexes of all five derivatives in methanol solution, with the exception of the X = 3,5-di-t-Bu derivative having a mu(3)-OH bridge rather than a methoxy bridge. Stability constants determined from reduction potentials range from 10(34) for the 5-NO(2) derivative to >10(40) for the 3,5-di-tBu derivative. All five complexes are photoactive when irradiated by sunlight, with the relative rate of photolysis as monitored by Fe(II) transfer correlating with the Hammett sigma(+) parameter for the phenolate ring substituents.
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Affiliation(s)
- Hannah Sayre
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, USA
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30
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Hotta K, Kim CY, Fox DT, Koppisch AT. Siderophore-mediated iron acquisition in Bacillus anthracis and related strains. MICROBIOLOGY-SGM 2010; 156:1918-1925. [PMID: 20466767 DOI: 10.1099/mic.0.039404-0] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Recent observations have shed light on some of the endogenous iron-acquisition mechanisms of members of the Bacillus cereus sensu lato group. In particular, pathogens in the B. cereus group use siderophores with both unique chemical structures and biological roles. This review will focus on recent discoveries in siderophore biosynthesis and biology in this group, which contains numerous human pathogens, most notably the causative agent of anthrax, Bacillus anthracis.
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Affiliation(s)
- Kinya Hotta
- Department of Biological Sciences, National University of Singapore, Singapore
| | - Chu-Young Kim
- Department of Biological Sciences, National University of Singapore, Singapore
| | - David T Fox
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Andrew T Koppisch
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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31
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de Carvalho CCCR, Fernandes P. Production of metabolites as bacterial responses to the marine environment. Mar Drugs 2010; 8:705-27. [PMID: 20411122 PMCID: PMC2857360 DOI: 10.3390/md8030705] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 02/26/2010] [Accepted: 03/16/2010] [Indexed: 12/16/2022] Open
Abstract
Bacteria in marine environments are often under extreme conditions of e.g., pressure, temperature, salinity, and depletion of micronutrients, with survival and proliferation often depending on the ability to produce biologically active compounds. Some marine bacteria produce biosurfactants, which help to transport hydrophobic low water soluble substrates by increasing their bioavailability. However, other functions related to heavy metal binding, quorum sensing and biofilm formation have been described. In the case of metal ions, bacteria developed a strategy involving the release of binding agents to increase their bioavailability. In the particular case of the Fe3+ ion, which is almost insoluble in water, bacteria secrete siderophores that form soluble complexes with the ion, allowing the cells to uptake the iron required for cell functioning. Adaptive changes in the lipid composition of marine bacteria have been observed in response to environmental variations in pressure, temperature and salinity. Some fatty acids, including docosahexaenoic and eicosapentaenoic acids, have only been reported in prokaryotes in deep-sea bacteria. Cell membrane permeability can also be adapted to extreme environmental conditions by the production of hopanoids, which are pentacyclic triterpenoids that have a function similar to cholesterol in eukaryotes. Bacteria can also produce molecules that prevent the attachment, growth and/or survival of challenging organisms in competitive environments. The production of these compounds is particularly important in surface attached strains and in those in biofilms. The wide array of compounds produced by marine bacteria as an adaptive response to demanding conditions makes them suitable candidates for screening of compounds with commercially interesting biological functions. Biosurfactants produced by marine bacteria may be helpful to increase mass transfer in different industrial processes and in the bioremediation of hydrocarbon-contaminated sites. Siderophores are necessary e.g., in the treatment of diseases with metal ion imbalance, while antifouling compounds could be used to treat man-made surfaces that are used in marine environments. New classes of antibiotics could efficiently combat bacteria resistant to the existing antibiotics. The present work aims to provide a comprehensive review of the metabolites produced by marine bacteria in order to cope with intrusive environments, and to illustrate how such metabolites can be advantageously used in several relevant areas, from bioremediation to health and pharmaceutical sectors.
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Affiliation(s)
- Carla C C R de Carvalho
- IBB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
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