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Phungula A, Waddad AY, Fernandez Leyes MD, Di Gianvincenzo P, Espuche B, Zuffi S, Moya SE, Albericio F, de la Torre BG. Self-assembly of NrTP6 cell-penetrating lipo-peptide with variable number of lipid chains: Impact of phosphate ions on lipid association. J Colloid Interface Sci 2024; 654:124-133. [PMID: 37837849 DOI: 10.1016/j.jcis.2023.09.161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 09/14/2023] [Accepted: 09/27/2023] [Indexed: 10/16/2023]
Abstract
HYPOTHESIS Lipopeptides synthesized from the Nucleolar Targeting Peptide (NrTP6) with one, two or four dodecanoic fatty acid (FA) chains, display large head to tail volumes, which together with the number of lipid chains per molecule, impacts their self-assembly behavior. In phosphate buffer (PB), peptide to peptide interactions are triggered by the presence of phosphate ions that act as ionic crosslinkers, affecting the organization of the lipid assemblies. EXPERIMENTAL The NrTP6 lipopeptides were synthesized by the solid phase peptide synthesis technique. The critical micellar concentration (CMC) of the lipopeptides was determined in water and PB by pyrene fluorescence. The size and morphology of lipopeptide assemblies were characterized by dynamic light scattering (DLS) and transmission electron microscopy (TEM). Circular dichroism (CD) was used to study the secondary structures of the lipopeptide assemblies. RESULTS For NrTP6 lipopeptides with two and four lipid chains, CMCs in water are larger than in PB. TEM images of the lipopeptide assemblies show different morphologies including fibers, rods, and spheres depending on the number of lipid chains, concentration and whether they are assembled in water or PB. CD spectroscopy shows that the peptide conformation, either random or beta, correlates with the morphology of the assemblies.
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Affiliation(s)
- Amanda Phungula
- Peptide Science Laboratory, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa; Soft Matter Nanotechnology Laboratory, CIC biomaGUNE, San-Sebastian 20010, Spain
| | - Ayman Y Waddad
- Peptide Science Laboratory, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa
| | - Marcos Daniel Fernandez Leyes
- Soft Matter Nanotechnology Laboratory, CIC biomaGUNE, San-Sebastian 20010, Spain; Instituto de Fisica del Sur (IFISUR-CONICET), Av. Alem 1253, Bahia Blanca 8000, Argentina
| | | | - Bruno Espuche
- Soft Matter Nanotechnology Laboratory, CIC biomaGUNE, San-Sebastian 20010, Spain; POLYMAT, Applied Chemistry Department, Faculty of Chemistry, University of the Basque Country, UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Guipúzcoa, Spain
| | - Sofia Zuffi
- Soft Matter Nanotechnology Laboratory, CIC biomaGUNE, San-Sebastian 20010, Spain
| | - Sergio Enrique Moya
- Soft Matter Nanotechnology Laboratory, CIC biomaGUNE, San-Sebastian 20010, Spain.
| | - Fernando Albericio
- Peptide Science Laboratory, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa; CIBER-BBN and Department of Organic Chemistry, University of Barcelona, Barcelona 08001, Spain
| | - Beatriz G de la Torre
- Peptide Science Laboratory, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa; KRISP, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban 4001, South Africa.
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Dey P, Das G, Ramesh A. Interplay between Supramolecular and Coordination Interactions in Synthetic Amphiphiles: Triggering Metal Starvation and Anchorage onto MRSA Cell Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2110-2119. [PMID: 32031818 DOI: 10.1021/acs.langmuir.9b03073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The present work highlights the implications of supramolecular interaction and metal coordination on the self-assembly behavior and bactericidal potential of salicaldehyde-(C1) and napthaldehyde-based (C2) amphiphiles against methicillin-resistant Staphylococcus aureus (MRSA). LB trough and atomic force microscope (AFM) analysis indicated the propensity of the amphiphiles to form a monolayer as well as spherical aggregates, with the critical micelle concentration (CMC) for C2 (7.0 μM) being lower than C1 (18.5 μM) in water. Formation of an amphiphile-metal complex was evidenced by ESI-MS, FTIR, FETEM-EDX, and ITC analysis. Growth of S. aureus MRSA 100 cells was remarkably impaired in the presence of 5.0 μM C1 or 20 μM C2 as compared to free cells or cells grown in the presence of equivalent levels of amphiphile-metal complexes, suggesting that the amphiphiles perhaps sequester metal and induce metal starvation in MRSA. C1 and C2 rendered superior membrane damage in MRSA and were less toxic to human embryonic kidney (HEK 293) cells as compared to their metal complexes. C1 and C2 rendered a dose-dependent inhibition of S. aureus biofilm formation, while revival of biofilm upon Zn(II) addition suggested that zinc starvation rendered by the amphiphiles may induce biofilm inhibition. C1 imposed a concentration-dependent metal starvation response in MRSA as there was an upregulation of the cntL gene and downregulation of cntA gene, which are involved in synthesis of the zincophore staphylopine (Stp) and transport of the Stp-Zn complex, respectively. ITC analysis revealed that binding of C1 and C2 to staphylococcal lipoteichoic acid (LTA) was stronger than the corresponding Zn(II) complexes, which perhaps accounted for the higher bactericidal potency of the amphiphiles. The study provides a fundamental understanding on how the chemistry-driven multimodal interaction of the amphiphile translates into growth inhibition and metal starvation in MRSA and advances the idea of combating drug resistance in pathogenic bacteria through amphiphiles, which are pluri-active.
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Affiliation(s)
- Poulomi Dey
- Department of Biosciences and Bioengineering Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Gopal Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Aiyagari Ramesh
- Department of Biosciences and Bioengineering Indian Institute of Technology Guwahati, Guwahati 781039, India
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Kaur G, Kaur B, Garg P, Chaudhary GR, Gawali SL, Hassan P. A study of synthesis, characterization and metalloplex formation ability of cetylpyridinium chloride based metallosomes. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112326] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sadeghi I, Asatekin A. Spontaneous Self‐Assembly and Micellization of Random Copolymers in Organic Solvents. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700226] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ilin Sadeghi
- Chemical and Biological Engineering Department Tufts University Medford MA 02155 USA
| | - Ayse Asatekin
- Chemical and Biological Engineering Department Tufts University Medford MA 02155 USA
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An overview of siderophores for iron acquisition in microorganisms living in the extreme. Biometals 2016; 29:551-71. [PMID: 27457587 DOI: 10.1007/s10534-016-9949-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 07/08/2016] [Indexed: 12/11/2022]
Abstract
Siderophores are iron-chelating molecules produced by microbes when intracellular iron concentrations are low. Low iron triggers a cascade of gene activation, allowing the cell to survive due to the synthesis of important proteins involved in siderophore synthesis and transport. Generally, siderophores are classified by their functional groups as catecholates, hydroxamates and hydroxycarboxylates. Although other chemical structural modifications and functional groups can be found. The functional groups participate in the iron-chelating process when the ferri-siderophore complex is formed. Classified as acidophiles, alkaliphiles, halophiles, thermophiles, psychrophiles, piezophiles, extremophiles have particular iron requirements depending on the environmental conditions in where they grow. Most of the work done in siderophore production by extremophiles is based in siderophore concentration and/or genomic studies determining the presence of siderophore synthesis and transport genes. Siderophores produced by extremophiles are not well known and more work needs to be done to elucidate chemical structures and their role in microorganism survival and metal cycling in extreme environments.
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Abstract
This Feature Article discusses several classes of lipopeptide with important biomedical applications as antimicrobial and antifungal agents, in immune therapies and in personal care applications among others. Two main classes of lipopeptide are considered: (i) bacterially-expressed lipopeptides with a cyclic peptide headgroup and (ii) linear lipopeptides (with one or more lipid chains) based on bio-derived and bio-inspired amino acid sequences with current clinical applications. The applications are briefly summarized, and the biophysical characterization of the molecules is reviewed, with a particular focus on self-assembly. For several of these types of biomolecule, the formation of micelles above a critical micelle concentration has been observed while others form bilayer structures, depending on conditions of pH and temperature. As yet, there are few studies on the possible relationship between self-assembly into structures such as micelles and bioactivity of this class of molecule although this is likely to attract further attention.
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Affiliation(s)
- Ian W Hamley
- Dept of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, UK.
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Serrano Figueroa LO, Pitts B, Uchida M, Richards AM. Vesicle self-assembly of amphiphilic siderophores produced by bacterial isolates from Soap Lake, Washington. CAN J CHEM 2016. [DOI: 10.1139/cjc-2015-0173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Soap Lake, located in Washington State, is a meromictic soda lake that was the subject of a prior National Science Foundation funded Microbial Observatory. Several organisms inhabiting this lake have been identified as producers of siderophores that are unique in structure. Two isolates found to be of the species Halomonas, SL01 and SL28, were found to produce suites of amphiphilic siderophores consisting of a peptidic head-group, which binds iron appended to fatty acid moieties of various lengths. The ability for siderophores to self-assemble into vesicles was determined for three suites of amphiphilic siderophores of unique structure (two from SL01 and one from SL28). These siderophores resemble the amphiphilic aquachelin siderophores produced by Halomonas aquamarina strain DS40M3, a marine bacterium. Vesicle self-assembly studies were performed by dynamic light scattering and epifluorescence microscopy. The addition of ferric iron (Fe3+) at different equivalents, where an equivalence of iron is defined as equal to the molarity of the siderophore, demonstrated vesicle formation. This was suggested by both dynamic light scattering and epifluorescence microscopy. Bacteria thriving under saline and alkaline conditions are capable of producing unique siderophores that self-assemble in micelles and vesicles due to ferric iron chelation.
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Affiliation(s)
- Luis O’mar Serrano Figueroa
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA
- Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA
| | - Betsey Pitts
- Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA
| | - Masaki Uchida
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
| | - Abigail M. Richards
- Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA
- Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT 59717, USA
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Huang G, Tong G, Liu J, Zhang W, Chen L, Quan C, Jiang Q, Sun H, Zhang C. Construction of Silver Nanoparticle-Loaded MicellesViaCoordinate Interaction and Their Antibacterial Activity. INT J POLYM MATER PO 2015. [DOI: 10.1080/00914037.2015.1030655] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Self-assembly of surfactin in aqueous solution: role of divalent counterions. Colloids Surf B Biointerfaces 2013; 116:396-402. [PMID: 24524939 DOI: 10.1016/j.colsurfb.2013.12.034] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 12/16/2013] [Accepted: 12/17/2013] [Indexed: 11/20/2022]
Abstract
Myriad applications of surfactin in environmental and biomedical field prompt understanding the self-assembly behaviour of surfactin in aqueous solution as well as its interaction with counterions. Effect of four divalent counterions namely, Ni(2+), Zn(2+), Cd(2+), and Ca(2+) on the self-assembly of the surfactin, a biosurfactant isolated from Bacillus subtilis YB7 is studied by fluorescence spectroscopy, dynamic light scattering, optical and electron microscopic studies. The critical micelle concentration (CMC) and aggregation number (Nagg) of surfactin are 96.76 ± 15.49 μM and 101.12 ± 2.53, respectively. The degree of counterion association increases as its ionic radius decreases. Ni(2+) exhibits the highest and Ca(2+) the least degree of counterion association. Addition of counterion reduces the size of the microstructures, aggregation number (Nagg) and zeta potential. The reduction in the zeta potential indicates the neutralization of the negative charges on the electrical double layer of the microstructures. Differential interference contrast (DIC) and transmission electron microscopic (TEM) images of surfactin show the presence of vesicles and large aggregates including giant vesicles. On the addition of Ca(2+), fusion of vesicles into large aggregates is predominantly observed. Ni(2+) induces the transition of large spherical vesicles into small spherical, worm-like vesicles and multicompartment-like structures (vesosome). Such structures are the evidences for metal ion coordinated intervesicular interactions. This study reveals that the self-assembly process of surfactin can be controlled by the addition of metal ions according to the requirements.
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Song S, Fu P, Wang Y, Wang Z, Qian Y. Investigation on the behavior of choline-derived cationic surfactant in aqueous solution in the absence and presence of PdCl2. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.02.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Braun J, Renggli K, Razumovitch J, Vebert C. Dynamic Light Scattering in Supramolecular Materials Chemistry. Supramol Chem 2012. [DOI: 10.1002/9780470661345.smc039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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13
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Gledhill M, Buck KN. The organic complexation of iron in the marine environment: a review. Front Microbiol 2012; 3:69. [PMID: 22403574 PMCID: PMC3289268 DOI: 10.3389/fmicb.2012.00069] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Accepted: 02/09/2012] [Indexed: 11/13/2022] Open
Abstract
Iron (Fe) is an essential micronutrient for marine organisms, and it is now well established that low Fe availability controls phytoplankton productivity, community structure, and ecosystem functioning in vast regions of the global ocean. The biogeochemical cycle of Fe involves complex interactions between lithogenic inputs (atmospheric, continental, or hydrothermal), dissolution, precipitation, scavenging, biological uptake, remineralization, and sedimentation processes. Each of these aspects of Fe biogeochemical cycling is likely influenced by organic Fe-binding ligands, which complex more than 99% of dissolved Fe. In this review we consider recent advances in our knowledge of Fe complexation in the marine environment and their implications for the biogeochemistry of Fe in the ocean. We also highlight the importance of constraining the dissolved Fe concentration value used in interpreting voltammetric titration data for the determination of Fe speciation. Within the published Fe speciation data, there appear to be important temporal and spatial variations in Fe-binding ligand concentrations and their conditional stability constants in the marine environment. Excess ligand concentrations, particularly in the truly soluble size fraction, seem to be consistently higher in the upper water column, and especially in Fe-limited, but productive, waters. Evidence is accumulating for an association of Fe with both small, well-defined ligands, such as siderophores, as well as with larger, macromolecular complexes like humic substances, exopolymeric substances, and transparent exopolymers. The diverse size spectrum and chemical nature of Fe ligand complexes corresponds to a change in kinetic inertness which will have a consequent impact on biological availability. However, much work is still to be done in coupling voltammetry, mass spectrometry techniques, and process studies to better characterize the nature and cycling of Fe-binding ligands in the marine environment.
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Affiliation(s)
- Martha Gledhill
- Ocean and Earth Science, National Oceanography Centre - Southampton, University of Southampton Southampton, UK
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Shi X, Wang H, Han T, Feng X, Tong B, Shi J, Zhi J, Dong Y. A highly sensitive, single selective, real-time and “turn-on” fluorescent sensor for Al3+ detection in aqueous media. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33393g] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Owen T, Butler A. Metallosurfactants of bioinorganic interest: Coordination-induced self assembly. Coord Chem Rev 2011; 225:678-687. [PMID: 21603255 PMCID: PMC3095519 DOI: 10.1016/j.ccr.2010.12.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
This review covers selected surfactant ligands that undergo a change in aggregate morphology upon coordination of a metal ion, with a particular focus on coordination-induced micelle-to-vesicle transitions. The surfactants include microbially produced amphiphilic siderophores, as well as synthetic amphiphilic ligands. The mechanism of the metal-induced phase change is considered in light of the coordination chemistry of the metal ions, the nature of the ligands, and changes in molecular geometry that result from metal coordination. Of particular interest are biologically produced amphiphiles that coordinate transition metal ions and amphiphilic ligands of relevance to bioinorganic chemistry.
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Affiliation(s)
| | - Alison Butler
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, CA 93106-9510, United States
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Parera E, Comelles F, Barnadas R, Suades J. Formation of vesicles with an organometallic amphiphile bilayer by supramolecular arrangement of metal carbonyl metallosurfactants. Chem Commun (Camb) 2011; 47:4460-2. [DOI: 10.1039/c0cc05493c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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17
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Nishimura T, Masunaga H, Ogawa H, Akiba I, Sakurai K. Cation-specific Transition from Vesicle to Lamella for an Aromatic Diamine Lipid in Aqueous Solutions. CHEM LETT 2010. [DOI: 10.1246/cl.2010.686] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Butler A, Theisen RM. Iron(III)-siderophore coordination chemistry: Reactivity of marine siderophores. Coord Chem Rev 2010; 254:288-296. [PMID: 21442004 PMCID: PMC3062850 DOI: 10.1016/j.ccr.2009.09.010] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two remarkable features of many siderophores produced by oceanic bacteria are the prevalence of an α-hydroxy-carboxylic acid functionality either in the form of the amino acid β-hydroxy aspartic acid or in the form of citric acid, as well as the predominance of amphiphilic siderophores. This review will provide an overview of the photoreactivity that takes place when siderophores containing β-hydroxy aspartic acid and citric acid are coordinated to iron(III). This photoreactivity raises questions about the role of this photochemistry in microbial iron acquisition as well as upper-ocean iron cycling. The self-assembly of amphiphilic siderophores and the coordination-induced phase-change of the micelle-to-vesicle transformation will also be reviewed. The distinctive photosensitive and self-assembly properties of marine siderophores hint at possibly new microbial iron acquisition mechanisms.
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Affiliation(s)
- Alison Butler
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, CA 93106-9510, United States
| | - Roslyn M. Theisen
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, CA 93106-9510, United States
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Parera E, Comelles F, Barnadas R, Suades J. New surfactant phosphine ligands and platinum(II) metallosurfactants. Influence of metal coordination on the critical micelle concentration and aggregation properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:743-751. [PMID: 20067304 DOI: 10.1021/la902459f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have prepared the first platinum(II) metallosurfactants from a new family of linear surfactant phosphines Ph(2)P(CH(2))(n)SO(3)Na {1 (n = 2), 2 (n = 6), and 3 (n = 10)}, which were synthesized by reaction between the halosulfonates X(CH(2))(n)SO(3)Na and sodium diphenylphosphide. The metallosurfactants cis-[PtCl(2)L(2)] (L = 1-3) were obtained after reaction between the phosphines and PtCl(2) in dimethylsulfoxide. All compounds were fully characterized by the usual methods {NMR ((1)H, (13)C, (31)P, (195)Pt), IR, MS-ESI and HRMS}. By exploring the surfactant properties of phosphines 1-3 and their respective platinum metallosurfactants cis-[PtCl(2)L(2)] (L = 1-3) through surface tension measurements, dynamic light scattering spectroscopy, and cryo-TEM microscopy, we were able to analyze the influence of the metal coordination on the critical micelle concentration (cmc) and the aggregation properties. The cmc values of platinum metallosurfactants were considerably lower than those obtained for the free phosphines 1-3. This behavior could be understood by an analogy between the structure of cis-[PtCl(2)L(2)] complexes and bolaform surfactants. The calculated values of area per molecule also showed different tendencies between 1-3 and cis-[PtCl(2)L(2)] complexes, which could be explained on the basis of the possible conformations of these compounds in the air-water interface. The study of aggregates by dynamic light scattering spectroscopy and cryo-TEM microscopy showed the formation of spherical disperse medium size vesicles in all cases. However, substantial differences were observed between the three free phosphines (the population of micellar aggregates increased with long chain length) and also between phosphines and their respective metallosurfactants.
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Affiliation(s)
- Elisabet Parera
- Departament de Química, Universitat Autònoma de Barcelona, Edifici C, 08193 Bellaterra, Spain
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Zhang G, Amin SA, Küpper FC, Holt PD, Carrano CJ, Butler A. Ferric stability constants of representative marine siderophores: marinobactins, aquachelins, and petrobactin. Inorg Chem 2009; 48:11466-73. [PMID: 19902959 PMCID: PMC2790009 DOI: 10.1021/ic901739m] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The coordination of iron(III) to the marine amphiphilic marinobactin and aquachelin siderophores, as well as to petrobactin, an unusual 3,4-dihydroxybenzoyl siderophore is reported. Potentiometric titrations were performed on the apo siderophore to determine the ligand pK(a) values, as well as the complex formed with addition of 1 equiv of Fe(III). The log K(ML) values for Fe(III)-marinobactin-E and Fe(III)-aquachelin-C are 31.80 and 31.4, respectively, consistent with the similar coordination environment in each complex, while log K(ML) for Fe(III)-petrobactin is estimated to be about 43. The pK(a) of the beta-hydroxyaspartyl hydroxyl group was determined to be 10.8 by (1)H NMR titration. (13)C NMR and IR spectroscopy were used to investigate Ga(III) coordination to the marinobactins. The coordination-induced shifts (CIS) in the (13)C NMR spectrum of Ga(III)-marinobactin-C compared to apo-marinobactin-C indicates that the hydroxamate groups are coordinated to Ga(III); however, the lack of CISs for the carbons of the beta-hydroxyamide group suggests this moiety is not coordinated in the Ga(III) complex. Differences in the IR spectrum of Ga(III)-marinobactin-C and Fe(III)-marinobactin-C in the 1600-1700 cm(-1) region also corroborates Fe(III) is coordinated to the beta-hydroxyamide moiety, whereas Ga(III) is not coordinated.
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Affiliation(s)
- Guangping Zhang
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510 and Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030
| | - Shady A. Amin
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510 and Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030
| | - Frithjof C. Küpper
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510 and Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030
| | - Pamela D. Holt
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510 and Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030
| | - Carl J. Carrano
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510 and Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030
| | - Alison Butler
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510 and Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030
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Teng M, Song A, Hao J. Mg2+-induced vesicles of tetradecyldimethylamine oxide and magnesium dodecyl sulfate. J Colloid Interface Sci 2009; 338:537-41. [PMID: 19615689 DOI: 10.1016/j.jcis.2009.06.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 06/15/2009] [Accepted: 06/16/2009] [Indexed: 11/30/2022]
Abstract
A Mg2+-induced vesicle phase was prepared from a mixture of tetradecyldimethylamine oxide (C14DMAO) and magnesium dodecyl sulfate [Mg(DS)2] in aqueous solution. Study of the phase behavior shows that at the appropriate mixing ratios, Mg2+-ligand coordination between C14DMAO and Mg(DS)2 results in the formation of molecular bilayers, in which Mg2+ can firmly bind to the head groups of the two surfactants. The area of the head group can be reduced because of the complexation. In this case, no counterions exist in aqueous solution because of the fixation of Mg2+ ions to the bilayer membranes. Therefore, the charges of the bilayer membranes are not shielded by salts. The birefringent solutions of Mg(DS)2 and C14DMAO mixtures consist of vesicles which were determined by transmission electron microscopy (TEM) images and rheological measurements. Magnesium oxide (MgO) nanoplates were obtained via the decomposition of Mg(OH)2 which were synthesized in Mg2+-induced vesicle phase which was used as the microreactor under the existence of ammonia hydroxide. The morphologies and structures of the obtained MgO nanoplates have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the crystal growth is along the (111) direction which can be affected by the presence of a vesicle phase having a fixation of Mg2+ ions to the bilayer membranes.
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Affiliation(s)
- Minmin Teng
- Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100, People's Republic of China
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Affiliation(s)
- Moriah Sandy
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106-9510, USA
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23
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Pagès C, Coppel Y, Kahn ML, Maisonnat A, Chaudret B. Self-Assembly of ZnO Nanocrystals in Colloidal Solutions. Chemphyschem 2009; 10:2334-44. [DOI: 10.1002/cphc.200900204] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Brandel J, Torelli S, Gellon G, Serratrice G, Putaux JL, Pierre JL. From Molecular to Nanostructured Iron Complexes of Amphiphilic Chelators Based on 8-Hydroxyquinoline Subunits - Evidence of Self-Assembled Edifices Mimicking Siderophores from Marine Bacteria. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200800741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Pakchung A, Soe C, Codd R. Studies of Iron-Uptake Mechanisms in Two Bacterial Species of theShewanellaGenus Adapted to Middle-Range (Shewanella putrefaciens) or Antarctic (Shewanella gelidimarina) Temperatures. Chem Biodivers 2008; 5:2113-2123. [DOI: 10.1002/cbdv.200890192] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Gonzaga F, Singh S, Brook MA. Biomimetic synthesis of gold nanocrystals using a reducing amphiphile. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2008; 4:1390-1398. [PMID: 18711754 DOI: 10.1002/smll.200701163] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The first synthesis of a chelating and reactive surfactant derived from citric acid and a short silicone as hydrophobic tail is described. Aqueous solutions of this reactive amphiphile spontaneously induce gold ion reduction, particle nucleation, and further direct crystal growth. The process, both pH and light dependent, occurs through lipid-directed assembly of metal ions, their reduction and subsequent lipid-directed growth to yield ultrathin (approximately 7 nm thick) quasi two-dimensional gold nanocrystals.
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Affiliation(s)
- Ferdinand Gonzaga
- Department of Chemistry, McMaster University 1280 Main Street West Hamilton, ON L8S4M1, Canada
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27
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Owen T, Webb SM, Butler A. XAS study of a metal-induced phase transition by a microbial surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:4999-5002. [PMID: 18442226 PMCID: PMC3068532 DOI: 10.1021/la703833v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The metal-induced micelle-to-vesicle phase change that the ferric complex of the microbially produced amphiphile, marinobactin E (M(E)), undergoes has been investigated by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). Marinobactin E is one member of the suite of siderophores, marinobactins A-E, that are used by the source bacterium to facilitate iron acquisition. Fe(III)-M(E) undergoes a micelle-to-multilamellar vesicle transition in the presence of Cd(II) and Zn(II). XRD measurements indicate the interlamellar repeat distance of the Cd(II)- and Zn(II)-induced multilamellar vesicles is approximately 5.3 nm. XAS spectra of the sedimented Cd(II)- and Zn(II)-induced multilamellar vesicles suggests hexadentate coordination of Cd(II) and Zn(II) consisting of two monodentate carboxylate ligands and four water ligands. This coordination environment supports the hypothesis that Cd(II) and Zn(II) bridge the terminal carboxylate moiety of two Fe(III)-M(E) headgroups, pulling the headgroups together in an arrangement that favors vesicle formation over the formation of micelles. XAS spectra of the Fe(III) center in the sedimented Cd(II)- and Zn(II)-induced vesicles confirm the anticipated six-coordinate geometry of Fe(III) by the M(E) headgroup via the two hydroxamate groups and the alpha-hydroxy amide moiety.
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28
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Bednarova L, Brandel J, d'Hardemare A, Bednar J, Serratrice G, Pierre JL. Vesicles to Concentrate Iron in Low-Iron Media: An Attempt to Mimic Marine Siderophores. Chemistry 2008; 14:3680-6. [DOI: 10.1002/chem.200701644] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Manning TJ, Thomas J, Osiro S, Smith J, Abadi G, Noble L, Phillips D. Computational studies of Fe(III) binding to bryostatins, bryostatin analogs, siderophores and marine natural products: arguments for ferric complexes in medicinal applications. Nat Prod Res 2008; 22:399-413. [DOI: 10.1080/14786410701590087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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30
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Owen T, Pynn R, Hammouda B, Butler A. Metal-dependent self-assembly of a microbial surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:9393-400. [PMID: 17655261 DOI: 10.1021/la700671p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Small-angle neutron scattering (SANS), cryogenic transmission electron microscopy (cryo-TEM), and dynamic light scattering (DLS) were used to study the metal-dependent phase behavior of microbially produced surfactants-marinobactins B, D, and E (MB, MD, and ME). Marinobactins A-E are siderophores that facilitate Fe(III) acquisition by the source bacterium through the coordination of Fe(III) by the peptidic headgroup. All of the marinobactins have the same six amino acid headgroup but differ in the length and saturation of the monoalkyl fatty acid tail. Fe(III) coordinated to ME (Fe(III)-ME) was found to form micelles with a diameter of approximately 3.5 nm that underwent a supramolecular transformation to produce a monodisperse population of vesicles with an average diameter ranging from approximately 90 to 190 nm upon addition of Cd(II), Zn(II), or La(III). SANS profiles of the transition-metal-induced phase exhibit a Bragg peak at QB approximately 0.11-0.12 A-1 and were fit to a SANS model for multilamellar vesicles that have an interbilayer repeat distance of 2pi/QB approximately 5.6-5.0 nm. Cryo-TEM images of the Zn(II)-induced phase reveals the presence of approximately 100 nm diameter approximately spherical aggregates of uniform electron density. The temperature dependence of the Zn(II)-induced transformation was also investigated as a function of the length and degree of unsaturation of the Fe(III)-marinobactin fatty acid tail. The Cd(II)-, Zn(II)-, and La(III)-induced phase changes have features that are similar to those of the previously reported Fe(III)-induced micelle-to-vesicle transition, and this observation has opened questions regarding the role that Cd(II) and Zn(II) may play in bacterial iron uptake.
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Affiliation(s)
- Tate Owen
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106-9510, USA
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31
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Martinez JS, Butler A. Marine amphiphilic siderophores: marinobactin structure, uptake, and microbial partitioning. J Inorg Biochem 2007; 101:1692-8. [PMID: 17868890 PMCID: PMC3061822 DOI: 10.1016/j.jinorgbio.2007.07.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2007] [Revised: 06/18/2007] [Accepted: 07/06/2007] [Indexed: 11/22/2022]
Abstract
Marinobactins A-E are a suite of amphiphilic siderophores which have a common peptidic head group that coordinates Fe(III), and a fatty acid which varies in length and saturation. As a result of the amphiphilic properties of these siderophores it is difficult to study siderophore-mediated uptake of iron, because the amphiphilic siderophores partition indiscriminately in microbial and other membranes. An alternative method to distinguish amphiphilic siderophore partitioning versus siderophore-mediated active uptake for Fe(III)-marinobactin E has been developed. In addition, a new member of the marinobactin family of siderophores is also reported, marinobactin F, which has a C(18) fatty acid with one double bond and which is substantially more hydrophobic that marinobactins A-E.
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Affiliation(s)
| | - Alison Butler
- To whom correspondence should be addressed: , FAX: (805) 893-4120
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32
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Cruz-Campa I, Arzola A, Santiago L, Parsons JG, Varela-Ramirez A, Aguilera RJ, Noveron JC. A novel class of metal-directed supramolecular DNA-delivery systems. Chem Commun (Camb) 2007:2944-6. [PMID: 17622439 DOI: 10.1039/b703201c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The bis-complexes [Cu(L(dt))(2)](OTf)(2) (1) and [Cu(L(ot))(2)](OTf)(2) (2), where L(dt) = 1-dodecyl-1,4,7-triazacyclononane, L(ot) = 1-octadecyl-1,4,7-triazacyclononane and OTf = trifluoromethanesulfonate, formed a novel class of metallo-liposomes in water that transfect pEGFP-N1 plasmids into HEK 293-T cells at 38% and 4% efficiency, respectively.
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Affiliation(s)
- Itzia Cruz-Campa
- Department of Chemistry, University of Texas, El Paso, TX 79968, USA
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33
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Zhang X, Li D. Metal-Compound-Induced Vesicles as Efficient Directors for Rapid Synthesis of Hollow Alloy Spheres. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200601617] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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34
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Zhang X, Li D. Metal-Compound-Induced Vesicles as Efficient Directors for Rapid Synthesis of Hollow Alloy Spheres. Angew Chem Int Ed Engl 2006; 45:5971-4. [PMID: 16897809 DOI: 10.1002/anie.200601617] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xuanjun Zhang
- Department of Chemistry and Multidisciplinary Research Center, Shantou University, Shantou 515063, PR China
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