1
|
Phleomycin complex – Coordination mode and in vitro cleavage of DNA. J Inorg Biochem 2019; 195:71-82. [DOI: 10.1016/j.jinorgbio.2019.03.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/15/2019] [Accepted: 03/10/2019] [Indexed: 11/21/2022]
|
2
|
Follett SE, Murray SA, Ingersoll AD, Reilly TM, Lehmann TE. Structural changes of Zn(II)bleomycin complexes when bound to DNA hairpins containing the 5'-GT-3' and 5'-GC-3' binding sites studied through NMR spectroscopy. MAGNETOCHEMISTRY 2018; 4. [PMID: 30464999 DOI: 10.3390/magnetochemistry4010004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Bleomycins are antitumor antibiotics that can chelate a metal center and cause site-specific DNA cleavage at 5'-Gpyrimidine-3' regions of DNA. These antibiotics are successful in the treatment of various cancers, but are known to cause pulmonary fibrosis to patients under bleomycin regimes. Substantial research has resulted in the development of over 300 bleomycin analogs, aiming to improve the therapeutic index of the drug. Previous studies have proposed that the lung toxicity caused by bleomycin is related to the C-terminal regions of these drugs, which have been shown to closely interact with DNA in metal-bleomycin-DNA complexes. Some of the research studying metallo-bleomycin-DNA interactions have suggested three different binding modes of the metal form of the drug to DNA, including total and/or partial intercalation, and minor groove binding. However, there is still lack of consensus regarding this matter, and solid conclusions on the subject have not yet been established. Previously we investigated the diverse levels of disruption caused to DNA hairpins containing 5'-GC-3' and 5'-GT-3' binding sites, which are consequence of the binding of bleomycins with different C-termini. The results of these investigation indicate that both the DNA-binding site and the bleomycin C-termini have an impact on the final conformations of drug and target. The present study focuses on the structural alterations exhibited by Zn(II)bleomycin-A2, -B2, -A5 and Zn(II)peplomycin upon binding to DNA hairpins containing 5'-GC-3' and 5'-GT-3' binding sites. Evidence that each Zn(II)bleomycin is structurally affected depending on both its C-terminus and the DNA-binding site present in the hairpin is provided.
Collapse
Affiliation(s)
- Shelby E Follett
- Department of Chemistry, University of Wyoming, Laramie, WY, United Sates of America
| | - Sally A Murray
- Department of Chemistry, University of Wyoming, Laramie, WY, United Sates of America
| | - Azure D Ingersoll
- Department of Chemistry, University of Wyoming, Laramie, WY, United Sates of America
| | - Teresa M Reilly
- Department of Chemical Engineering, University of Wyoming, Laramie, WY, United Sates of America
| | - Teresa E Lehmann
- Department of Chemistry, University of Wyoming, Laramie, WY, United Sates of America
| |
Collapse
|
3
|
Follett SE, Ingersoll AD, Murray SA, Reilly TM, Lehmann TE. Interaction of Zn(II)bleomycin-A 2 and Zn(II)peplomycin with a DNA hairpin containing the 5'-GT-3' binding site in comparison with the 5'-GC-3' binding site studied by NMR spectroscopy. J Biol Inorg Chem 2017; 22:1039-1054. [PMID: 28748309 PMCID: PMC5985968 DOI: 10.1007/s00775-017-1482-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 07/13/2017] [Indexed: 11/29/2022]
Abstract
Bleomycins are a group of glycopeptide antibiotics synthesized by Streptomyces verticillus that are widely used for the treatment of various neoplastic diseases. These antibiotics have the ability to chelate a metal center, mainly Fe(II), and cause site-specific DNA cleavage. Bleomycins are differentiated by their C-terminal regions. Although this antibiotic family is a successful course of treatment for some types of cancers, it is known to cause pulmonary fibrosis. Previous studies have identified that bleomycin-related pulmonary toxicity is linked to the C-terminal region of these drugs. This region has been shown to closely interact with DNA. We examined the binding of Zn(II)peplomycin and Zn(II)bleomycin-A2 to a DNA hairpin of sequence 5'-CCAGTATTTTTACTGG-3', containing the binding site 5'-GT-3', and compared the results with those obtained from our studies of the same MBLMs bound to a DNA hairpin containing the binding site 5'-GC-3'. We provide evidence that the DNA base sequence has a strong impact in the final structure of the drug-target complex.
Collapse
Affiliation(s)
- Shelby E Follett
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Azure D Ingersoll
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Sally A Murray
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Teresa M Reilly
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Teresa E Lehmann
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA.
| |
Collapse
|
4
|
Lehmann TE, Murray SA, Ingersoll AD, Reilly TM, Follett SE, Macartney KE, Harpster MH. NMR study of the effects of some bleomycin C-termini on the structure of a DNA hairpin with the 5'-GC-3' binding site. J Biol Inorg Chem 2016; 22:121-136. [PMID: 27858165 DOI: 10.1007/s00775-016-1413-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 11/10/2016] [Indexed: 11/28/2022]
Abstract
The antibiotics known as bleomycins constitute a family of natural products clinically employed for the treatment of a wide spectrum of cancers. The drug acts as an antitumor agent by virtue of the ability of a metal complex of the antibiotic to cleave DNA. Bleomycins are differentiated by their C-terminal regions. Previous structural studies involving metal-bleomycin-DNA triads have allowed the identification of the bithiazole-(C-terminus substituent) segment in this molecule as the one that most closely interacts with DNA. Three different modes of binding of metallo-bleomycins to DNA (partial or total intercalation of the bithiazole unit between DNA bases, or binding to the minor groove) have been proposed in the literature. The therapeutic use of bleomycin is frequently associated with the development of pulmonary fibrosis. The severity of this side effect has been attributed to the C-terminus of the antibiotic by some researchers. The degree of pulmonary toxicity of bleomycin-A2 and -A5, were found to be higher than those of bleomycin-B2 and peplomycin. Since the introduction of Blenoxane to clinical medicine in 1972, attempts have been made at modifying the basic bleomycin structure at the C-terminus to improve its therapeutic index. However, the pharmacological and toxicological importance of particular C-termini on bleomycin remains unclear. The present study was designed to determine the effect of Zn(II)bleomycin-A2, -A5, -B2, and Zn(II)peplomycin on the structure of a DNA hairpin containing the 5'-GC-3' binding site. We provide evidence that different Zn(II)bleomycins affect the structure of the tested DNA segment in different fashions.
Collapse
Affiliation(s)
- Teresa E Lehmann
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA.
| | - Sally A Murray
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Azure D Ingersoll
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Teresa M Reilly
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Shelby E Follett
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Kevin E Macartney
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| | - Mark H Harpster
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA
| |
Collapse
|
5
|
Coughlin JM, Rudolf JD, Wendt-Pienkowski E, Wang L, Unsin C, Galm U, Yang D, Tao M, Shen B. BlmB and TlmB provide resistance to the bleomycin family of antitumor antibiotics by N-acetylating metal-free bleomycin, tallysomycin, phleomycin, and zorbamycin. Biochemistry 2014; 53:6901-9. [PMID: 25299801 PMCID: PMC4230324 DOI: 10.1021/bi501121e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The bleomycin (BLM) family of glycopeptide-derived
antitumor antibiotics
consists of BLMs, tallysomycins (TLMs), phleomycins (PLMs), and zorbamycin
(ZBM). The self-resistant elements BlmB and TlmB, discovered from
the BLM- and TLM-producing organisms Streptomyces verticillus ATCC15003 and Streptoalloteichus hindustanus E465-94
ATCC31158, respectively, are N-acetyltransferases
that provide resistance to the producers by disrupting the metal-binding
domain of the antibiotics required for activity. Although each member
of the BLM family of antibiotics possesses a conserved metal-binding
domain, the structural differences between each member, namely, the
bithiazole moiety and C-terminal amine of BLMs, have been suggested
to instill substrate specificity within BlmB. Here we report that
BlmB and TlmB readily accept and acetylate BLMs, TLMs, PLMs, and ZBM in vitro but only in the metal-free forms. Kinetic analysis
of BlmB and TlmB reveals there is no strong preference or rate enhancement
for specific substrates, indicating that the structural differences
between each member of the BLM family play a negligible role in substrate
recognition, binding, or catalysis. Intriguingly, the zbm gene cluster from Streptomyces flavoviridis ATCC21892
does not contain an N-acetyltransferase, yet ZBM
is readily acetylated by BlmB and TlmB. We subsequently established
that S. flavoviridis lacks the homologue of BlmB
and TlmB, and ZbmA, the ZBM-binding protein, alone is sufficient to
provide ZBM resistance. We further confirmed that BlmB can indeed
confer resistance to ZBM in vivo in S. flavoviridis, introduction of which into wild-type S. flavoviridis further increases the level of resistance.
Collapse
Affiliation(s)
- Jane M Coughlin
- Division of Pharmaceutical Sciences, University of Wisconsin-Madison , Madison, Wisconsin 53705, United States
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Lehmann T, Topchiy E. Contributions of NMR to the understanding of the coordination chemistry and DNA interactions of metallo-bleomycins. Molecules 2013; 18:9253-77. [PMID: 23917114 PMCID: PMC6270211 DOI: 10.3390/molecules18089253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 07/27/2013] [Accepted: 07/29/2013] [Indexed: 11/20/2022] Open
Abstract
Bleomycins are a family of glycopeptide antibiotics that have the ability to bind and degrade DNA when bound to key metal ions, which is believed to be responsible for their antitumor activity. Knowledge of the structures of metallo-bleomycins is vital to further characterize their mechanism of action. To this end, numerous structural studies on metallo-bleomycins have been conducted. NMR spectroscopy has had a key role in most of these studies, and has led to very important findings involving the coordination chemistry of metallo-bleomycins, and the details of many metallo-bleomycin-DNA spatial correlations for this important drug. This paper reviews the most important contributions of NMR to the bleomycin field.
Collapse
Affiliation(s)
- Teresa Lehmann
- Department of Chemistry, University of Wyoming, Laramie, WY 82071, USA.
| | | |
Collapse
|
7
|
Li Y, Lehmann T. Coordination chemistry and solution structure of Fe(II)-peplomycin. Two possible coordination geometries. J Inorg Biochem 2012; 111:50-8. [PMID: 22484500 DOI: 10.1016/j.jinorgbio.2012.02.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Revised: 02/23/2012] [Accepted: 02/24/2012] [Indexed: 11/19/2022]
Abstract
The solution structure of Fe(II)-peplomycin was determined from NMR data collected for this molecule. As found previously for Fe(II)- and Co(II)-bound bleomycin; the coordination sphere of the metal is composed of the primary and secondary amines in β-aminoalanine, the pyrimidine and imidazole rings in the pyrimidinylpropionamide, and β-hydroxyhistidine moieties, respectively, the amine nitrogen in β-hydroxyhistidine, and either the carbamoyl group in mannose or a solvent molecule. The two most discussed coordination geometries for the aforementioned ligands in metallo-bleomycins have been tested against the NMR data generated for Fe(II)-peplomycin. The interpretation of the experimental evidence obtained through molecular dynamics indicates that both geometries are equally likely in solution for this compound in the absence of DNA, but arguments are offered to explain why one of these geometries is preferred in the presence of DNA.
Collapse
Affiliation(s)
- Yang Li
- Department of Chemistry, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, United States
| | | |
Collapse
|
8
|
Lehmann T, Li Y. Solution structure of Fe(II)–azide–bleomycin derived from NMR data: transition from Fe(II)–bleomycin to Fe(II)–azide–bleomycin as derived from NMR data and structural calculations. J Biol Inorg Chem 2012; 17:761-71. [PMID: 22481631 DOI: 10.1007/s00775-012-0894-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Accepted: 03/18/2012] [Indexed: 10/28/2022]
|
9
|
Chakravarty AR, Roy M. Photoactivated DNA Cleavage and Anticancer Activity of 3d Metal Complexes. PROGRESS IN INORGANIC CHEMISTRY 2011. [DOI: 10.1002/9781118148235.ch3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
10
|
Lehmann TE, Li Y. Possible structural role of the disaccharide unit in Fe-bleomycin before and after oxygen activation. J Antibiot (Tokyo) 2011; 65:25-33. [PMID: 22068157 DOI: 10.1038/ja.2011.103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
11
|
Pitié M, Pratviel G. Activation of DNA Carbon−Hydrogen Bonds by Metal Complexes. Chem Rev 2010; 110:1018-59. [DOI: 10.1021/cr900247m] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Marguerite Pitié
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, and Université de Toulouse, Toulouse, France
| | - Geneviève Pratviel
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, and Université de Toulouse, Toulouse, France
| |
Collapse
|
12
|
Karawajczyk A, Buda F. The anticancer drug bleomycin investigated by density functional theory. MOLECULAR SIMULATION 2006. [DOI: 10.1080/08927020601101083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
13
|
Karawajczyk A, Buda F. The metal bonding domain of the antitumor drug Fe(II)-bleomycin: a DFT investigation. J Biol Inorg Chem 2004; 10:33-40. [PMID: 15578242 DOI: 10.1007/s00775-004-0610-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2004] [Accepted: 10/21/2004] [Indexed: 10/26/2022]
Abstract
The geometric and electronic structure of ferrous complexes of bleomycin (Fe(II)BLM) has been investigated by means of density functional theory (DFT) calculations. The active site of this antitumor drug is a highly distorted octahedral complex, with the coordination sphere completed by the five known endogenous ligands, including pyrimidine, imidazole, deprotonated amide, and secondary and primary amines. We have addressed the controversial issue of the nature of the sixth axial ligand, which we have identified as the oxygen of the carbamoyl group. Our conclusions are further validated by a comparison with structural data derived from NMR experiments. Moreover, because of the high sensitivity of structural data on the pH of the environment, we have investigated the effect of a different protonation state of the histidine amide on the geometric structure of the Fe(II)BLM complex. The extensive model of the active site of bleomycin considered in this work allows us to check the limitations of previous investigations based on simplified models.
Collapse
Affiliation(s)
- Anna Karawajczyk
- Leiden Institute of Chemistry, Gorlaeus Laboratories, 2300 RA Leiden, The Netherlands
| | | |
Collapse
|
14
|
Papakyriakou A, Bratsos I, Katsarou M, Katsaros N. Preparation, Structure Determination and Cytotoxicity of the Pd
II
·Bleomycin A2 Complex. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200400034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Athanasios Papakyriakou
- Institute of Physical Chemistry, NCSR “Demokritos”, 153 10 Ag. Paraskevi Attikis, Greece, Fax: (internat.) + 30‐210‐6511766
| | - Ioannis Bratsos
- Institute of Physical Chemistry, NCSR “Demokritos”, 153 10 Ag. Paraskevi Attikis, Greece, Fax: (internat.) + 30‐210‐6511766
| | - Maria Katsarou
- Institute of Physical Chemistry, NCSR “Demokritos”, 153 10 Ag. Paraskevi Attikis, Greece, Fax: (internat.) + 30‐210‐6511766
| | - Nikos Katsaros
- Institute of Physical Chemistry, NCSR “Demokritos”, 153 10 Ag. Paraskevi Attikis, Greece, Fax: (internat.) + 30‐210‐6511766
| |
Collapse
|
15
|
Lehmann TE. Structural study of copper(I)-bleomycin. J Biol Inorg Chem 2004; 9:323-34. [PMID: 15015041 DOI: 10.1007/s00775-004-0530-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2003] [Accepted: 02/12/2004] [Indexed: 11/29/2022]
Abstract
Previous NMR studies on Cu(I)-bleomycin have suggested that this adduct has a geometry distinct from Fe(II)BLM. The coordination chemistry of this bleomycin derivative has been investigated through the extension of the NMR data reported previously, and the use of molecular dynamics calculations. The data collected from the NMR experiments support the coordination to the metal center of the primary and secondary amines in beta-aminoalanine and the pyrimidine ring. The detection in the NMR spectra of the signal derived from the amide hydrogen in beta-hydroxyhistidine indicates that this amide is protonated in Cu(I)-bleomycin, precluding participation of the pyrimidinyl carboxamide nitrogen in the coordination of Cu(I), as previously reported. Three-dimensional solution structures compatible with the NMR data have been assayed for Cu(I)-bleomycin for the first time by way of molecular dynamics calculations, and two models showing four and five coordination have been found to be those that better fit the experimental data. In both models the primary amine in beta-aminoalanine is coordinated such that it is located on the same side, with respect to the coordination cage, as the peptide linker fragment. This result seems important for the favored models to be compatible with either their possible oxidation to become one of the reported structures for Cu(II)BLM, or their transformation into Fe(II) adducts able to cause DNA damage.
Collapse
Affiliation(s)
- Teresa E Lehmann
- Laboratorio de Análisis Instrumental, Centro de Química, Instituto Venezolano de Investigaciones Científicas (IVIC), 1090, Caracas, Venezuela.
| |
Collapse
|
16
|
Smolentsev G, Soldatov AV, Wasinger EC, Solomon EI. Axial Ligation of Fe(II)−Bleomycin Probed by XANES Spectroscopy. Inorg Chem 2004; 43:1825-7. [PMID: 15018497 DOI: 10.1021/ic0350537] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Full multiple scattering calculations of the Fe K-edge X-ray absorption near edge structure of bleomycin have been performed. Structural insight is based on the comparison between experimental and theoretical data calculated for different active site models coming from NMR-informed molecular dynamic simulations. In all models considered, the equatorial ligands (secondary amine in beta-aminoalanine, pyrimidine and imidazole rings and the beta-hydroxyhistidine) were left unchanged. Seven models with two axial ligands (the primary amine in beta-aminoalanine and the carbomoyl group of the mannose or a solvent molecule) were tested. The best agreement between theoretical and experimental spectra is achieved for the model of bleomycin with the primary amine and the oxygen of the mannose sugar occupying the axial positions. The coordination environment is characterized by serious distortions of the Fe octahedron, including the presence of one ligand with a very short bond length and significant angular distortions.
Collapse
Affiliation(s)
- Grigory Smolentsev
- Department of Physics, Rostov State University, Rostov-on-Don, 344090 Russia
| | | | | | | |
Collapse
|
17
|
Abstract
Although most antibiotics do not need metal ions for their biological activities, there are a number of antibiotics that require metal ions to function properly, such as bleomycin (BLM), streptonigrin (SN), and bacitracin. The coordinated metal ions in these antibiotics play an important role in maintaining proper structure and/or function of these antibiotics. Removal of the metal ions from these antibiotics can cause changes in structure and/or function of these antibiotics. Similar to the case of "metalloproteins," these antibiotics are dubbed "metalloantibiotics" which are the title subjects of this review. Metalloantibiotics can interact with several different kinds of biomolecules, including DNA, RNA, proteins, receptors, and lipids, rendering their unique and specific bioactivities. In addition to the microbial-originated metalloantibiotics, many metalloantibiotic derivatives and metal complexes of synthetic ligands also show antibacterial, antiviral, and anti-neoplastic activities which are also briefly discussed to provide a broad sense of the term "metalloantibiotics."
Collapse
Affiliation(s)
- Li-June Ming
- Department of Chemistry and Institute for Biomolecular Science, University of South Florida, Tampa, Florida 33620-5250, USA.
| |
Collapse
|
18
|
Papakyriakou A, Katsaros N. NMR and Molecular Modelling Studies on the Solution Structure of the In
III
−Bleomycin A2 Complex. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Athanasios Papakyriakou
- Institute of Physical Chemistry, NCSR “Demokritos” 15310 Ag. Paraskevi Attikis, Greece, Fax: (internat.) + 30‐210/6511766
| | - Nikos Katsaros
- Institute of Physical Chemistry, NCSR “Demokritos” 15310 Ag. Paraskevi Attikis, Greece, Fax: (internat.) + 30‐210/6511766
| |
Collapse
|
19
|
Papakyriakou A, Mouzopoulou B, Katsaros N. The solution structure of the Ga(III)-bleomycin A2 complex resolved by NMR and molecular modeling; interaction with d(CCAGGCCTGG). J Biol Inorg Chem 2003; 8:549-559. [PMID: 12632272 DOI: 10.1007/s00775-003-0448-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2002] [Accepted: 01/23/2003] [Indexed: 10/18/2022]
Abstract
The solution structure of the Ga(III)-bleomycin A2 complex (GaBLM) has been determined using 2D NMR methods in combination with molecular dynamics calculations. Complete assignment of the amide and amine protons, observation of 80 NOEs and measurement of 15 (3)JH(-H) coupling constants provided us with a well-defined structure using a restrained simulated annealing protocol. On the basis of distance and dihedral angle constraints agreement, along with potential energy considerations, the favored model is a five-coordinate complex with the primary amine of beta-aminoalanine holding the axial position of a distorted tetragonal pyramid. The disaccharide moiety of GaBLM is not a ligand, sharing the same side of the equatorial plane with the axial amine ligand. Titration of the self-complementary oligonucleotide d(CCAGGCCTGG) with GaBLM results in the formation of only one 1:1 complex in slow exchange on the NMR time scale. Our data indicate that the bithiazole moiety intercalates between the C6*G15 and C7*G14 base pairs, in a similar mode to that reported by earlier studies. Structural implications and comparisons to other metallo-bleomycins are discussed.
Collapse
Affiliation(s)
- Athanasios Papakyriakou
- Institute of Physical Chemistry, NCSR "Demokritos", 153-10 Ag. Paraskevi Attikis, Athens, Greece
| | - Barbara Mouzopoulou
- Institute of Physical Chemistry, NCSR "Demokritos", 153-10 Ag. Paraskevi Attikis, Athens, Greece
| | - Nikos Katsaros
- Institute of Physical Chemistry, NCSR "Demokritos", 153-10 Ag. Paraskevi Attikis, Athens, Greece.
| |
Collapse
|
20
|
Papakyriakou A, Bratsos I, Katsaros N. Structural studies on metallobleomycins: The interaction of Pt(II) and Pd(II) with bleomycin. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2003. [DOI: 10.2298/jsc0305339p] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Two of the most successful chemotherapeutic agents used in the treatment of several neoplasias are bleomycin and cisplatin. Both drugs attack the DNA leading to the cancer cells death via different mechanisms. In view of the fact that the combination with each other leads to enhanced activity with less sever side effects, we have undertaken NMR studies on the complexes formed between bleomycin and PtII, PdII, cisplatin and transplatin. Herein we present a brief review of the studies on metallobleomycins which were carried out by our lab and others, as an outline of the results obtained using NMR in combination to circular dichroism spectroscopy. Our data indicate that in most cases and under several conditions studied, both metal ions form similar complexes with BLM while more than one species are present in the solution. Structural implications and comparisons with other metallobleomycins are being discussed. .
Collapse
Affiliation(s)
- Athanasios Papakyriakou
- Institute of Physical Chemistry, NCSR 'Demokritos' 153-10 Ag. Paraskevi Attikis, Athens, Greece
| | - Ioannis Bratsos
- Institute of Physical Chemistry, NCSR 'Demokritos' 153-10 Ag. Paraskevi Attikis, Athens, Greece
| | - Nikos Katsaros
- Institute of Physical Chemistry, NCSR 'Demokritos' 153-10 Ag. Paraskevi Attikis, Athens, Greece
| |
Collapse
|
21
|
Coordination of {RuII(NO+)}3+ and {RuII(H2O)}2+ to bleomycin: most favored [RuII(L)(BLM-A2)] structure according to 1H NMR and molecular mechanics methods. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(02)01174-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
22
|
Neese F, Zaleski JM, Loeb Zaleski K, Solomon EI. Electronic Structure of Activated Bleomycin: Oxygen Intermediates in Heme versus Non-Heme Iron. J Am Chem Soc 2000. [DOI: 10.1021/ja001812y] [Citation(s) in RCA: 125] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frank Neese
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Jeffrey M. Zaleski
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Kelly Loeb Zaleski
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| | - Edward I. Solomon
- Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305-5080
| |
Collapse
|