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Corinti D, Crestoni ME, Chiavarino B, Fornarini S, Scuderi D, Salpin JY. Insights into Cisplatin Binding to Uracil and Thiouracils from IRMPD Spectroscopy and Tandem Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:946-960. [PMID: 32233383 PMCID: PMC7997577 DOI: 10.1021/jasms.0c00006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The monofunctional primary complexes cis-[PtCl(NH3)2(L)]+, formed by the reaction of cisplatin, a major chemotherapeutic agent, with four nucleobases L, i.e., uracil (U), 2-thiouracil (2SU), 4-thiouracil (4SU), and 2,4-dithiouracil (24dSU), have been studied by a combination of infrared multiple photon dissociation (IRMPD) action spectroscopy in both the fingerprint (900-1900 cm-1) and the N-H/O-H stretching (3000-3800 cm-1) ranges, energy-resolved collision-induced dissociation (CID) mass spectrometry, and density functional calculations at the B3LYP/LACVP/6-311G** level. On the basis of the comparison across the experimental features and the linear IR spectra of conceivable structures, the cisplatin residue is found to promote a monodentate interaction preferentially with the O4(S4) atoms of the canonical forms of U, 4SU, and 24dSU and to the S2 atom of 2SU, yielding the most stable structures. Additional absorptions reveal the presence of minor, alternative tautomers in the sampled ion populations of 2SU and 24dSU, underlying the ability of cisplatin to increase the prospect of (therapeutically beneficial) nucleic acid strand disorder. Implication of these evidence may provide insights into drug mechanism and design.
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Affiliation(s)
- Davide Corinti
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università
di Roma “La Sapienza”, P. le A. Moro 5, Roma 00185, Italy
| | - Maria Elisa Crestoni
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università
di Roma “La Sapienza”, P. le A. Moro 5, Roma 00185, Italy
| | - Barbara Chiavarino
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università
di Roma “La Sapienza”, P. le A. Moro 5, Roma 00185, Italy
| | - Simonetta Fornarini
- Dipartimento
di Chimica e Tecnologie del Farmaco, Università
di Roma “La Sapienza”, P. le A. Moro 5, Roma 00185, Italy
| | - Debora Scuderi
- Universite′
Paris-Saclay, CNRS, Institut de Chimie Physique
UMR8000, Orsay 91405, France
| | - Jean-Yves Salpin
- Université
Paris-Saclay, CNRS, Univ Evry,
LAMBE, Evry-Courcouronnes 91025, France
- CY
Cergy Paris Université, LAMBE, Evry-Courcouronnes 91025, France
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2
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Dikmen G, Alver Ö. Structural characterization of interaction between SWCNTs and 6-phenyl-2-thiouracil by molecular spectroscopic methods. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136734] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Structure, stability, energy barrier and ionization energies of chemically modified DNA-bases: Quantum chemical calculations on 37 favored and rare tautomeric forms of tetraphosphoadenine. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2014.11.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Structure and Stability of Chemically Modified DNA Bases: Quantum Chemical Calculations on 16 Isomers of Diphosphocytosine. ACTA ACUST UNITED AC 2013. [DOI: 10.1155/2013/146401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We studied for the first time 16 tautomers/rotamers of diphosphocytosine by four computational methods. Some of these tautomers/rotamers are isoenergetic although they have different structures. High-level electron correlation MP2 and MP4(SDQ) ab initio methods and density functional methods employing a B3LYP and the new M06-2X functional were used to study the structure and relative stability of 16 tautomers/rotamers of diphosphocytosine. The dienol tautomers of diphosphocytosine are shown to be much more stable than the keto-enol and diketo forms. The tautomers/rotamers stability could be ranked as PC3 = PC12 < PC2 = PC11 < PC1 < PC10 < PC8 < PC9 < PC15 < PC16 < PC6 ~ PC7 < PC13 < PC4 ~ PC14 < PC5. This stability order was discussed in the light of stereo and electronic factors. Solvation effect has been modeled in a high dielectric solvent, water using the polarized continuum model (PCM). Consideration of the solvent causes some reordering of the relative stability of diphosphocytosine tautomers: PC3 ~ PC12 ~ PC2 ~ PC11 < PC1 < PC10 < PC8 < PC9 < PC15 ~ PC16 < PC13 < PC6 ~ PC7 ~ PC14 < PC4 ~ PC5.
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WANG NANA, LI PING, HU YI, BU YUXIANG, WANG WEIHUA, XIE XIAOYAN. ASSOCIATION OF URACIL WITH Zn2+ AND THE HYDRATED Zn2+: A DFT INVESTIGATION. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633607002927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The association behaviors between Uracil and Zn 2+ in vacuum and in the presence of extra water molecules have been investigated systematically using the density functional theory (DFT). In these systems, the interaction of Zn 2+ with the carbonyl oxygen O 4 is systematically favored relative to O 2. For Uracil- Zn 2+ complexes, the more stable coordination mode among the possible complexes corresponds to the bidentate one, where the monodentate coordination mode is about 37 kcal/mol higher in energy relative to the bidentate case. Correspondingly, the stabilities of these structures are enhanced due to the formations of the four-membered chelate ring in the bidentate coordination processes. In the monodentate coordination complexes, the hydration effects are larger than those in the bidentate coordination complexes. The most basic center in the Uracil remains the same regardless of whether introducing the water molecules to Zn 2+ or not. The calculated Zn 2+ bonding energies in Uracil- Zn 2+( H 2 O ) complexes are reduced in comparison to those of the unhydrated Uracil- Zn 2+ complexes. Moreover, investigations of stepwise hydration of Zn 2+ in the most stable Uracil- Zn 2+ complex suggest that the successive hydration effect on the Zn 2+ site can enhance the strength of C = O bond in the Uracil- Zn 2+ complexes and reduce the association interaction of Uracil with Zn 2+. Additionally, the most acidic site of Uracil has been changed from N 1- to N 3– H group before and after introducing the Zn 2+ and there is a significant increase in the overall acidity of the system.
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Affiliation(s)
- NANA WANG
- Department of Chemistry, Qufu Normal University, Qufu, 273165, P. R. China
| | - PING LI
- Department of Chemistry, Qufu Normal University, Qufu, 273165, P. R. China
| | - YI HU
- High-performance Computational Center, Shandong University, Jinan, 250100, P. R. China
| | - YUXIANG BU
- Department of Chemistry, Qufu Normal University, Qufu, 273165, P. R. China
- Institute of Theoretical Chemistry, Shandong University, Jinan, 250100, P. R. China
| | - WEIHUA WANG
- Department of Chemistry, Qufu Normal University, Qufu, 273165, P. R. China
| | - XIAOYAN XIE
- Department of Chemistry, Qufu Normal University, Qufu, 273165, P. R. China
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Eizaguirre A, Mó O, Yáñez M, Boyd RJ. Effect of Sr2+association on the tautomerization processes of uracil and its dithio- and diseleno-derivatives. Org Biomol Chem 2011; 9:423-31. [DOI: 10.1039/c0ob00292e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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7
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Bartkowiak G, Wyrzykiewicz E, Schroeder G, Walkowiak A, Szponar A, Pawlak I. Thio Analogues of Pyrimidine Bases: Syntheses and Spectral Study of New Potentially Biologically Active 2,4-Di-Ortho-(Meta- and Para-)Bromo- (Chloro and Nitro)-Benzylthio-5-Bromouracils (and 6-Methyluracils). PHOSPHORUS SULFUR 2010. [DOI: 10.1080/10426500903061558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | | | - Anna Walkowiak
- a Faculty of Chemistry , Adam Mickiewicz University , Poznań, Poland
| | - Anna Szponar
- a Faculty of Chemistry , Adam Mickiewicz University , Poznań, Poland
| | - Ilona Pawlak
- a Faculty of Chemistry , Adam Mickiewicz University , Poznań, Poland
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Wang W, Wang N, Li P, Bu Y, Xie X, Song R. Theoretical studies on the properties of uracil and its dimer upon thioketo substitution. Theor Chem Acc 2008. [DOI: 10.1007/s00214-008-0442-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Trujillo C, Mó O, Yáñez M. A theoretical study of hydration effects on the prototropic tautomerism of selenouracils. Org Biomol Chem 2007; 5:3092-9. [PMID: 17878967 DOI: 10.1039/b708045j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The prototropic tautomerism of 2-, 4-selenouracil and 2,4-diselenouracil has been studied using density functional theory (DFT) methods, at the B3LYP/6-311 + G(3df,2p)//B3LYP/6-31G(d,p) level. The relative stability order of selenouracil tautomers does not resemble that of uracil tautomers, but it is similar to that of thiouracils, even though the energy gaps between the different tautomers of selenouracils are smaller than for thiouracils. The tautomerism activation barriers are high enough as to conclude that only the oxo-selenone or the diselenone structures should be found in the gas phase. The specific interaction with one water molecule reduces these barriers by a half, but still the oxo-selenone form is always the most stable tautomer. The addition of a second water molecule has a relatively small effect, as well as bulk effects, evaluated by means of a continuum-polarized model. For isolated 2- and 4-selenouracils, the more favorable tautomerization process corresponds to a hydrogen transfer towards the selenium atom, the activation barriers for transfer towards the oxygen atom being much higher. This situation changes when specific and bulk effects are included, and the latter process becomes the more favorable one. For 2,4-diselenouracil the more favorable tautomerization, in the gas phase, corresponds to the H shift from N1 to the Se atom at C2, while solvation effects favor the transfer from N3 to the Se atom at C4.
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Affiliation(s)
- Cristina Trujillo
- Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
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10
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Wyrzykiewicz E, Nowakowska Z. THIO ANALOGS OF PYRIMIDINE BASES: SYNTHESES AND EIMS STUDIES OF NEW 2-(AND 4-) O-(M- AND P-) HALOBENZYLTHIO-6-METHYLURACILS. PHOSPHORUS SULFUR 2006. [DOI: 10.1080/10426509608038813] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- ElŻBieta Wyrzykiewicz
- a Faculty of Chemistry , Adam Mickiewicz University , Grunwaldzka 6, 60-780, Poznań, Poland
| | - ZdzisŁAwa Nowakowska
- a Faculty of Chemistry , Adam Mickiewicz University , Grunwaldzka 6, 60-780, Poznań, Poland
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11
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Lamsabhi AM, Alcamí M, Mó O, Yáñez M, Tortajada J. Association of Cu2+with Uracil and Its Thio Derivatives: A Theoretical Study. Chemphyschem 2004; 5:1871-8. [PMID: 15648135 DOI: 10.1002/cphc.200400208] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The structures and relative stabilities of the complexes between Cu2+ and uracil, 2-thiouracil, 4-thiouracil, and 2,4-dithiouracil were investigated by B3LYP/6-311+G(2df,2p)//B3LYP/6-31G* DFT calculations. In those systems in which both types of basic centers, that is, a carbonyl and a thiocarbonyl group, are present, association of Cu2+ with the oxygen atom is systematically favored, in contrast to what was found for the corresponding Cu+ complexes. This can be understood by considering that association of Cu2+ is immediately followed by oxidation of the base, which accumulates the negative charge at the oxygen atoms. Similarly, for 2,4-dithiouracil the most basic site for Cu+ attachment is the sulfur atom at the 4-position, while for association of Cu2+ it is sulfur at the 2-position. In contrast, differences between uracil-Cu+ and uracil-Cu2+ complexes are very small, and in both cases the oxygen atom at the 4-position is the most basic. Cu2+ binding energies are about 4 and 1.2 times larger than Cu+ binding energies and proton affinities, respectively. Uracil- and thiouracil-Cu2+ complexes are thermodynamically unstable but kinetically stable with respect to their dissociation into uracil*+ + Cu+ or thiouracil*+ + Cu+. The Cu2+ binding energies vary with the difference between the second ionization potential of the metal and the first ionization potential of the base. regardless of the reference acid (H+, Cu+, Cu2+) the basicity trend is 2,4-dithiouracil > 4-thiouracil > 2-thiouracil > uracil.
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Affiliation(s)
- Al Mokhtar Lamsabhi
- Departamento de Química C-9, Facultad de Ciencias Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
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12
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Kryachko E, Nguyen MT, Zeegers-Huyskens T. Thiouracils: Acidity, Basicity, and Interaction with Water. J Phys Chem A 2001. [DOI: 10.1021/jp003703b] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eugene Kryachko
- Department of Chemistry, University of Leuven, 200F Celestijnenlaan, B-3001 Heverlee, Belgium
| | - Minh Tho Nguyen
- Department of Chemistry, University of Leuven, 200F Celestijnenlaan, B-3001 Heverlee, Belgium
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13
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Civcir P�. AM1 and PM3 studies of some thio analogues of pyrimidine bases in the gas and aqueous phases. J PHYS ORG CHEM 2001. [DOI: 10.1002/poc.349] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Kryachko ES, Nguyen MT. Thiouracils: Structures, tautomerism, interaction with water, and functioning in RNA and modified DNA base Pairs. ADVANCES IN QUANTUM CHEMISTRY 2001. [DOI: 10.1016/s0065-3276(01)40010-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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15
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Lamsabhi M, Alcamí M, Mó O, Bouab W, Esseffar M, Abboud JLM, Yáñez M. Are the Thiouracils Sulfur Bases in the Gas-phase? J Phys Chem A 2000. [DOI: 10.1021/jp000071k] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Lamsabhi
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
| | - M. Alcamí
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
| | - O. Mó
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
| | - W. Bouab
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
| | - M. Esseffar
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
| | - J. L.-M. Abboud
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
| | - M. Yáñez
- Departement de Chimie, Faculté des Sciences Semlalia Université Cadi Ayyad., Marrakech, Morocco, Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, and Instituto “Rocasolano”, C.S.I.C., Serrano, 119, 28006-Madrid, Spain
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Yekeler H. Ab initio study on tautomerism of 2-thiouracil in the gas phase and in solution. J Comput Aided Mol Des 2000; 14:243-50. [PMID: 10756479 DOI: 10.1023/a:1008132202838] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Ab initio geometry optimizations were carried out at the HF/3-21G and HF/6-31+G** levels for the six tautomeric forms of 2-thiouracil (2TU, 2TU1, 2TU2, 2TU3, 2TU4, 2TU5) in the gas phase and in solution. To obtain a more definitive estimate of the relative stabilities for 2-thiouracil tautomers in the gas phase, single-point MP2/6-31+G** calculations were performed on the HF/6-31+G** optimized geometries. The tautomeric equilibria in 1,4-dioxane (epsilon = 2.21), acetonitrile (epsilon = 38), and in water (epsilon = 78.54) were studied using the self-consistent reaction field (SCRF) theory. The calculated relative free energies indicated that 2TU is the energetically preferred tautomer in the gas phase and in solution. The stability order of 2-thiouracil tautomers depends on the level of theory and the dielectric constant of the solvent. The obtained results are compared with the available experimental data.
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Affiliation(s)
- H Yekeler
- Faculty of Science and Arts, Chemistry Department, Cumhuriyet University, Sivas, Turkey
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17
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Contreras JG, Alderete JB. Aqueous solvation effect on the prototropic tautomerism of 2-thiocytosine. J PHYS ORG CHEM 1995. [DOI: 10.1002/poc.610080603] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Semiempirical molecular orbital calculations on the prototropic tautomerism of 2-thiocytosine. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0166-1280(91)85143-u] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Abstract
The helical twist of poly d(A-s4T) was determined from the periodicity of the cleavage patterns of the double stranded polydeoxynucleotide adsorbed on calcium phosphate and found to be 14 bp per turn. Both cleavage patterns and 31P NMR spectra indicate a mononucleotide structure rather than an alternating B DNA like poly d(A-T). The failure of nucleosome formation excludes a B type structure. The discrepancy of the mononucleotide structure found in 31P NMR spectra and the dinucleotide structure given by X ray fiber diffraction is explained by an alternating tilt of the planes of the base pairs (base roll) as a consequence of a strong propeller twist. The importance of interstrand stacking interactions of adjacent 4-thiothymidines for the helical stability is discussed.
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20
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Hillen W, Gassen HG. Physical and coding properties of poly(5-methoxyuridylic) acid. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 562:207-13. [PMID: 375983 DOI: 10.1016/0005-2787(79)90166-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The synthesis of poly(mo5U) requires a high concentration (2.7 mg/ml) of polynucleotide phosphorylase as well as a long reaction time (48 h). The resulting polynucleotide has a chain length of approximately 100 nucleotides. It shows no indication of a stable secondary structure. When poly(mo5U) is mixed with poly(A), a triple-stranded complex poly(A) . 2poly(mo5U) is formed. This complex has a melting temperature of 68.5 +/- 0.5 degrees C at 150 mMNa+ and exhibits a hysteresis loop between melting and reformation of the complex having a delta Tm of 11.5 degrees C. Poly-5-methoxyuridylic acid stimulates the binding of Phe-tRNA to 70-S ribosomes but is inactive in directing poly(Phe) synthesis.
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21
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Wulff K. [Polydeoxynucleotides as DNA models]. THE SCIENCE OF NATURE - NATURWISSENSCHAFTEN 1974; 61:434-40. [PMID: 4138921 DOI: 10.1007/bf00597202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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22
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Codon—Anticodon interaction studied with trinucleoside diphosphates containing 2-thiouridine, 4-thiouridine, 2,4-dithiouridine, or 2-thiocytidine. ACTA ACUST UNITED AC 1974. [DOI: 10.1016/0005-2787(74)90280-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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23
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Geller M, Pohorille A, Jaworski A. Electronic structure of thiouracils and their interaction with adenine. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 331:1-8. [PMID: 4761101 DOI: 10.1016/0005-2787(73)90412-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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24
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Zipper P. A small-angle- x-ray scattering study on poly (d(A-t)-d(A-T)), poly(d(A-s4T)-d(A-s4T)) and poly (d(A-s4U)-d(A-s4U)). EUROPEAN JOURNAL OF BIOCHEMISTRY 1973; 39:493-8. [PMID: 4544117 DOI: 10.1111/j.1432-1033.1973.tb03148.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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25
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Rhode W, Lezius AG. Synthesis and properties of an alternating polydeoxynucleotide containing 4-thiodeoxyuridine: poly (d(A S 4 U)-d(A-S 4 U)). BIOCHIMICA ET BIOPHYSICA ACTA 1973; 308:361-5. [PMID: 4351153 DOI: 10.1016/0005-2787(73)90328-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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26
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27
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28
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Saenger W, Suck D. The relationship between hydrogen bonding and base stacking in crystalline 4-thiouridine derivatives. EUROPEAN JOURNAL OF BIOCHEMISTRY 1973; 32:473-8. [PMID: 4692221 DOI: 10.1111/j.1432-1033.1973.tb02630.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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29
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Bähr W, Sommer H, Scheit KH. Synthesis and properties of oligodeoxy-4-thiothymidylic acid. BIOCHIMICA ET BIOPHYSICA ACTA 1972; 287:427-37. [PMID: 4345027 DOI: 10.1016/0005-2787(72)90286-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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30
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Beikirch HH, Lezius AG. Double-stranded polydeoxyribonucleotides containing 6-thiodeoxyguanosine and 6-thiodeoxyinosine. Poly(d(A-C)-d(T-s 6 G)),poly(d(A-s 6 G)-d(T-C)) and poly(d(A-C)-d(T-s 6 I)). EUROPEAN JOURNAL OF BIOCHEMISTRY 1972; 27:381-7. [PMID: 4559264 DOI: 10.1111/j.1432-1033.1972.tb01848.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Lezius A. Über die dynamische Struktur einer synthetischen Desoxyribonucleinsäure. Angew Chem Int Ed Engl 1972. [DOI: 10.1002/ange.19720840829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lezium AG, Rath U. Synthesis of poly (d(A-s 4 T)-d(A-s 4 T)) by Bacillus subtilis DNA polymerase. EUROPEAN JOURNAL OF BIOCHEMISTRY 1971; 24:163-7. [PMID: 5003031 DOI: 10.1111/j.1432-1033.1971.tb19667.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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