Bioinorganic chemistry最新文献_第5页

Coordination of imidazole by hemin in organic and aqueous organic solvents 咪唑与hemin在有机和水有机溶剂中的配位

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80132-5

Paul A. Adams, David A. Baldwin, Carol E. Hepner, John M. Pratt

引用次数: 11

Spectral and Electron Paramagnetic Resonance Investigations of Copper(II) Complexes of Linear-Chain Fatty Diacids 线性链脂肪酸铜(II)配合物的光谱和电子顺磁共振研究

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)82002-5

Patrick Sharrock, Michele Dartiguenave, Yves Dartiguenave

{"title":"Spectral and Electron Paramagnetic Resonance Investigations of Copper(II) Complexes of Linear-Chain Fatty Diacids","authors":"Patrick Sharrock, Michele Dartiguenave, Yves Dartiguenave","doi":"10.1016/S0006-3061(00)82002-5","DOIUrl":"10.1016/S0006-3061(00)82002-5","url":null,"abstract":"<div>Electron paramagnetic resonance spectra of polycrystalline copper complexes of butanedioic, pentanedioic, hexanedioic, heptanedioic, and decanedioic acids are presented, together with 77 K electronic spectra. The complexes are formulated as dimeric copper carboxylate units linked into infinite chains. Monomer impurities are also present and increase in quantity with the length of the diacid. The monomer and dimer signals occur at very different field strengths, but the g values calculated from the S = <math><mtext>1</mtext><mtext>2</mtext></math> spectra are similar to those calculated from the S = 1 spectra. The EPR method can thus be used to locate copper ions in possible biological frameworks and to study the geometry around the metal sites. The distortion from axial symmetry around the copper increases with the length of the diacid, as shown by the observed zero-field splitting parameters. Gaussian analysis of the optical absorptions yields information used with EPR data to calculate covalency and Fermi contact terms. Sodium, potassium, and lithium salts transform the dimeric polymers into monomeric polymers. The presence of magnetic exchange interactions in copper dicarboxylates is discussed and thereby shown to be of interest in the study of copper ions in molecules of biological importance containing carboxylate groups.</div>","PeriodicalId":9177,"journal":{"name":"Bioinorganic chemistry","volume":"9 1","pages":"Pages 3-21"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0006-3061(00)82002-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11426972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

On internal electron transfer in xanthine oxidase 黄嘌呤氧化酶内部电子传递的研究

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80289-6

James R. Fischer, James K. Hurst

引用次数: 3

Inhibition of the RNA dependent DNA polymerase and the malignant transforming ability of Rous sarcoma virus by thiosemicarbazone-transition metal complexes 硫代氨基脲-过渡金属配合物抑制RNA依赖性DNA聚合酶及劳斯肉瘤病毒的恶性转化能力

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80198-2

William C. Kaska , Carl Carrano , Joseph Michalowski , Jean Jackson , Warren Levinson

引用次数: 48

Effect of tyrosine residues on complexing of copper(II) by sulfhydryl-containing tripeptides: Its implication for tyrosine residues in blue copper proteins 酪氨酸残基对含巯基三肽络合铜(II)的影响:对蓝铜蛋白中酪氨酸残基的影响

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80135-0

Yukio Sugiura, Yoshinobu Hirayama

引用次数: 0

Nonenzymatic hydrolysis reactions of adenosine 5′-triphosphate and its related compounds—III: Catalytic aspects of some cobalt(III) complexes in ATP-hydrolysis 5 ' -三磷酸腺苷及其相关化合物III的非酶解反应:一些钴(III)配合物在atp水解中的催化作用

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80162-3

Shinnichiro Suzuki , Tadayoshi Higashiyama , Akitsugu Nakahara

引用次数: 9

Interaction of antibiotic lasalocid A (X537A) with praseodymium(III) in methanol 抗生素lasalocid A (X537A)与镨(III)在甲醇中的相互作用

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80284-7

Shuenn-tzong Chen, Charles S. Springer Jr.

引用次数: 14

Apparent stability constants of H+ and Mg2+ complexes of 5-phosphoribosyl α-1-pyrophosphate 5-磷酸核糖基α-1-焦磷酸H+和Mg2+配合物的表观稳定性常数

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)82004-9

Richard E. Thompson , Edwin L.-F. Li, H. Olin Spivey, John P. Chandler, Alan J. Katz , James R. Appleman

{"title":"Apparent stability constants of H+ and Mg2+ complexes of 5-phosphoribosyl α-1-pyrophosphate","authors":"Richard E. Thompson , Edwin L.-F. Li, H. Olin Spivey, John P. Chandler, Alan J. Katz , James R. Appleman","doi":"10.1016/S0006-3061(00)82004-9","DOIUrl":"10.1016/S0006-3061(00)82004-9","url":null,"abstract":"<div>Apparent Mg2+ and H+ stability constants of 5-phosphoribosyl α-1-pyrophosphate (ligand, L) complexes were determined from pH titration data at 25°C with an average of 0.17 M NaCl or KCl and 0.20 M ionic strength. The logarithms of calculated macroscopic overall stability constants are: 3.2 (MgL3-), 4.8 (Mg2L-), 6.5 (HL4-), 12.4 (H2L3-), 9.4 (MgHL2-), and 11.0 (MgH2L). Comparison of the stepwise Mg2+ stability constants (log k = 3.2 and 1.6) with those of MgADP- and MgAMP or Mg-hexose-1-P suggests that the first and second Mg2+ bind to the 1-PP and 5-P groups of the ligand, respectively. Reasonable assumptions about relative microscopic constants indicate that several of the microscopic isomers do not achieve significant concentrations over a large range of conditions. Judging from other data on organophosphate complexes, it is likely that the constants of this study may be extrapolated with little error to other conditions of ionic strength 0.1–0.2 M) and temperature (e.g., 15–35°C), and widely different monovalent ion concentrations.</div>","PeriodicalId":9177,"journal":{"name":"Bioinorganic chemistry","volume":"9 1","pages":"Pages 35-45"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0006-3061(00)82004-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11251532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Substitution reactions of a water-soluble metalloporphyrin with azide and 1,1,3,3-tetramethyl-2-thiourea 水溶性金属卟啉与叠氮化物和1,1,3,3-四甲基-2-硫脲的取代反应

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80003-4

Robert F. Pasternack, Bruce S. Gillies, Julia P. Stromsted

引用次数: 8

MCD spectra of iron-sulfur complexes with or without inorganic sulfur 含或不含无机硫的铁硫配合物的MCD光谱

Bioinorganic chemistry Pub Date : 1978-01-01 DOI: 10.1016/S0006-3061(00)80004-6

Tsugufumi Muraoka, Tsunenori Nozawa, Masahiro Hatano

{"title":"MCD spectra of iron-sulfur complexes with or without inorganic sulfur","authors":"Tsugufumi Muraoka, Tsunenori Nozawa, Masahiro Hatano","doi":"10.1016/S0006-3061(00)80004-6","DOIUrl":"10.1016/S0006-3061(00)80004-6","url":null,"abstract":"<div>The magnetic circular dichroism spectra were observed for various iron-sulfur complexes with and without inorganic sulfur as models for rubredoxin and 2-Fe ferredoxin. The MCD band shapes ascribed the bands around 390 and 490 nm to Faraday A terms for mononuclear iron sulfur complexes. These bands are probably assigned to the charge-transfer transitions from the thiol sulfur orbital to the iron t2 and e 3d-orbitals, respectively. The MCD magnitudes decreased by more than one-half for binuclear iron-sulfur complexes with inorganic sulfur in comparison with those for the mononuclear complexes. The low MCD magnitude as well as the possible core symmetry as low as D2d attributed the MCD bands to Faraday B terms. Incorporation of inorganic sulfur produced new MCD bands, some of which can be assigned to the charge-transfer transitions from the inorganic sulfur orbital to the iron t2 and e 3d-orbitals. Among complexes studied here, the bis(o-xylyldithiolato) ferrate(III) monoanion gave the MCD spectrum which resembles that of a rubredoxin. This implies that the MCD spectroscopy also assessed the complex as a good rubredoxin model. However, the binuclear complex bis[o-xylyldithiolato-μ2-sulfidoferrate(III)] dianion failed to offer the MCD spectrum similar to that of the spinach ferredoxin.</div>","PeriodicalId":9177,"journal":{"name":"Bioinorganic chemistry","volume":"8 1","pages":"Pages 45-59"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0006-3061(00)80004-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11826392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6