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Magnetic interactions between metal sites in complex enzymes 复合酶中金属位之间的磁相互作用。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-07-24 DOI: 10.1007/s00775-025-02120-1
Biplab K. Maiti, Isabel Moura, José J. G. Moura

Magnetic interactions between iron–sulfur (Fe/S) clusters and transition metal centers such as nickel, molybdenum, and copper play a central role in the function of key metalloenzymes. These interactions, which arise from electronic coupling, spin exchange, and spatial arrangement, directly influence redox behavior and catalytic efficiency. This review highlights three distinct complex enzymes—[NiFe] hydrogenases, mononuclear molybdenum-containing xanthine oxidase (XO) family, and [NiFe] and [MoCu] carbon monoxide dehydrogenases (CODHs)—as paradigms for understanding (Fe/S)-metal center interactions. In [NiFe] hydrogenases, (Fe/S) clusters serve as electron relays that magnetically interact with the catalytic [NiFe] active site. In XO-type enzymes, a mononuclear Mo center is functionally and magnetically coupled to nearby Fe/S clusters, modulating substrate reduction and electron transfer. Similarly, in CODHs, both [NiFe]—and [MoCu]-dependent variants exhibit strong magnetic communication between metal active sites and surrounding Fe/S clusters, crucial for CO2/CO interconversion. Advanced spectroscopic approaches, particularly electron paramagnetic resonance (EPR) and related techniques, combined with theoretical modelling, have provided deep insights into the electronic structures and dynamic interactions within these metalloenzymes. Understanding these magnetic interactions not only sheds light on fundamental electron-transfer and enzymatic mechanisms but also guides the design of bioinspired catalysts and energy-conversion technologies.

Graphical abstract

铁硫(Fe/S)簇与过渡金属中心(如镍、钼和铜)之间的磁相互作用在关键金属酶的功能中起着核心作用。这些相互作用由电子耦合、自旋交换和空间排列引起,直接影响氧化还原行为和催化效率。本文综述了三种不同的复合酶-[NiFe]氢化酶,单核含钼黄嘌呤氧化酶(XO)家族,以及[NiFe]和[MoCu]一氧化碳脱氢酶(CODHs)-作为理解(Fe/S)-金属中心相互作用的范例。在[NiFe]氢化酶中,(Fe/S)簇作为电子继电器与催化[NiFe]活性位点发生磁相互作用。在xo型酶中,单核Mo中心在功能和磁性上与附近的Fe/S簇耦合,调节底物还原和电子转移。同样,在CODHs中,[NiFe]和[MoCu]依赖变体在金属活性位点和周围的Fe/S簇之间表现出强磁通信,这对CO2/CO相互转化至关重要。先进的光谱方法,特别是电子顺磁共振(EPR)和相关技术,结合理论建模,为这些金属酶的电子结构和动态相互作用提供了深入的见解。了解这些磁相互作用不仅能揭示基本的电子转移和酶的机制,而且还能指导生物催化剂和能量转换技术的设计。
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引用次数: 0
Disulfide-based 2-pyridyl-hydrazone prochelators induce iron deprivation and oxidative stress in ovarian cancer cells 二硫化物基2-吡啶腙促螯合剂诱导卵巢癌细胞铁剥夺和氧化应激。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-07-01 DOI: 10.1007/s00775-025-02119-8
Jacob B. Fussell, Jake P. Shaw, Madison A. Grams, Yu-Shien Sung, Ren-Hua Jheng, Andrei V. Astashkin, Elisa Tomat

Alterations of iron homeostasis are characteristic of malignant behavior and have been associated with poor prognosis in ovarian cancer patients. Iron-binding chelators are currently under investigation as potential cancer therapeutics because they allow manipulation of iron availability and redox chemistry. In addition, the design of prochelator systems enables the release of iron-binding chelators upon cell entry and therefore the sequestration of intracellular (rather than systemic) iron. We report the synthesis and biological evaluation of disulfide-based prochelators featuring a 2-pyridyl-hydrazone motif and resulting in a tridentate (S,N,N) donor set as found in several antiproliferative chelators (e.g., Triapine, Dp44mT, DpC, COTI-2). Upon disulfide reduction and iron(II) coordination, the chelators stabilize ferric complexes that are redox-active in neutral aqueous conditions. Symmetric prochelator (PH3-S)2 and glucose conjugate G6PH3 have antiproliferative, pro-apoptotic effects in A2780 ovarian carcinoma cells. Both compounds sequester intracellular iron and impact the expression of the transferrin receptor TfR1 and the iron storage protein ferritin. Oxidative stress is found to be a component of the mechanism of action of these prochelators. Accordingly, the preformed iron complex FePH3 also leads to apoptosis and iron dysregulation, and its toxicity is enhanced when the antioxidant capacity of the cells is impaired. The incorporation of the 2-pyridyl-hydrazone motif in disulfide-based prochelators therefore combines iron sequestration with pro-oxidant effects that could enhance the pharmacological profile of this chelation approach for cancer applications.

Graphical Abstract

铁稳态的改变是恶性行为的特征,并与卵巢癌患者的不良预后有关。铁结合螯合剂目前正在作为潜在的癌症治疗药物进行研究,因为它们允许操纵铁的可用性和氧化还原化学。此外,前螯合剂系统的设计使铁结合螯合剂在细胞进入时释放,从而隔离细胞内(而不是全身)铁。我们报道了具有2-吡啶腙基序的二硫基促螯合剂的合成和生物学评价,并在几种抗增殖螯合剂(如Triapine, Dp44mT, DpC, COTI-2)中发现了三齿(S,N,N)供体集。通过二硫还原和铁(II)配位,螯合剂稳定了在中性水条件下具有氧化还原活性的铁配合物。对称前螯合剂(PH3-S)2和葡萄糖偶联物G6PH3对A2780卵巢癌细胞具有抗增殖、促凋亡作用。这两种化合物都能隔离细胞内的铁,并影响转铁蛋白受体TfR1和铁蛋白的表达。氧化应激被发现是这些促剂作用机制的一个组成部分。因此,预形成的铁络合物FePH3也会导致细胞凋亡和铁的失调,当细胞的抗氧化能力受损时,其毒性增强。因此,将2-吡啶腙基序结合到基于二硫化物的螯合剂中,将铁螯合与促氧化作用结合起来,可以增强这种螯合方法在癌症应用中的药理学特征。
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引用次数: 0
Au(I)-based compounds inhibit nsp14/nsp10 and nsp13 (helicase) to exert anti-SARS-CoV-2 properties 金(I)基化合物抑制nsp14/nsp10和nsp13(解旋酶)发挥抗sars - cov -2的特性。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-18 DOI: 10.1007/s00775-025-02118-9
Jingxin Chen, Xueying Wei, Chun-Lung Chan, Kaiming Tang, Shuofeng Yuan, Hongyan Li, Hongzhe Sun

Au(I) compounds have long been associated with medicine for the treatment of various diseases, especially auranofin has been used for the treatment of rheumatoid arthritis. In addition, Au(I) based compounds also exhibit anti-cancer, anti-bacteria properties. The recent prevalence of the COVID-19 pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has aroused attention to investigate the antiviral potential of Au(I) compounds. Herein we demonstrate the pan-anti-SARS-CoV-2 activity of Au(I) metallodrugs in mammalian cells. We synthesized a panel of Au(I)-based compounds and found that these compounds could effectively inhibit the exoribonuclease and methyltransferase activities of SARS-CoV-2 nsp14/nsp10 complex, and the ATPase and DNA unwinding activities of SARS-CoV-2 nsp13 (helicase). Mechanistic studies reveal that Au(I) can not only displace the critical Zn(II) ions from nsp14/nsp10 complex and nsp13 but also changes the secondary and quaternary structure of nsp14 and perturbate the DNA unwinding of nsp13 by disrupting the ATP binding. This study illustrates a multi-target feature Au(I) compounds/drug agents for the viruses, highlighting their potential as pan-anti-SARS-CoV-2 (or relevant viruses) agents.

Graphical Abstract

金(I)化合物长期以来一直与治疗各种疾病的药物有关,特别是金糠蛋白已被用于治疗类风湿性关节炎。此外,金(I)基化合物还具有抗癌、抗菌的特性。最近由严重急性呼吸综合征冠状病毒2 (SARS-CoV-2)引起的COVID-19大流行引起了人们对Au(I)化合物抗病毒潜力的关注。本研究证明了金(I)金属药物在哺乳动物细胞中的泛抗sars - cov -2活性。我们合成了一组Au(I)基化合物,发现这些化合物可以有效抑制SARS-CoV-2 nsp14/nsp10复合物的外核糖核酸酶和甲基转移酶活性,以及SARS-CoV-2 nsp13(解旋酶)的atp酶和DNA解绕活性。机制研究表明,Au(I)不仅可以取代nsp14/nsp10复合物和nsp13中的关键Zn(II)离子,还可以改变nsp14的二级和四级结构,并通过破坏ATP结合扰乱nsp13的DNA解绕。该研究阐明了病毒的Au(I)化合物/药物制剂的多靶点特征,突出了它们作为泛抗sars - cov -2(或相关病毒)制剂的潜力。
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引用次数: 0
Bioinorganic chemistry: where from and where to? 生物无机化学:从何而来,向何而去?
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-08 DOI: 10.1007/s00775-025-02112-1
Clotilde Policar

Bioinorganic chemistry is a multidisciplinary field that bridges the apparent divide between inorganic chemistry and biology. The very name “bioinorganic” is an intriguing oxymoron, as “inorganic” chemistry traditionally refers to the study of the inanimate world, while the “bio” prefix refers to living systems. Bioinorganic chemistry focuses on metallic systems within biological environments, with the dual aims of better understanding these natural systems and leveraging the solutions developed through evolution to design new industrial or therapeutic applications. As a close cousin of the field of metallomics, bioinorganic chemistry shares the fundamental principles that underpin metallomics’ systemic analyses of metal-containing biomolecules. In this article, we trace the historical development of bioinorganic chemistry, highlighting its recent advancements and outlining future research challenges in this dynamic interdisciplinary area.

Graphical abstract

生物无机化学是一个多学科领域,它弥合了无机化学和生物学之间明显的鸿沟。“生物无机”这个名字本身就是一个有趣的矛盾修饰法,因为“无机”化学传统上指的是对无生命世界的研究,而“生物”前缀指的是生命系统。生物无机化学专注于生物环境中的金属系统,具有更好地理解这些自然系统和利用通过进化开发的解决方案来设计新的工业或治疗应用的双重目标。作为金属学领域的近亲,生物无机化学分享了支撑金属学对含金属生物分子的系统分析的基本原理。在这篇文章中,我们追溯了生物无机化学的历史发展,重点介绍了它的最新进展,并概述了未来在这个充满活力的跨学科领域的研究挑战。
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引用次数: 0
Organotin(IV) carboxylates—derivatives of bexarotene: synthesis, characterization, anti/prooxidant activity, and high cytotoxicity 有机锡(IV)羧酸酯-贝沙罗汀衍生物:合成、表征、抗/促氧化活性和高细胞毒性。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-04 DOI: 10.1007/s00775-025-02117-w
D. A. Burmistrova, N. P. Pomortseva, N. T. Berberova, N. R. Almyasheva, M. A. Kiskin, A. I. Poddel’sky, A. S. Vashurin, I. V. Smolyaninov

New organotin(IV) mono- and bis-carboxylate complexes derivatives of Bexarotene (bex), viz. R3Sn(bex) (where R = Ph (1); Cy (2); nBu (3)), and R2Sn(bex)2 (where R = Et (4), tBu (5), Ph (6)) were synthesized. Compounds were fully characterized using spectroscopic techniques. The molecular structure for the Ph3Sn(bex) (1) in crystalline form was established by single-crystal X-ray diffraction. Electrochemical properties of tin complexes and bexarotene were investigated by cyclic voltammetry. The target compounds are characterized by the high oxidation potentials in the mixture of aprotic solvents. The anti/prooxidant activity of the complexes and bexarotene in the lipid peroxidation process and in the reaction of the DNA oxidative damage was studied in vitro. Excellent cell growth inhibition against A549, HCT 116 and MCF-7 cancer cells was observed for triorganotin (IV) carboxylates with IC50 values mostly under the submicromolar concentration range and there are more effective than bexarotene or cisplatin.

Graphical abstract

新型有机锡(IV)贝沙罗汀(bex)的单羧酸和双羧酸配合物衍生物,即R3Sn(bex)(其中R = Ph (1);Cy (2);合成了nBu(3)和R2Sn(bex)2(其中R = Et (4), tBu (5), Ph(6))。利用光谱技术对化合物进行了全面表征。用单晶x射线衍射法确定了Ph3Sn(bex)(1)晶体的分子结构。用循环伏安法研究了锡配合物和贝沙罗汀的电化学性质。目标化合物在非质子溶剂混合物中具有高氧化电位的特点。体外实验研究了该复合物和贝沙罗汀在脂质过氧化过程和DNA氧化损伤反应中的抗/促氧化活性。三有机锡(IV)羧酸酯对A549、HCT 116和MCF-7癌细胞有良好的抑制作用,IC50值大多在亚微摩尔浓度范围内,比贝沙罗汀或顺铂更有效。
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引用次数: 0
Contrasting secondary coordination sphere effects on spin density distribution in Red vs. Blue Cu azurin 对比次级配位球效应对红、蓝铜自旋密度分布的影响。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-05-24 DOI: 10.1007/s00775-025-02116-x
Casey Van Stappen, Edward Reijerse, Sonia Chabbra, Alexander Schnegg, Yi Lu

Metalloproteins tune the electronic properties of metal active sites through a combination of primary and secondary coordination sphere effects (PCS and SCS) to efficiently perform an array of redox chemistry, including electron transfer (ET) and catalysis. A major influence of these effects is the anisotropic spatial distribution of redox-active molecular orbitals (RAMOs), which in turn dictates redox chemistry of the metalloproteins. While much progress has been made in understanding the SCS effects on RAMOs in individual native metalloproteins, it has been difficult to experimentally examine the influence of the same SCS effects on RAMOs with different spatial distributions. Taking advantage of our recent studies of SCS effect on blue copper azurin from Pseudomonas aeruginosa (Blue CuAz) and its M121H/H46E variant that closely mimic the red copper protein (Red CuAz), in which their RAMOs are dominated by either Cu–Sπ or Cu–Sσ interactions, respectively, we herein compare and contrast how the same SCS modifications impact the electronic and geometric structures of blue and red Cu center in the same protein scaffold. Specifically, we expand our understanding of unpaired electron distribution at the Cu-binding site of Red CuAz and its SCS N47S, F114P, and F114N mutations using 1H and 14N electron–nuclear double resonance (ENDOR) spectroscopy, and then further combine these data sets with recent studies and DFT calculations to provide insight into how these mutations differentially (or similarly) impact electronic structure in Red vs. Blue CuAz. We find that electrostatics produce similar effects in both Red and Blue CuAz, where the introduction of dipole moments in the vicinity of Cu and S produces changes in spin density distribution and of the same sign and comparable magnitude. However, disruption of H-bonding with S through the F114P mutation leads to opposing effects in Red vs. Blue CuAz, which we propose arise from differences in the conformation of Cys112 sidechain adapted in the absence the stabilizing SC112⋯H–N backbone interaction.

Graphical abstract

金属蛋白通过一级和二级配位球效应(PCS和SCS)调节金属活性位点的电子性质,从而有效地进行一系列氧化还原化学,包括电子转移(ET)和催化。这些效应的主要影响是氧化还原活性分子轨道(RAMOs)的各向异性空间分布,这反过来又决定了金属蛋白的氧化还原化学。虽然在了解单个天然金属蛋白中SCS对RAMOs的影响方面已经取得了很大进展,但实验研究相同的SCS对不同空间分布的RAMOs的影响一直很困难。利用我们最近对铜绿假单胞菌(Pseudomonas aeruginosa, blue CuAz)及其M121H/H46E突变体的影响研究,我们比较和对比了相同的SCS修饰如何影响相同蛋白质支架中蓝色和红色Cu中心的电子和几何结构,它们的RAMOs分别由Cu- s - π或Cu- s - σ相互作用主导。具体来说,我们使用1H和14N电子核双共振(ENDOR)光谱扩展了我们对红色CuAz及其SCS N47S, F114P和F114N突变的cu结合位点的未配对电子分布的理解,然后进一步将这些数据集与最近的研究和DFT计算相结合,以深入了解这些突变如何差异(或相似)影响红色和蓝色CuAz的电子结构。我们发现静电在红色和蓝色CuAz中产生类似的效应,其中在Cu和S附近引入偶极矩会产生自旋密度分布的变化,并且具有相同的符号和相当的幅度。然而,通过F114P突变破坏与S的氢键会导致红色与蓝色CuAz中的相反效应,我们认为这是由于在缺乏稳定的SC112⋯H-N骨干相互作用的情况下适应的Cys112侧链构象的差异。
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引用次数: 0
Determination of silver(I)-binding sites in canonical B-DNA by NMR spectroscopy 核磁共振光谱法测定典型B-DNA中银(I)结合位点。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-05-02 DOI: 10.1007/s00775-025-02115-y
Tabea Lenz, Uroš Javornik, Marian Hebenbrock, Janez Plavec, Jens Müller

The interaction of metal ions with nucleic acids was studied by determining the initial binding sites of Ag+ ions at unmodified B-DNA by NMR spectroscopy. In particular, NMR spectra were recorded of the Dickerson-Drew dodecamer sequence in the presence of different ratios of Ag+ ions to DNA. The data indicate that the coordination of the first three Ag+ ions per duplex preferentially takes place inside the B-DNA helix rather than at other possible binding sites such as the negatively charged phosphate backbone and/or the endocyclic N7 position of purine residues. Larger DNA aggregates are formed in the presence of excess Ag+ ions, as indicated by the formation of a precipitate and by significant changes in the circular dichroism spectra. As shown by a titration with chloride ions, the Ag+ ions are only loosely bound to the nucleic acids and can be released by precipitation of AgCl.

Graphical Abstract

通过核磁共振光谱测定未修饰B-DNA上Ag+离子的初始结合位点,研究了金属离子与核酸的相互作用。特别是,在不同Ag+离子与DNA的比例下,记录了Dickerson-Drew十二聚体序列的核磁共振谱。数据表明,每个双链的前三个Ag+离子的配位优先发生在B-DNA螺旋内,而不是在其他可能的结合位点,如带负电荷的磷酸主链和/或嘌呤残基的内环N7位置。在过量银离子存在的情况下,较大的DNA聚集体形成,如沉淀物的形成和圆二色光谱的显著变化所表明的那样。如氯离子滴定所示,Ag+离子仅松散地与核酸结合,可通过沉淀AgCl释放。
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引用次数: 0
In vitro cellular and molecular plus in silico studies of a substituted bipyridine-coordinated Zn(II) ion: cytotoxicity, ROS-induced apoptosis, anti-metastasis, and BAX/BCL2 genes expression 取代联吡啶配位Zn(II)离子的体外细胞和分子研究:细胞毒性、ros诱导的细胞凋亡、抗转移和BAX/BCL2基因表达。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-04-20 DOI: 10.1007/s00775-025-02114-z
Marzieh Anjomshoa, Bagher Amirheidari, Mehdi Sahihi, Jan Janczak, Hamid Forootanfar, Alireza Farsinejad, Yasaman Abolhassani, Somayyeh Karami-Mohajeri

A new dimethyl-substituted bipyridine–Zn(II) complex (2Mebpy–Zn) was synthesized and structurally characterized. Single-crystalline structure of the complex was elucidated as [Zn(2Mebpy)3](ClO4)2∙1.5(dioxane) by X-ray diffraction, where 2Mebpy is 4,4′-dimethyl-2,2′-bipyridine. The three-dimensional electrostatic potential maps (3D ESP) were plotted for [Zn(2Mebpy)3]2+ cation and [Zn(2Mebpy)3](ClO4)2 molecule. In vitro cytotoxicity studies indicated significant cytotoxicity of 2Mebpy–Zn against both breast (MCF-7) and glioblastoma (U-87) cancer cells relative to normal murine embryo cells (NIH/3T3). The results are indicative of a superior selectivity toward MCF-7 over the other cell lines as confirmed by IC50 value of 5.1 ± 0.5 µM after 48 h. Interestingly, MCF-7 and U-87 cells death induced by 2Mebpy–Zn mostly proceed through an apoptotic pathway which probably associates with the overproduction of reactive oxygen species (ROS). The Zn(II) complex suppressed the metastatic affinity of MCF-7 cells by blocking migration as well as formation of colonies. Also, the expression of two opponent apoptosis-relevant genes (BAX and BCL2) measured by real-time polymerase chain reaction (qPCR) experiments indicated that 2Mebpy–Zn could potentially trigger apoptotic cell death. Moreover, 2Mebpy–Zn could cleave hydrolytically the pUC19 DNA without the need to add any external agent. Finally, the binding affinity of two enantiomers of 2Mebpy–Zn toward cancer therapeutic targets, such as anti-apoptotic proteins, estrogen receptor α, tubulin, and topoisomerase II, was studied by in silico molecular docking. In conclusion, 2Mebpy–Zn can be introduced as a potential therapeutic agent in breast cancer and indicates that other metal complexes with bipyridine derivatives can also exhibit promising anticancer effects.

Graphical Abstract

合成了一种新的二甲基取代联吡啶-锌(II)配合物(2Mebpy-Zn)并对其结构进行了表征。x射线衍射证实该配合物的单晶结构为[Zn(2Mebpy)3](ClO4)2∙1.5(二恶烷),其中2Mebpy为4,4′-二甲基-2,2′-联吡啶。绘制了[Zn(2Mebpy)3]2+阳离子和[Zn(2Mebpy)3](ClO4)2分子的三维静电电位图(3D ESP)。体外细胞毒性研究表明,相对于正常小鼠胚胎细胞,2Mebpy-Zn对乳腺癌(MCF-7)和胶质母细胞瘤(U-87)癌细胞具有显著的细胞毒性(NIH/3T3)。48 h后IC50值为5.1±0.5µM,结果表明MCF-7比其他细胞系具有更好的选择性。有趣的是,2Mebpy-Zn诱导的MCF-7和U-87细胞死亡主要通过凋亡途径进行,这可能与活性氧(ROS)的过量产生有关。Zn(II)复合物通过阻断MCF-7细胞的迁移和集落的形成,抑制了MCF-7细胞的转移亲和力。同时,实时聚合酶链反应(qPCR)实验检测了两种凋亡相关基因(BAX和BCL2)的表达,表明2Mebpy-Zn可能潜在地引发凋亡细胞死亡。此外,2Mebpy-Zn可以水解裂解pUC19 DNA,而无需添加任何外部介质。最后,通过硅分子对接研究了2Mebpy-Zn的两个对映体对肿瘤治疗靶点(如抗凋亡蛋白、雌激素受体α、微管蛋白和拓扑异构酶II)的结合亲和力。综上所述,2Mebpy-Zn可以作为一种潜在的乳腺癌治疗剂引入,并表明其他金属配合物与联吡啶衍生物也可以表现出很好的抗癌作用。
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引用次数: 0
Electron spin resonance in microalgae whole-cells to monitor hydrogen production 微藻全细胞电子自旋共振监测产氢。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-03-24 DOI: 10.1007/s00775-025-02113-0
Silvia Pizzanelli, Emanuela Pitzalis, Simone Botticelli, Fabrizio Machetti, Cecilia Faraloni, Giovanni La Penna

Unicellular algae can produce pure hydrogen gas from water and sun-light. We observed Chlorella vulgaris whole cells when they produce hydrogen using X-band continuous-wave electron spin resonance (ESR). Whole-cell spectroscopy is particularly useful in those cases where purified enzymes are sensitive to oxidant air conditions. By tuning cell preparation, the microwave power, the temperature, the time of air exposure, we could isolate from the background signal candidate markers of hydrogen production. Our observations indicate the presence of a species consistent mainly with an intermediate ({hbox {Fe}_{3}hbox {S}_{4}{^{+}}}) cluster when hydrogen production is high, but not maximal, and when FeS cluster oxidation has just begun. The optimal conditions to detect the above marker by ESR have been identified. Our investigation paves the way to extensive statistical analysis of cellular conditions in future studies using whole-cell ESR.

单细胞藻类可以从水和阳光中产生纯氢气。利用x波段连续波电子自旋共振(ESR)对小球藻整个细胞产氢过程进行了观察。全细胞光谱学在纯化酶对氧化性空气条件敏感的情况下特别有用。通过调整细胞的制备、微波功率、温度、暴露时间,我们可以从背景信号中分离出候选的产氢标记物。我们的观察表明,当氢产量高但不是最大时,以及当FeS团簇氧化刚刚开始时,存在一个主要与中间fe3s4 +团簇一致的物种。确定了ESR法检测上述标记物的最佳条件。我们的研究为将来使用全细胞ESR对细胞状况进行广泛的统计分析铺平了道路。
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引用次数: 0
Polyoxometalates bind multiple targets involved in Alzheimer’s disease 多金属氧酸盐与阿尔茨海默病相关的多个靶点结合。
IF 2.7 3区 化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-03-22 DOI: 10.1007/s00775-025-02111-2
Karin Ben Zaken, Rivka Bouhnik, Naama Omer, Naamah Bloch, Abraham O. Samson

Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by brain aggregates of amyloid-β (Aβ) plaques and Tau tangles. Despite extensive research, effective therapy for AD remains elusive. Polyoxometalates (POMs), a class of inorganic compounds with diverse chemical structures and properties, are emerging as potential candidates for AD treatment due to their ability to target key molecular players implicated in disease pathogenesis, such as Aβ, acetylcholinesterase (AChE) and butyryl acetylcholinesterase (BChE). Here, we use molecular docking to predict the binding pose and affinities of POMs to 10 top targets associated with AD. First, we validate our method by replicating experimentally known binding of POMs to Aβ (ΔG = – 9.67 kcal/mol), AChE (ΔG = – 9.39 kcal/mol) and BChE (ΔG = – 10.86 kcal/mol). Then, using this method, we show that POM can also bind β-secretase 1 (BACE1, ΔG = – 10.14 kcal/mol), presenilin 1 (PSEN1, ΔG = – 10.65 kcal/mol), presenilin 2 (PSEN2, ΔG = – 7.94 kcal/mol), Amyloid Precursor Protein (APP, ΔG = – 7.26 kcal/mol), Apolipoprotein E (APOE4, ΔG = – 10.05 kcal/mol), Microtubule-Associated Protein Tau (MAPT, ΔG = – 5.28 kcal/mol) depending on phosphorylation, and α-synuclein (SNCA, ΔG = – 7.64 kcal/mol). Through such binding, POMs offer the potential to mitigate APP cleavage, Aβ oligomer neurotoxicity, Aβ aggregation, thereby attenuating disease progression. Overall, our molecular docking study represents a powerful tool in the discovery of POM-based therapeutics for AD, facilitating the development of novel treatments for AD.

Graphical abstract

阿尔茨海默病(AD)是一种进行性神经退行性疾病,其特征是淀粉样蛋白-β (a β)斑块和Tau缠结的大脑聚集。尽管进行了广泛的研究,但阿尔茨海默病的有效治疗方法仍然难以捉摸。多金属氧酸盐(pom)是一类具有多种化学结构和性质的无机化合物,由于其能够靶向与疾病发病机制相关的关键分子,如a β、乙酰胆碱酯酶(AChE)和丁基乙酰胆碱酯酶(BChE),正成为治疗AD的潜在候选者。在这里,我们使用分子对接来预测POMs与AD相关的10个顶级靶点的结合姿态和亲和力。首先,我们通过复制实验已知的POMs与Aβ (ΔG = - 9.67 kcal/mol)、AChE (ΔG = - 9.39 kcal/mol)和BChE (ΔG = - 10.86 kcal/mol)的结合来验证我们的方法。然后,利用这种方法,我们发现POM还可以结合β-分泌酶1 (BACE1, ΔG = - 10.14 kcal/mol)、早老素1 (PSEN1, ΔG = - 10.65 kcal/mol)、早老素2 (PSEN2, ΔG = - 7.94 kcal/mol)、淀粉样蛋白前体蛋白(APP, ΔG = - 7.26 kcal/mol)、载脂蛋白E (APOE4, ΔG = - 10.05 kcal/mol)、微管相关蛋白Tau (MAPT, ΔG = - 5.28 kcal/mol)和α-突触核蛋白(SNCA, ΔG = - 7.64 kcal/mol)。通过这种结合,POMs提供了减缓APP切割、Aβ寡聚物神经毒性、Aβ聚集的潜力,从而减缓疾病进展。总之,我们的分子对接研究是发现基于pom的阿尔茨海默病治疗方法的有力工具,促进了阿尔茨海默病新疗法的开发。
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Journal of Biological Inorganic Chemistry
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