Metallomics最新文献_第2页

Correlative imaging reveals metal dyshomeostasis and altered zinc coordination environments in a pre-clinical Type 2 diabetes model. 相关影像学显示临床前2型糖尿病模型中金属平衡失调和锌配位环境改变。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfaf043

Gaewyn Ellison, Arazu Sharif, Meg Willans, Ashley Hollings, Ryu Takechi, Keith Bambery, Valerie Mitchell, Daryl L Howard, Mark J Hackett

{"title":"Correlative imaging reveals metal dyshomeostasis and altered zinc coordination environments in a pre-clinical Type 2 diabetes model.","authors":"Gaewyn Ellison, Arazu Sharif, Meg Willans, Ashley Hollings, Ryu Takechi, Keith Bambery, Valerie Mitchell, Daryl L Howard, Mark J Hackett","doi":"10.1093/mtomcs/mfaf043","DOIUrl":"10.1093/mtomcs/mfaf043","url":null,"abstract":"Zinc ions are highly abundant in pancreatic islet tissue, and multiple lines of evidence link loss of zinc homeostasis to poor glucose regulation in both type 1 and type 2 diabetes. Two major islet zinc-binding proteins, insulin and metallothionein, play crucial roles in beta cell function and glucose regulation. Here we used X-ray fluorescence microscopy (XFM) to map zinc and five additional elements (Cl, K, Ca, Fe, and Cu) to compare the metallome of exocrine, peri-islet and islet regions in young and old, non-diabetic control and diabetic (db/db) mice. We also determined the main forms of zinc found in pancreatic tissue using X-ray absorption near-edge structure (XANES) spectroscopic imaging. This allowed investigation of the relationship between zinc speciation and its protein ligands using correlative immunofluorescent imaging to assess whether zinc coordination may play a role in diabetes pathology. The anticipated depletion of zinc in young diabetic islets was accompanied by a significant decrease in insulin expression and increase in metallothionein expression. A parallel change in the contribution of cysteine vs histidine zinc speciation was also observed. Counter-intuitively, zinc abundance and speciation appeared to normalise in old diabetic animals with more advanced disease, despite large differences in labile zinc-binding protein content. These results are consistent with disrupted zinc coordination, where metallothionein-regulated muffling to minimise ionic activity is overwhelmed and zinc binds to unidentified ligands in histidine-like conformations. This opens future study questions focussed on the complex interplay between labile zinc, metallothionein, and oxidative mechanisms that may interfere with normal zinc homeostasis.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12859259/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145888375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The nature of thallium crystals in Brassica oleracea (kale): a synchrotron multi-technique investigation. 甘蓝中铊晶体的性质：同步多技术研究。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag010

Amelia Corzo-Remigio, Hugh H Harris, Michael W M Jones, Tony Wang, Dennis Brueckner, Kathryn M Spiers, Jan Garrevoet, Antony van der Ent

{"title":"The nature of thallium crystals in Brassica oleracea (kale): a synchrotron multi-technique investigation.","authors":"Amelia Corzo-Remigio, Hugh H Harris, Michael W M Jones, Tony Wang, Dennis Brueckner, Kathryn M Spiers, Jan Garrevoet, Antony van der Ent","doi":"10.1093/mtomcs/mfag010","DOIUrl":"10.1093/mtomcs/mfag010","url":null,"abstract":"Brassica cultivars have the ability to hyperaccumulate thallium when growing on soils contaminated with this element. Earlier research identified the presence of crystalline thallium deposits in the leaves of Brassica oleracea var. acephala. The aim of this study was to investigate the nature of these thallium crystals. A combination of synchrotron-based methods was used involving micro-X-ray fluorescence (µXRF) for the elemental distribution in the leaves and micro-X-ray diffraction mapping (µXDM) for the identification of the crystals. Thallium concentrates along the foliar margins, especially near vascular bundles, and dense congregations of minute thallium-rich crystals are observed in these areas. The thallium speciation is revealed to be nearly exclusively monovalent thallium, whilst the crystals are largely cubic thallium chloride, TlCl(s). The formation of thallium-rich crystals in the form of thallium chloride appears to be a tolerance mechanism similar to that of halophytes, and possibly a way in which excess thallium is expelled from leaves.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13017095/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147269191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Specificity and regulatory mechanism of metal ions in Cas12a enzymatic cleavage activity. 金属离子对Cas12a酶裂解活性的特异性及调控机制

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag027

Yizhen Guo, Xiangshi Tan

{"title":"Specificity and regulatory mechanism of metal ions in Cas12a enzymatic cleavage activity.","authors":"Yizhen Guo, Xiangshi Tan","doi":"10.1093/mtomcs/mfag027","DOIUrl":"10.1093/mtomcs/mfag027","url":null,"abstract":"Metal ions play key roles in both physiological and pathological processes. The activity of nearly all nucleases depends on metal ions as cofactors. CRISPR-Cas system is widely used in gene editing and nucleic acid detection, and its ongoing development and frontier research have attracted significant attention. This study aims to explore and elucidate the effects of various metal ions on Cas12a-catalysed cleavage reactions including their specificity and regulatory mechanisms. Here, we found that certain metal ions significantly affected both the cleavage activity and the reaction specificity of Cas12a. Metal ions mediate enzyme-substrate binding by increasing the affinity between Cas12a and single-stranded DNA (ssDNA). In particular, unlike other metal ions, Mn2+ can achieve cleavage of ssDNA by only activating the catalytic domain without requiring the entire Cas12a. Structural alignment and site-directed mutagenesis of the active site revealed the structural basis of Cas12a catalysis and elucidated how metal ions influence its catalytic reaction in terms of specificity and regulatory mechanism. These results provide a theoretical foundation and offer innovative perspectives for the application of Cas12a-based enzyme technology.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148904605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functional trihydroxyl germanium moiety in THGP confers novel enzyme activity inhibition abilities while also attenuating intracellular effects against multidrug-resistant Acinetobacter baumannii. THGP中的功能性三羟基锗片段赋予了新的酶活性抑制能力，同时也减弱了对多药耐药鲍曼不动杆菌的细胞内效应。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag008

Kaoru Yamabe, Yukio Arakawa, Masaki Shoji, Katsushiro Miyamoto, Takahiro Tsuchiya, Shinobu Fujii, Katsuhiko Minoura, Yukihiro Akeda, Kazunori Tomono, Rikiro Fukunaga, Mitsuko Onda

{"title":"Functional trihydroxyl germanium moiety in THGP confers novel enzyme activity inhibition abilities while also attenuating intracellular effects against multidrug-resistant Acinetobacter baumannii.","authors":"Kaoru Yamabe, Yukio Arakawa, Masaki Shoji, Katsushiro Miyamoto, Takahiro Tsuchiya, Shinobu Fujii, Katsuhiko Minoura, Yukihiro Akeda, Kazunori Tomono, Rikiro Fukunaga, Mitsuko Onda","doi":"10.1093/mtomcs/mfag008","DOIUrl":"10.1093/mtomcs/mfag008","url":null,"abstract":"THGP [3-(trihydroxygermyl) propanoic acid], an organogermanium compound, has been confirmed to exert multifaceted effects in mammalian and eukaryotic cells. Focusing on the characteristic trihydroxyl germanium moiety of THGP, we aimed to discover its novel pharmacological abilities and effects against multidrug-resistant Acinetobacter baumannii, a prokaryote with critical implications on global public health. In all assays, spectrometric determinations (OD) were conducted using a 96-well microtiter plate: OD489 for β-lactamase activity, OD600 for bacterial mass, OD570 for biofilm mass, OD340 for alcohol dehydrogenase (ADH) activity, and OD460 for dehydrogenases-NAD(P)-NAD(P)H system activity. THGP was observed to exhibit β-lactamase activity inhibition ability, which actually presents synergistic effects with cephem antibiotics against A. baumannii. We also revealed ADH activity inhibition ability, which contributes to the antiproliferative effect of THGP, a weak organic acid, against A. baumannii. However, low permeability of THGP through the bacterial cell because of its high hydrophilicity seemed to attenuate this intracellular effect. Furthermore, THGP was postulated to possess preventive effects on biofilm formation at sub-MIC (below the minimum inhibitory concentration) via an unknown mechanism. To our knowledge, this study is the first to report the antimicrobial effects of an organogermanium compound and demonstrates the inhibition abilities of THGP against two ubiquitous enzymes in pathogenic bacteria. However, the findings of this study are insufficient for clinical applications. Further studies are warranted to promote the development of clinically useful organogermanium compounds. Nevertheless, our findings provide important baseline information for future exploratory studies.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146256746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phosphate availability modulates elemental homeostasis in rainbow trout hepatocytes: compositional ionomics illuminates system-wide adjustments. 磷酸盐可用性调节虹鳟鱼肝细胞的元素稳态：组成离子学阐明了系统范围的调节。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag022

Punidan D Jeyasingh, Nicholas Hrdlicka, Kristina D Baker, Ryan E Sherman, Matteo Minghetti

{"title":"Phosphate availability modulates elemental homeostasis in rainbow trout hepatocytes: compositional ionomics illuminates system-wide adjustments.","authors":"Punidan D Jeyasingh, Nicholas Hrdlicka, Kristina D Baker, Ryan E Sherman, Matteo Minghetti","doi":"10.1093/mtomcs/mfag022","DOIUrl":"10.1093/mtomcs/mfag022","url":null,"abstract":"Phosphorus (P) is central to biology, yet it remains unclear whether P limitation acts as an isolated nutrient constraint or as a perturbation to a dynamical elemental network. We tested this using the rainbow trout liver cell line RTL-W1 by manipulating phosphorus supply (0%, 10%, and 100% of normal supply; P0, P10, and P100) and quantifying proliferation, protein content, metabolic activity, membrane integrity, and multielement composition. Phosphorus supply significantly altered cell proliferation and protein accumulation, with higher P supporting greater growth. Metabolic activity was affected by P supply, whereas membrane integrity remained largely stable, indicating altered allocation rather than generalized cellular damage. Compositional ionomic analysis revealed that phosphorus perturbation restructured the multielement network. At Day 3, treatment effects were strongest for P, K, and S. By Day 6, additional elements, including Sr and Mn, exhibited coordinated shifts relative to the P100 reference. Compositional data analysis showed that elemental imbalances shifted through time, consistent with flux rebalancing in an open system rather than static homeostasis. If phosphorus limitation were mechanistically independent, multielement composition would remain stable aside from P itself. Instead, phosphorus perturbation induced coordinated shifts across the ionome, consistent with rebalancing in open material systems.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13321119/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148238678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

I nvestigating apparent drivers of urinary Ca isotope variability in a sample population. 调查样本人群中尿钙同位素变异的明显驱动因素。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag017

Dan P Razionale, Kate Sanderson, Carlynda Lee, Rosa Grigoryan, Michael A Kipp, Roxana T Shafiee, Emily Miaou, Hayward Melton, Théo Tacail, François L H Tissot

{"title":"I nvestigating apparent drivers of urinary Ca isotope variability in a sample population.","authors":"Dan P Razionale, Kate Sanderson, Carlynda Lee, Rosa Grigoryan, Michael A Kipp, Roxana T Shafiee, Emily Miaou, Hayward Melton, Théo Tacail, François L H Tissot","doi":"10.1093/mtomcs/mfag017","DOIUrl":"10.1093/mtomcs/mfag017","url":null,"abstract":"Isotopes of calcium (Ca) in blood and urine have been introduced as a potential clinical tool for monitoring bone mineral balance (BMB). While several works support the ability of Ca isotope composition (δ44/42Ca) to capture a shift in BMB in response to external forcings (e.g. bed rest) or disease (e.g. osteoporosis), the influence of an individual's demographic, health status, diet or lifestyle on δ44/42CaUrine/Blood remains largely unconstrained. To gauge the effects of several variables among these four broader categories, we present a population study of δ44/42CaUrine from 103 individuals (age 18-76). Age is negatively correlated with δ44/42CaUrine, and we identify three other attributes (active vitamin D deficiency, vegetarian diet, and being post-menopausal) that lead to systematic differences in an individual's δ44/42CaUrine. Fluctuations in Ca reabsorption generate significant intra-individual δ44/42CaUrine variability. Within a typical range of reabsorption rates, however, the initial isotope composition (δ44/42CaSerum) exerts the strongest control on inter-individual δ44/42CaUrine variability. Using a simple Rayleigh model to express isotopic fractionation associated with Ca reabsorption in the kidneys, we find that a fractionation factor of 0.99972 reproduces the range of isotope ratios and excretion values for several, healthy individuals across three different studies and nearly a 30-year age span. Importantly, δ44/42CaUrine variations in three post-menopausal women from three separate studies cannot be explained by the same model, pointing to a different mechanistic control of δ44/42CaUrine in these subjects.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148154592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pharmacokinetic, antimicrobial, antibiofilm, and virulence target binding propensities of a hetero-ligated thiolato-bridged dinuclear metallacyclic manganese(I)-based CO-releasing molecule. 一种杂连接巯基桥接双核金属环锰(I)共释放分子的药代动力学、抗菌、抗菌膜和毒力靶标结合倾向。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag031

Aswathy Anil, Meyappan Vadivel, Sriram Shankar, Subhashree Subhasmita Nayak, Ramadas Krishna, Udit Kumar, Bala Manimaran, Natarajan Sakthivel

{"title":"Pharmacokinetic, antimicrobial, antibiofilm, and virulence target binding propensities of a hetero-ligated thiolato-bridged dinuclear metallacyclic manganese(I)-based CO-releasing molecule.","authors":"Aswathy Anil, Meyappan Vadivel, Sriram Shankar, Subhashree Subhasmita Nayak, Ramadas Krishna, Udit Kumar, Bala Manimaran, Natarajan Sakthivel","doi":"10.1093/mtomcs/mfag031","DOIUrl":"10.1093/mtomcs/mfag031","url":null,"abstract":"Staphylococcus aureus and Escherichia coli remain major concerns in global public health, posing clinical challenges due to their adaptability, virulence, and biofilm-mediated persistence. The continued emergence of drug-resistant strains necessitates the development of new antimicrobial compounds. In this study, we evaluated the multifunctional potential of a hetero-ligated, thiolato-bridged dinuclear metallacyclic Mn(I)-based CO-releasing compound (S-MnC), analysing its antibacterial, antibiofilm, molecular, and target-binding efficacies against S. aureus and E. coli. The antibacterial potential of S-MnC was confirmed by a significant decrease in bacterial growth, biofilm biomass, matrix integrity, motility, and structural integrity. Our results further confirmed its anti-adhesive potential, demonstrating the depletion of intracellular free thiols and an increase in reactive oxygen species. Additionally, S-MnC displayed safe hemolysis levels. ADMET analysis indicated a good balance of drug-likeness properties. Molecular docking studies suggested potential binding sites of S-MnC to molecular targets such as bacterial DNA Gyrase B, SaeR, SaeS, and SarA of S. aureus, as well as DNA Gyrase B and SdiA of E. coli, suggesting the antivirulence mechanisms mediated by S-MnC. In this study, we report, for the first time, the antibacterial and antibiofilm activities of S-MnC against both Gram-negative, E. coli, and Gram-positive, S. aureus, and its binding affinity to multiple molecular and virulence targets.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149101193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metallomic profiling of mouse tissues under differential dietary zinc intake. 不同膳食锌摄入量下小鼠组织的金属学分析。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag015

Suyun Choi, Chaoyi Deng, Yi Wang, Sangyong Choi

{"title":"Metallomic profiling of mouse tissues under differential dietary zinc intake.","authors":"Suyun Choi, Chaoyi Deng, Yi Wang, Sangyong Choi","doi":"10.1093/mtomcs/mfag015","DOIUrl":"10.1093/mtomcs/mfag015","url":null,"abstract":"Zinc is an essential trace element, yet how graded dietary zinc intake reshapes tissue-specific distributions of zinc and other essential metals remains incompletely understood. This study investigated the impact of dietary zinc ranging from deficiency to high supplementation on the metallomic profile of C57BL/6 J mice. Mice were fed one of five zinc diets for 3 or 6 weeks, after which zinc status and related elements (copper, iron, manganese, calcium, and magnesium) were quantified in serum and multiple tissues by inductively coupled plasma-optical emission spectrometry, alongside expression of zinc transporter and metal-related genes in intestinal segments. Tissue zinc responses differed strongly across organs. Serum zinc increased only after prolonged supplementation, the colon and small intestine showed rapid and pronounced shifts with both deficiency and excess, brain and skeletal muscle regions displayed selective sensitivity, and liver and kidney zinc remained comparatively stable, consistent with strong homeostatic control. Dietary zinc did not deplete tissue copper but instead showed positive associations between zinc and copper in several tissues. We also observed co-ordinated and tissue-dependent relationships between zinc and iron, manganese, calcium, and magnesium, which challenges the traditional view that mineral interactions are uniformly antagonistic. When we integrated elemental and gene expression data and explicitly linked metal responses to measured tissue zinc levels, we identified segment-specific and transporter-specific adaptations that support a model in which dietary zinc reorganizes local and systemic mineral balance. This reorganization reflects both changes in tissue zinc levels and additional regulatory mechanisms in metal transport and storage that are not apparent from whole-tissue zinc measurements alone.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148154614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Speciation-dependent intracellular reduction and nanostructure formation of selenium and tellurium in unicellular algae. 单细胞藻类中硒和碲的种类依赖性胞内还原和纳米结构形成。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag014

Kohei Odaka, Kensuke Inaba, Yugo Takeuchi, Keita Hiraka, Daisuke Ogawa, Hirokazu Sugimori, Kazuhiro Kumagai, Akiko Hokura

{"title":"Speciation-dependent intracellular reduction and nanostructure formation of selenium and tellurium in unicellular algae.","authors":"Kohei Odaka, Kensuke Inaba, Yugo Takeuchi, Keita Hiraka, Daisuke Ogawa, Hirokazu Sugimori, Kazuhiro Kumagai, Akiko Hokura","doi":"10.1093/mtomcs/mfag014","DOIUrl":"10.1093/mtomcs/mfag014","url":null,"abstract":"Understanding how chalcogen elements taken up by biological systems change their chemical speciation is essential for elucidating their intracellular behaviour. However, knowledge of the uptake and transformation of selenium and tellurium oxyanions in unicellular algae remains limited. In this study, selenium and tellurium oxyanions in different oxidation states (VI or IV) were added to two unicellular algae, Chlamydomonas reinhardtii and Pseudococcomyxa simplex, and their intracellular accumulation and chemical speciation were systematically investigated. X-ray absorption fine structure analysis revealed that both selenium and tellurium underwent intracellular reduction irrespective of their initial oxidation states. However, the extent of reduction, accumulation efficiency, and final chemical speciation differed markedly depending on both the oxidation state of the added oxyanion and the algal species, indicating shared yet species-dependent intracellular transformation patterns. In particular, tetravalent oxyanions (selenite and tellurite) underwent more rapid reduction and exhibited higher cellular accumulation than the corresponding hexavalent species in both algae, although the extent and kinetics of reduction differed markedly between species. Scanning and transmission electron microscopy demonstrated that selenium was immobilized as spherical elemental nanoparticles, whereas tellurium formed needle-like metallic nanorods within algal cells. Under hexavalent selenate exposure, higher-valent and organoselenium species remained detectable, and the formation of elemental selenium nanoparticles was limited. These results demonstrated speciation- and species-dependent intracellular transformation and accumulation of selenium and tellurium in unicellular algae, providing chemical speciation-based insights into algal chalcogen metabolism and detoxification processes.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13201907/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147808683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The PBAF chromatin remodeling complex contributes to metal homeostasis through MTF1 regulation. PBAF染色质重塑复合体通过MTF1调控参与金属稳态。

IF 2.9 3区生物学

Metallomics Pub Date : 2026-01-31 DOI: 10.1093/mtomcs/mfag019

Nick Carulli, Emma E Johnston, David C Klein, Odette Verdejo-Torres, Anand Parikh, Arianna McDaniels, Antonio Rivera, Michael Quinteros, Aidan T Pezacki, Christopher J Chang, Sarah J Hainer, Teresita Padilla-Benavides

{"title":"The PBAF chromatin remodeling complex contributes to metal homeostasis through MTF1 regulation.","authors":"Nick Carulli, Emma E Johnston, David C Klein, Odette Verdejo-Torres, Anand Parikh, Arianna McDaniels, Antonio Rivera, Michael Quinteros, Aidan T Pezacki, Christopher J Chang, Sarah J Hainer, Teresita Padilla-Benavides","doi":"10.1093/mtomcs/mfag019","DOIUrl":"10.1093/mtomcs/mfag019","url":null,"abstract":"Chromatin remodeling by SWI/SNF complexes is essential for transcriptional regulation, yet how distinct SWI/SNF subcomplexes contribute to cellular stress responses remains incompletely understood. Here, we identify a specific role for the PBAF subunit Baf180 in regulating metal-responsive transcription and adaptation to metal stress in proliferating myoblasts. While knockdown (KD) of the BAF-specific subunit Baf250a or the ncBAF-specific subunit Brd9 significantly impairs myoblast proliferation, KD of the PBAF-specific subunit Baf180 has no effect under basal conditions. Notably, supplementation with copper (Cu) or zinc (Zn) restores proliferative capacity in Baf250a- and Brd9-deficient myoblasts. In contrast, Baf180-depleted myoblasts exhibit impaired proliferation upon metal exposure, accompanied by selective dysregulation of genes involved in Cu and Zn homeostasis. Transcriptomic and chromatin profiling further reveal that loss of Baf180 alters the activity of metal-regulatory transcription factor 1 (MTF1), including reduced chromatin occupancy at metal-responsive loci. Together, these findings support a model in which PBAF promotes metal-responsive gene regulation to maintain metal homeostasis and sustain myoblast proliferation, uncovering a previously unrecognized link between nucleosome remodeling and metal homeostasis during muscle cell proliferation.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13294679/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148160987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0