Biochimica et Biophysica Acta-Bioenergetics最新文献

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Mitochondrial reactive oxygen species production in lungs of rats with different susceptibilities to hyperoxia-induced acute lung injury 不同高氧诱导急性肺损伤易感性大鼠肺组织线粒体活性氧生成的研究。
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-11-01 Epub Date: 2025-06-12 DOI: 10.1016/j.bbabio.2025.149561
Pardis Taheri , Devanshi D. Dave , Abraham Taye , Anne V. Clough , Elizabeth R. Jacobs , Ranjan K. Dash , Said H. Audi
{"title":"Mitochondrial reactive oxygen species production in lungs of rats with different susceptibilities to hyperoxia-induced acute lung injury","authors":"Pardis Taheri ,&nbsp;Devanshi D. Dave ,&nbsp;Abraham Taye ,&nbsp;Anne V. Clough ,&nbsp;Elizabeth R. Jacobs ,&nbsp;Ranjan K. Dash ,&nbsp;Said H. Audi","doi":"10.1016/j.bbabio.2025.149561","DOIUrl":"10.1016/j.bbabio.2025.149561","url":null,"abstract":"<div><div>Adult rats exposed to hyperoxia (&gt;95 % O<sub>2</sub>) die within 60–72 h from respiratory failure. However, when preconditioned with either &gt;95 % O<sub>2</sub> for 48 h followed by 24 h in room air (H-T) or 60 % O<sub>2</sub> for 7 days (H-S), they acquire tolerance or susceptibility to hyperoxia, respectively. The aim was to quantify H<sub>2</sub>O<sub>2</sub> production rate and identify sources in isolated lung mitochondria and isolated perfused lungs (IPLs) of normoxia, H-T, and H-S rats. Mitochondria were isolated from lungs, and H<sub>2</sub>O<sub>2</sub> production rates were quantified in the presence of pyruvate-malate or succinate, with and without inhibitors of mitochondrial complex I (CI), complex II (CII), and/or H<sub>2</sub>O<sub>2</sub> scavenging systems. Lung rate of H<sub>2</sub>O<sub>2</sub> release was quantified in IPLs with and without CII inhibitor. Results from isolated mitochondria show that CII is the main H<sub>2</sub>O<sub>2</sub> source, and that both H<sub>2</sub>O<sub>2</sub> production rate and scavenging capacity were ~48 % lower in H-S mitochondria compared to normoxia. Results from IPLs show that CII is also the dominant H<sub>2</sub>O<sub>2</sub> source from lung tissue, and that H<sub>2</sub>O<sub>2</sub> release rate was lower in H-T lungs compared to normoxia and H-S lungs. These results suggest that for H-S rats, both mitochondrial rate of H<sub>2</sub>O<sub>2</sub> production and scavenging capacity were significantly lower than those in normoxia mitochondria and may contribute to their increased hyperoxia susceptibility. The lower H<sub>2</sub>O<sub>2</sub> release rate from H-T IPLs, along with no change in mitochondrial H<sub>2</sub>O<sub>2</sub> production rate, is consistent with higher antioxidant capacity in the lungs of H-T rats, which may contribute to their hyperoxia tolerance.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 4","pages":"Article 149561"},"PeriodicalIF":3.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144295269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Chamber oxygen concentration impacts mitochondrial function and hydrogen peroxide appearance in permeabilized human skeletal muscle fibers 室内氧浓度影响线粒体功能和过氧化氢的外观在渗透人骨骼肌纤维
IF 2.7 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-11-01 Epub Date: 2025-08-11 DOI: 10.1016/j.bbabio.2025.149568
Bradley A. Ruple , Soung Hun Park , Jesse C. Craig , Matthew T. Lewis , Joel D. Trinity , Russell S. Richardson , Ryan M. Broxterman
{"title":"Chamber oxygen concentration impacts mitochondrial function and hydrogen peroxide appearance in permeabilized human skeletal muscle fibers","authors":"Bradley A. Ruple ,&nbsp;Soung Hun Park ,&nbsp;Jesse C. Craig ,&nbsp;Matthew T. Lewis ,&nbsp;Joel D. Trinity ,&nbsp;Russell S. Richardson ,&nbsp;Ryan M. Broxterman","doi":"10.1016/j.bbabio.2025.149568","DOIUrl":"10.1016/j.bbabio.2025.149568","url":null,"abstract":"<div><div>Skeletal muscle mitochondrial respiration is commonly assessed ex vivo using permeabilized fibers in media with high oxygen (O<sub>2</sub>) concentrations to ensure that O<sub>2</sub> availability does not limit respiration. However, high O<sub>2</sub> concentrations also increase the production of reactive O<sub>2</sub> species that can negatively affect respiration. In this study, we tested the hypotheses that permeabilized fiber mitochondria in a high, compared to low, O<sub>2</sub> concentration would (i) not be different at maximal state 3 respiration rate (V<sub>max</sub>), (ii) have lower submaximal respiration rates at submaximal O<sub>2</sub> concentrations, and (iii) have greater total cumulative hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) appearance. We continuously monitored mitochondrial state 3 respiration and H<sub>2</sub>O<sub>2</sub> appearance rates using high-resolution respirometry in permeabilized skeletal muscle fibers (12 untrained participants; 22 ± 4 yrs) with either control (~127 mmHg; CON) or high (~327 mmHg; HIGH) partial pressures of O<sub>2</sub> (PO<sub>2</sub>). V<sub>max</sub> was not different between conditions (HIGH: 80.7 ± 16.7 vs. CON: 82.3 ± 18.7 pmol/s/mg, <em>p</em> = 0.695). The PO<sub>2</sub> at 80 % V<sub>max</sub> (P<sub>80</sub>) was greater in HIGH (73.9 ± 25.5 vs. 28.0 ± 7.1 mmHg, <em>p</em> &lt; 0.001) and respiration rates at 5–60 mmHg PO<sub>2</sub> were lower for HIGH than CON (all <em>p</em> &lt; 0.001). Additionally, the total cumulative H<sub>2</sub>O<sub>2</sub> appearance was greater in HIGH than CON (<em>n</em> = 11; 51.5 ± 23.2 vs. 18.3 ± 10.3 pmol/mg, <em>p</em> &lt; 0.001), and this difference was directly correlated with the difference in P<sub>80</sub> (<em>r</em> = 0.655, <em>p</em> = 0.029). The current findings support that a high O<sub>2</sub> concentration, by itself, does not appear to affect V<sub>max</sub> in the permeabilized skeletal muscle fiber preparation, but the corollary increase in H<sub>2</sub>O<sub>2</sub> exposure may diminish mitochondrial state 3 respiratory function.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 4","pages":"Article 149568"},"PeriodicalIF":2.7,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144842126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Conformational dynamics of a histidine molecular switch in a cation/proton antiporter 阳离子/质子反转运体中组氨酸分子开关的构象动力学
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-11-01 Epub Date: 2025-06-17 DOI: 10.1016/j.bbabio.2025.149563
Cristina Pecorilla , Anton Altmeyer , Outi Haapanen , Yongchan Lee , Volker Zickermann , Vivek Sharma
{"title":"Conformational dynamics of a histidine molecular switch in a cation/proton antiporter","authors":"Cristina Pecorilla ,&nbsp;Anton Altmeyer ,&nbsp;Outi Haapanen ,&nbsp;Yongchan Lee ,&nbsp;Volker Zickermann ,&nbsp;Vivek Sharma","doi":"10.1016/j.bbabio.2025.149563","DOIUrl":"10.1016/j.bbabio.2025.149563","url":null,"abstract":"<div><div>Multisubunit Mrp (<u>m</u>ultiple <u>r</u>esistance and <u>p</u>H adaptation) type sodium proton antiporters are indispensable for the growth of alkali and salt tolerant bacteria and archaea. They share sequence and structural similarity with the membrane domain of respiratory complex I, a key mitochondrial enzyme. The molecular mechanism of complex I and Mrp antiporters has remained largely unknown and is the subject of intense debate. Here, by combining site-directed mutagenesis with large-scale molecular dynamics simulations, we explore the conformational dynamics of a key histidine residue in the MrpA subunit of the antiporter. We show that point mutations perturbing the conformational mobility of the histidine sidechain directly affect the transport activity of the antiporter. We identify that protonation state variations in conserved lysine residues around the histidine drive hydrogen bonding rearrangements and hydration changes coupled to sidechain and backbone conformational dynamics. Finally, we develop detailed and testable mechanistic models of proton transfer in Mrp antiporter and complex I, in which the histidine switch functions as a unique gating element.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 4","pages":"Article 149563"},"PeriodicalIF":3.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Deletion of AC8 in glioma cells elevates oxidative phosphorylation by system-wide remodeling of the mitochondrial proteome 胶质瘤细胞中AC8的缺失通过线粒体蛋白质组的全系统重塑提高氧化磷酸化。
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-11-01 Epub Date: 2025-07-14 DOI: 10.1016/j.bbabio.2025.149567
Emil Jakobsen , Jacob M. Bech , Jens V. Andersen , Emil W. Westi , Martin R. Larsen , Niels H. Skotte , José M.A. Moreira , Blanca I. Aldana , Lasse K. Bak
{"title":"Deletion of AC8 in glioma cells elevates oxidative phosphorylation by system-wide remodeling of the mitochondrial proteome","authors":"Emil Jakobsen ,&nbsp;Jacob M. Bech ,&nbsp;Jens V. Andersen ,&nbsp;Emil W. Westi ,&nbsp;Martin R. Larsen ,&nbsp;Niels H. Skotte ,&nbsp;José M.A. Moreira ,&nbsp;Blanca I. Aldana ,&nbsp;Lasse K. Bak","doi":"10.1016/j.bbabio.2025.149567","DOIUrl":"10.1016/j.bbabio.2025.149567","url":null,"abstract":"<div><div>The Warburg effect is the reprogramming of cancer cells towards glycolytic metabolism, likely producing and releasing lactate into the tumor microenvironment. This lactate has been suggested to partly drive tumor growth by signaling through the lactate receptor, GPR81. Thus, reprogramming cancer cells away from glycolytic activity may be beneficial for cancer treatment. Here, we show that deletion of <em>ADCY8</em> (coding for adenylyl cyclase 8; AC8) employing the CRISPR-Cas9 technology in U87MG glioma cells, changes the proteome of these cells through a system-wide transformation in expression of mitochondrial proteins. These changes shift the metabolic balance towards oxidative phosphorylation, as shown by an increase in oxygen consumption, an elevation in tricarboxylic acid cycle flux, and a concomitant decrease in glycolytic flux. This metabolic shift is likely driven by the absence of AC8-mediated transcriptional regulation and may suggest that inhibition of AC8 activity could hold therapeutic potential in the treatment of cancer.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 4","pages":"Article 149567"},"PeriodicalIF":3.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144651137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
ATP requirements for growth reveal the bioenergetic impact of mitochondrial symbiosis 生长所需的ATP揭示了线粒体共生的生物能影响。
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-11-01 Epub Date: 2025-06-23 DOI: 10.1016/j.bbabio.2025.149564
William F. Martin
{"title":"ATP requirements for growth reveal the bioenergetic impact of mitochondrial symbiosis","authors":"William F. Martin","doi":"10.1016/j.bbabio.2025.149564","DOIUrl":"10.1016/j.bbabio.2025.149564","url":null,"abstract":"<div><div>Studies by microbiologists in the 1970s provided robust estimates for the energy supply and demand of a prokaryotic cell. The amount of ATP needed to support growth was calculated from the chemical composition of the cell and known enzymatic pathways that synthesize its constituents from known substrates in culture. Starting in 2015, geneticists and evolutionary biologists began investigating the bioenergetic role of mitochondria at eukaryote origin and energy in metazoan evolution using their own, widely trusted—but hitherto unvetted—model for the costs of growth in terms of ATP per cell. The more recent model contains, however, a severe and previously unrecognized error that systematically overestimates the ATP cost of amino acid synthesis up to 200-fold. The error applies to all organisms studied by such models and leads to conspicuously false inferences, for example that the synthesis of an average amino acid in humans requires 30 ATP, which no biochemistry textbook will confirm. Their ATP ‘cost’ calculations would require that <em>E. coli</em> obtains ~100 ATP per glucose and that mammals obtain ~240 ATP per glucose, untenable propositions that invalidate and void all evolutionary inferences so based. By contrast, established methods for estimating the ATP cost of microbial growth show that the first mitochondrial endosymbionts could have easily doubled the host's available ATP pool, provided (i) that genes for growth on environmental amino acids were transferred from the mitochondrial symbiont to the archaeal host, and (ii) that the host for mitochondrial origin was an autotroph using the acetyl-CoA pathway. Stated in simple terms, the significance of these findings are this: Life is a chemical reaction. It requires energy release in order to proceed. The currency of energy in cells is adenosine triphosphate, ATP. Five decades ago, microbiologists were able to measure and understand the amount of ATP that cells require to grow. New studies by evolutionary biologists have appeared in the meantime that brush aside the older microbiological findings, using their own methods to calculate the ATP cost of growth instead. Science is, however, an imperfect undertaking. The new studies contain a major error, similar to conflating centimeters with yards. The error affects many publications and their conclusions. Using the old methods, we can still meaningfully study the role of energy in evolution, including the origin of complex, nucleus-bearing cells.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 4","pages":"Article 149564"},"PeriodicalIF":3.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144499075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Differential effects of the D1/S264V mutation in photosystem II with either PsbA1 or PsbA3 on QB, non-heme Iron, and the associated hydrogen-bond network PsbA1或PsbA3光系统II D1/S264V突变对QB、非血红素铁和相关氢键网络的差异影响
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-08-01 Epub Date: 2025-05-19 DOI: 10.1016/j.bbabio.2025.149557
Kosuke Tada , Kaho Yamagata , Kazumi Koyama , Julien Sellés , Alain Boussac , Miwa Sugiura
{"title":"Differential effects of the D1/S264V mutation in photosystem II with either PsbA1 or PsbA3 on QB, non-heme Iron, and the associated hydrogen-bond network","authors":"Kosuke Tada ,&nbsp;Kaho Yamagata ,&nbsp;Kazumi Koyama ,&nbsp;Julien Sellés ,&nbsp;Alain Boussac ,&nbsp;Miwa Sugiura","doi":"10.1016/j.bbabio.2025.149557","DOIUrl":"10.1016/j.bbabio.2025.149557","url":null,"abstract":"<div><div>The role of the D1/S264 residue and the role of its environment in the proton-coupled electron transfer reaction on the acceptor side of Photosystem II were investigated. To this end, D1/S264V mutants were constructed in the thermophilic cyanobacterium <em>Thermosynechococcus elongatus</em>, with D1 being either PsbA1 or PsbA3. The PSII mutants were investigated using EPR spectroscopy, thermoluminescence, (time-resolved) absorption changes measurements, and oximetry. While the mutation had minor effects in PsbA1-PSII, the S264V mutation in PsbA3-PSII had significant consequences: <em>i</em>) thermoluminescence data show inefficient electron transfer from Q<sub>A</sub><sup>−</sup> to Q<sub>B</sub>; <em>ii</em>) re-oxidation of Q<sub>A</sub><sup>−</sup> was slowed, by at least a factor of 10; <em>iii</em>) the herbicides inhibit weakly O<sub>2</sub> evolution; <em>iv</em>) no Fe<sup>2+</sup>Q<sub>B</sub><sup>−</sup> EPR signal was detected in dark-adapted PSII; instead, <em>v</em>) a large Fe<sup>3+</sup> signal was present with <em>vi</em>) modified EPR properties; <em>vii</em>) no Q<sub>A</sub><sup>−</sup>Fe<sup>2+</sup>Q<sub>B</sub><sup>−</sup> biradical signal was observed after illumination at 198 K following a flash illumination, confirming the inefficient formation of Q<sub>B</sub><sup>−</sup>; <em>viii</em>) either no proton uptake coupled to non-heme iron reduction occurred or with a very slow rate compared to PsbA3-PSII; <em>ix</em>) changes were noted in the electrochromic response associated with Q<sub>A</sub><sup>−</sup> formation; and <em>x</em>) increased production of singlet oxygen, both with and without herbicides. The S264V mutation in PsbA3-PSII leads to a significant decrease in the energy gap between the Q<sub>A</sub><sup>−</sup>Q<sub>B</sub> and Q<sub>A</sub>Q<sub>B</sub><sup>−</sup> states. The effects listed above are discussed regarding the differences between PsbA1-PSII and PsbA3-PSII as those related to the sulfoquinovosyldiacylglycerol, the water molecules and the H-bond network.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 3","pages":"Article 149557"},"PeriodicalIF":3.4,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Three's company: Membrane waltz among organelles 三人行细胞器之间的膜华尔兹
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-08-01 Epub Date: 2025-04-01 DOI: 10.1016/j.bbabio.2025.149555
Valentin Guyard, Francesca Giordano
{"title":"Three's company: Membrane waltz among organelles","authors":"Valentin Guyard,&nbsp;Francesca Giordano","doi":"10.1016/j.bbabio.2025.149555","DOIUrl":"10.1016/j.bbabio.2025.149555","url":null,"abstract":"<div><div>The study of membrane contact sites (MCS) has profoundly transformed our understanding of inter-organelle communication. These sites, where the membranes of two organelles are closely apposed, facilitate the transfer of small molecules such as lipids and ions. They are especially crucial for the maintenance of the structure and function of organelles like mitochondria and lipid droplets, which are largely excluded from vesicular trafficking. The significant advancements in imaging techniques, and molecular and cell biology research have shown that MCS are more complex than what originally thought and can involve more than two organelles. This has revealed the intricate nature and critical importance of these subcellular connections.</div><div>Here, we provide an overview of newly described three-way inter-organelles associations, and the proteins involved in these MCS. We highlight the roles these contacts play in key cellular processes such as lipid droplet biogenesis and mitochondrial division. Additionally, we discuss the latest advances in super-resolution imaging that enable the study of these complex three-way interactions. Ongoing research, driven by technological innovations, promises to uncover further insights into their roles in fundamental cellular processes and their implications for health and disease.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 3","pages":"Article 149555"},"PeriodicalIF":3.4,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143781799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Adenine nucleotide-dependent Ca2+ buffering by mitochondria in an inorganic phosphate-free medium 线粒体在无机无磷酸盐培养基中的腺嘌呤核苷酸依赖性Ca2+缓冲作用
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-08-01 Epub Date: 2025-05-26 DOI: 10.1016/j.bbabio.2025.149559
Anna.B. Nikiforova, Maxim.V. Molchanov, Alexey G. Kruglov
{"title":"Adenine nucleotide-dependent Ca2+ buffering by mitochondria in an inorganic phosphate-free medium","authors":"Anna.B. Nikiforova,&nbsp;Maxim.V. Molchanov,&nbsp;Alexey G. Kruglov","doi":"10.1016/j.bbabio.2025.149559","DOIUrl":"10.1016/j.bbabio.2025.149559","url":null,"abstract":"<div><div>Inorganic phosphate (P<sub>i</sub>) is essential for Ca<sup>2+</sup> buffering by mitochondria. Adenine nucleotides (AN) are known to strongly increase the Ca<sup>2+</sup>-retention capacity (CRC) of mitochondria even in the absence of P<sub>i</sub> in the medium. Several mechanisms can explain this phenomenon. Here we examined these mechanisms in detail in isolated rat liver mitochondria. We found that, in P<sub>i</sub>-free medium, AN dose-dependently increased the CRC. The F<sub>O</sub>F<sub>1</sub>-ATP synthase (F-ATPase) inhibitor oligomycin decreased the CRC and the Ca<sup>2+</sup> uptake rate to a minor extent. Nuclear magnetic resonance (NMR) analysis showed that P<sub>i</sub> in suspensions of oligomycin-treated mitochondria was formed due to AN hydrolysis. In the absence and presence of Ca<sup>2+</sup>, mitochondria accumulated small and large (50 and &gt; 1000 nmol/mg protein) amounts of Pi, respectively, without detectable accumulation of AN. The average ratio of Ca<sup>2+</sup> to P<sub>i</sub> accumulated by intact mitochondria in the presence of ADP, ATP, and ATP plus P<sub>i</sub> was about 0.68, 1, and 1.25, respectively, or lower. These values correspond to the formation of calcium dihydrogen and hydrogen orthophosphates, and tricalcium phosphate/whitlockite in different proportions. AN increased the CRC in the presence of inhibitors of both F-ATPase and adenylate translocase, the known regulators of the permeability transition pore (PTP). The PTP inhibitor NADH did not increase the CRC in the absence of P<sub>i</sub>. Thus, the mechanism of the AN-dependent increase in the CRC in the absence of P<sub>i</sub> includes the F-ATPase-independent production of P<sub>i</sub> and suppression of the PTP at the site other than F-ATPase and adenylate translocase.</div></div>","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 3","pages":"Article 149559"},"PeriodicalIF":3.4,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144146874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Corrigendum to “New insights into the involvement of residue D1/V185 in Photosystem II function in Synechocystis 6803 and Thermosynechococcus vestitus” [Biochim. Biophys. Acta Bioenerg. 1866 (2025) 149550] “残基D1/V185参与聚囊菌6803和残留热聚球菌光系统II功能的新认识”[生物化学]的更正。Biophys。生物质化学工程学报,2004,24(2):444 - 444。
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-08-01 Epub Date: 2025-05-26 DOI: 10.1016/j.bbabio.2025.149558
Alain Boussac , Julien Sellés , Tania Tibiletti , Miwa Sugiura , Robert L. Burnap
{"title":"Corrigendum to “New insights into the involvement of residue D1/V185 in Photosystem II function in Synechocystis 6803 and Thermosynechococcus vestitus” [Biochim. Biophys. Acta Bioenerg. 1866 (2025) 149550]","authors":"Alain Boussac ,&nbsp;Julien Sellés ,&nbsp;Tania Tibiletti ,&nbsp;Miwa Sugiura ,&nbsp;Robert L. Burnap","doi":"10.1016/j.bbabio.2025.149558","DOIUrl":"10.1016/j.bbabio.2025.149558","url":null,"abstract":"","PeriodicalId":50731,"journal":{"name":"Biochimica et Biophysica Acta-Bioenergetics","volume":"1866 3","pages":"Article 149558"},"PeriodicalIF":3.4,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144163501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Expansion microscopy reveals thylakoid organisation alterations due to genetic mutations and far-red light acclimation 扩增显微镜显示由于基因突变和远红光驯化引起的类囊体组织改变。
IF 3.4 2区 生物学
Biochimica et Biophysica Acta-Bioenergetics Pub Date : 2025-08-01 Epub Date: 2025-03-13 DOI: 10.1016/j.bbabio.2025.149552
Jarne Berentsen, Peter R. Bos, Emilie Wientjes
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