Abstract：
:Hydroxyl radical (HO•) production in photosystem II (PSII) was studied by electron paramagnetic resonance (EPR) spin-trapping technique. It is demonstrated here that the exposure of PSII membranes to heat stress (40 °C) results in HO• formation, as monitored by the formation of EMPO-OH adduct EPR signal. The presence of different exogenous halides significantly suppressed the EMPO-OH adduct EPR signal in PSII membranes under heat stress. The addition of exogenous acetate and blocker of chloride channel suppressed the EMPO-OH adduct EPR signal, whereas the blocker of calcium channel did not affect the EMPO-OH adduct EPR signal. Heat-induced hydrogen peroxide (H₂O₂) production was studied by amplex red fluorescent assay. The presence of exogenous halides, acetate and chloride blocker showed the suppression of H₂O₂ production in PSII membranes under heat stress. Based on our results, it is proposed that the formation of HO• under heat stress is linked to uncontrolled accessibility of water to the water-splitting manganese complex caused by the release of chloride ion on the electron donor side of PSII. Uncontrolled water accessibility to the water-splitting manganese complex causes the formation of H₂O₂ due to improper water oxidation, which leads to the formation of HO• via the Fenton reaction under heat stress.
journal_name
J Bioenerg Biomembrjournal_title
Journal of bioenergetics and biomembranesauthors
Yadav DK,Pospíšil Pdoi
10.1007/s10863-012-9433-4subject
Has Abstractpub_date
2012-06-01 00:00:00pages
365-72issue
3eissn
0145-479Xissn
1573-6881journal_volume
44pub_type
杂志文章abstract：:The advantages of using bacterial systems to study the mechanism and function of cytochrome bc (1) complexes do not extend readily to their structural investigations. High quality crystals of bacterial complexes have been difficult to obtain despite the enzymes' smaller sizes and simpler subunit compositions compared ...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-008-9180-8
更新日期：2008-10-01 00:00:00
abstract：:Mitochondrial reactive oxygen species (ROS) production was investigated in mitochondria extracted from liver of rats treated with or without metformin, a mild inhibitor of respiratory chain complex 1 used in type 2 diabetes. A high rate of ROS production, fully suppressed by rotenone, was evidenced in non-phosphorylat...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-006-9003-8
更新日期：2006-02-01 00:00:00
abstract：:Caloric restriction (CR) is widely known to increase life span and resistance to different types of injuries in several organisms. We have previously shown that mitochondria from livers or brains of CR animals exhibit higher calcium uptake rates and lower sensitivity to calcium-induced mitochondrial permeability trans...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-020-09838-4
更新日期：2020-08-01 00:00:00
abstract：:Specific molecular interactions that determine many of the functions of a biomembrane have a high probability of occurring at the surface of that membrane. However, unlike their hydrophobic core, the polar-apolar interface of biomembranes has been somewhat neglected experimentally. Reasons for this are that the chemic...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00762300
更新日期：1987-12-01 00:00:00
abstract：:The role of nucleoside diphosphate (NDP) kinase with special reference to mammalian signal transduction systems was described. The interaction between NDP kinases and G proteins was reevaluated in view of their protein structural information and its significance was extended further on the basis of recent findings obt...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1023/a:1023489722460
更新日期：2003-02-01 00:00:00
abstract：:The chronology of the major discoveries important in elucidating certain aspects of the molecular basis of transmembrane signaling is briefly reviewed. Recent developments linking cell stimulation and transformation are intimated. ...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00768835
更新日期：1991-02-01 00:00:00
abstract：:Hepatic iron toxicity because of iron overload seems to be mediated by lipid peroxidation of biological membranes and the associated organelle dysfunctions. However, the basic mechanisms underlying this process in vivo are still little understood. Gerbils were dosed with weekly injections of iron-dextran alone or in c...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1023/a:1005512014280
更新日期：2000-04-01 00:00:00
abstract：:Electron transport from Photosystem II to Photosystem I of spinach chloroplasts can be stimulated by bicarbonate and various carbonyl or carboxyl compounds. Monovalent or divalent cations, which have hitherto been implicated in the energy distribution between the two photosystems, i.e., "spillover" phenomena at low li...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/BF00744683
更新日期：1980-08-01 00:00:00
abstract：:Gap junction channels have long been viewed as static structures containing a large-diameter, aqueous pore. This pore has a high permeability to hydrophilic molecules of approximately 900 daltons in molecular weight and a weak ionic selectivity. The evidence leading to these conclusions is reviewed in the context of m...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF02110109
更新日期：1996-08-01 00:00:00
abstract：:Bacillus subtilis has a bifurcated respiratory chain composed of a cytochrome branch and a quinol oxidase branch. The respiratory complexes of this bacterium have been elucidated mostly by the analysis of the genome and by the isolation of individual complexes. The supramolecular organization of this respiratory chain...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-012-9454-z
更新日期：2012-08-01 00:00:00
abstract：:Epilepsy is a neurological disorder characterized by spontaneous, recurrent and paroxysmal cerebral discharge, clinically leading to persistent alterations in function and morphology of neurons. Oxidative stress is one of possible mechanisms in the pathogenesis of epilepsy. Oxidative stress resulting from mitochondria...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/s10863-010-9317-4
更新日期：2010-12-01 00:00:00
abstract：:Gramicidin A forms ion-conducting channels which can traverse the hydrocarbon core of lipid bilayer membranes. The structures formed by gramicidin A are among the best characterized of all membrane-bound polypeptides or proteins. In this review a brief summary is given of the occurrence, conformation, and synthesis of...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00762301
更新日期：1987-12-01 00:00:00
abstract：:P-glycoprotein (Pgp), the ATP-binding cassette (ABC) transporter, confers multidrug resistance to cancer cells by extruding cytotoxic natural product amphipathic drugs using the energy of ATP hydrolysis. Our studies are directed toward understanding the mechanism of action of Pgp and recent work deals with the assessm...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1023/a:1012875105006
更新日期：2001-12-01 00:00:00
abstract：:Mitochondria, isolated from the ubiquinone-deficient nuclear mutant of Saccharomyces cerevisiae E3-24, are practically unable to oxidize exogenous substrates. Respiratory activity, coupled to ATP synthesis, can, however, be reconstituted by the simple addition of ethanolic solutions of ubiquinones. A minimal length of...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/BF00745017
更新日期：1982-06-01 00:00:00
abstract：:In this review, I focus on the bioenergetics of the methanogenic bacteria, with particular attention directed to the roles of transmembrane electrochemical gradients of sodium and proton. In addition, the mechanism of coupling ATP synthesis to methanogenic electron transfer is addressed. Evidence is reviewed which sug...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00762689
更新日期：1989-12-01 00:00:00
abstract：:In the mitochondrial F(O)F(1) ATP-synthase/ATPase complex, subunits α and β are part of the extrinsic portion that catalyses ATP synthesis. Since there are no reports about genes and proteins from these subunits in crustaceans, we analyzed the cDNA sequences of both subunits in the whiteleg shrimp Litopenaeus vannamei...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-011-9340-0
更新日期：2011-04-01 00:00:00
abstract：:The 8-kDa subunit c of the E. coli F0 ATP-synthase proton channel was tested for Ca++ binding activity using a 45Ca++ ligand blot assay after transferring the protein from SDS-PAGE gels onto polyvinyl difluoride membranes. The purified subunit c binds 45Ca++ strongly with Ca++ binding properties very similar to those ...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/BF02110438
更新日期：1996-12-01 00:00:00
abstract：:Recent studies of isolated muscle membrane have enabled induction and monitoring of rapid Ca2+ release from sarcoplasmic reticulum (SR)5 in vitro by a variety of methods. On the other hand, various proteins that may be directly or indirectly involved in the Ca2+ release mechanism have begun to be unveiled. In this min...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00812071
更新日期：1989-04-01 00:00:00
abstract：:The topology of beef heart Complex III has been studied by tryptic and chymotryptic digestion of isolated Complex III, Mg2+-ATP submitochondrial particles, and mitoplasts. Degradation products were detected by the immunoreplication technique using specific antibodies against core protein 1 (50 K) and core protein 2 (4...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/BF00743485
更新日期：1983-02-01 00:00:00
abstract：:We have studied the effect of general anesthetics on the mobility of two stearic acid spin labels (5-doxyl stearic acid and 16-doxyl stearic acid) in bovine heart mitochondria and in phospholipid vesicles made from either mitochondrial lipids or commercial soybean phospholipids. The general anesthetics used include no...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/BF00743158
更新日期：1979-04-01 00:00:00
abstract：:The total amount of cellular mitochondrial DNA (mtDNA) varies widely and seems to be related to the nature and metabolic state of tissues and cells in culture. It is not known, however, whether this variation has any significance in vivo, and to which extent it regulates energy production. To better understand the imp...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-008-9130-5
更新日期：2008-04-01 00:00:00
abstract：:The ATP-binding cassette (ABC) family of membrane transport proteins is the largest class of transporters in humans (48 members). The majority of ABC transporters function at the cell surface. Therefore, defective folding and trafficking of the protein to the cell surface can lead to serious health problems. The class...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/s10863-005-9499-3
更新日期：2005-12-01 00:00:00
abstract：:Phospholysine phosphohistidine inorganic pyrophosphate phosphatase (LHPP) has been recently identified as a novel inhibitor of multiple tumors; however, its role in glioblastoma (GBM) has not been investigated. This study aimed to evaluate whether LHPP exerts a potential tumor-inhibiting role in GBM. Compared with tha...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章
doi：10.1007/s10863-020-09866-0
更新日期：2021-02-01 00:00:00
abstract：:The inner membrane of yeast and mammalian mitochondria has been studied in situ with a patch clamp electrode. Anion channels were found in both cases, although their behavior and regulation are different. In mammalian mitochondria, the principal channel is of around 100 pS conductance and opens mainly under depolarize...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF02110642
更新日期：1996-04-01 00:00:00
abstract：:The past 5 years has witnessed an advance in our understanding of alpha1G (Cav3.1), alpha1H (Cav3.2), and alpha11 (Car3.3), the pore-forming subunits of T-type or low-voltage-activated calcium channels (LVAs). LVAs differ in their localization and molecular, biophysical, and biochemical properties, but all conduct a t...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1023/b:jobb.0000008024.77488.48
更新日期：2003-12-01 00:00:00
abstract：:It is proven that any model of localized protonmotive energy coupling that relies upon properties of a homogeneous surface phase must, when operated in the steady state, lead to bulk phase electrochemical potentials for protons that are as large as those required by the delocalized chemiosmotic theory. To obtain model...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00743612
更新日期：1986-02-01 00:00:00
abstract：:The transport systems of animal and human tissues for vitamin C are reviewed with respect to their properties. It emerges that pure diffusion plays only a very minor role while a variety of more or less specific transporters is found on cellular membranes. Although most tissues prefer the reduced ascorbate over the ox...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00762776
更新日期：1994-08-01 00:00:00
abstract：:Mitochondrial impairment has been collecting more and more attention as a contributing factor to the etiology of Parkinson's disease. Above all, the NADH-quinone oxidoreductase, complex I, of the respiratory chain seems to be most culpable. Complex I dysfunction is translated to an increased production of reactive oxy...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/s10863-009-9249-z
更新日期：2009-12-01 00:00:00
abstract：:The respiratory chain of marine and moderately halophilic bacteria requires Na+ for maximum activity, and the site of Na(+)-dependent activation is located in the NADH-quinone reductase segment. The Na(+)-dependent NADH-quinone reductase purified from marine bacterium Vibrio alginolyticus is composed of three subunits...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00762464
更新日期：1993-08-01 00:00:00
abstract：:Porin or voltage-dependent anion-selective channel (VDAC) is the main protein responsible for the high permeability of the outer mitochondrial membrane. The mitochondrial porin is mainly composed of sided beta-strands, in analogy with bacterial porin, whose structure has been resolved at 1.8 A resolution. In mitochond...
journal_title：Journal of bioenergetics and biomembranes
pub_type： 杂志文章,评审
doi：10.1007/BF00769526
更新日期：1992-02-01 00:00:00
