Abstract:
:The protons excreted by plant cells may arise by two different mechanisms: (1) by the action of the plasma membrane H(+)-ATPase and (2) by plasma membrane redox reactions. The exact proportion from each source is not known, but the plasma membrane H(+)-ATPase is, by far, the major contributor to proton efflux. There is still some questions of whether the redox-associated protons produced by NADH oxidation on the inner side of the plasma membrane traverse the membrane in a 1:1 relationship with electrons generated in the redox reactions. Membrane depolarization observed in the presence of ferricyanide reduction by plasma membranes of whole cells or tissues or the lag period between ferricyanide reduction and medium acidification argue that only scalar protons may be involved. The other major argument against tight coupling between protons and electrons involves the concept of strong charge compensation. When ferricyanide is reduced to ferrocyanide on the outside of cells or tissues, an extra negative charge arises, which is compensated for by the release of H+ or K+, so that the total ratio of increased H+ plus K+ equals the electrons transferred by transmembrane electron transport. These are strong arguments against a tight coupling between electrons and protons excreted by the plasma membrane. On the other hand, there is no question that inhibitor studies provide evidence for two mechanisms of proton generation by plasma membranes. When the H(+)-ATPase activity is totally inhibited, the addition of ferricyanide induces a burst of extra proton excretion, or vice versa, when plasma membrane redox reactions are inhibited, the H(+)-ATPase can function normally. Since plasma membrane redox reactions and associated H+ excretion are related to growth it is possible that in plants the ATPase-generated protons have a different function from redox-associated protons. The H(+)-ATPase-generated protons have been considered for many years to be necessary for cell wall expansion, allowing elongation to take place. A special function of the redox-generated protons may be in initiating proliferative cell growth, based on the presence of a hormone-stimulated NADH oxidase in membranes of soybean hypocotyls and stimulation of root growth by low concentrations of oxidants. Here we propose that this NADH oxidase and the redox protons released by its action control growth. The mechanism for this may be the evolution of protons into a special membrane domain, from which a signal to initiate cell proliferation may originate, independent of the action of the H(+)-ATPase-generated protons.(ABSTRACT TRUNCATED AT 400 WORDS)
journal_name
J Bioenerg Biomembrjournal_title
Journal of bioenergetics and biomembranesauthors
Barr Rdoi
10.1007/BF00771014keywords:
subject
Has Abstractpub_date
1991-06-01 00:00:00pages
443-67issue
3eissn
0145-479Xissn
1573-6881journal_volume
23pub_type
杂志文章,评审abstract::The effect of triphenyltin on mitochondrial Ca2+ content was studied. It was found that this trialkyltin compound induces an increase in membrane permeability that leads to Ca2+ release, drop of the transmembrane potential, and efflux of matrix proteins. Interestingly, cyclosporin A was unable to inhibit triphenyltin-...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/BF00762786
更新日期:1994-08-01 00:00:00
abstract::The multi-subunit vacuolar-type H(+)-ATPase consists of a V(1) domain (A-H subunits) catalyzing ATP hydrolysis and a V(0) domain (a, c, c', c", d, e) responsible for H(+) translocation. The mammalian V(0) d subunit is one of the least-well characterized, and its function and position within the pump are still unclear....
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-008-9161-y
更新日期:2008-08-01 00:00:00
abstract::This introductory article and those that follow focus on the roles that mitochondria may have in cancer metastasis (spreading) that all too frequently leads to death of cancer patients. The history of cancer dates back in time to several thousand years BC and continues to this day. Although billions of dollars have be...
journal_title:Journal of bioenergetics and biomembranes
pub_type:
doi:10.1007/s10863-012-9470-z
更新日期:2012-12-01 00:00:00
abstract::The formation of paracrystalline inclusions in mitochondria following postmortem aging in situ is further investigated. Inclusions are found to localize either in the mitochondrial intracristal space or between the inner and outer membrane. The greater majority of the inclusions are of the intracristal type. pH is not...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/BF00743275
更新日期:1977-04-01 00:00:00
abstract::In Propionigenium modestum, ATP is manufactured from ADP and phosphate by the enzyme ATP synthase using the free energy of an electrochemical gradient of Na+ ions. The P. modestum ATP synthase is a clear member of the family of F-type ATP synthases and the only major distinction is an extension of the coupling ion spe...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1023/a:1005608823087
更新日期:2000-10-01 00:00:00
abstract::Precursor proteins destined for the mitochondrial matrix traverse inner and outer organelle membranes in an extended conformation. Translocation events are therefore integrally coupled to the processes of protein unfolding in the cytosol and protein refolding in the matrix. To successfully import proteins from the cyt...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1023/a:1022407705182
更新日期:1997-02-01 00:00:00
abstract::Transformation of 3T3 cells by SV40 virus changes the properties of the transplasma membrane electron transport activity which can be assayed by reduction of external ferric salts. After 42 h of culture and before the growth rate is maximum, the transformed cells have a much slower rate of ferric reduction. The change...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/BF00786008
更新日期:1991-12-01 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::2-Arachidonoylglicerol (2-AG) is an endocannabinoid that mimics the pharmacological effects of Δ⁹ tetrahydrocannabinol, the psychoactive component of the plant Cannabis sativa. It is present in many mammalian tissues, such as brain, liver, spleen, heart and kidney, where it exerts different biological effects either r...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-012-9431-6
更新日期:2012-04-01 00:00:00
abstract::By manipulating the physical properties of oxygen, cells are able to harvest the large thermodynamic potential of oxidation to provide a substantial fraction of the energy necessary for cellular processes. The enzyme largely responsible for this oxygen manipulation is cytochrome c oxidase, which resides at the inner m...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/s10863-007-9084-z
更新日期:2007-06-01 00:00:00
abstract::The organization of the oxidative phosphorylation (OXPHOS) system within the inner mitochondrial membrane appears to be far more complicated than previously thought. In particular, the individual protein complexes of the OXPHOS system (complexes I to V) were found to specifically interact forming defined supramolecula...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/s10863-008-9167-5
更新日期:2008-10-01 00:00:00
abstract::The midgut plasma membrane V-ATPase from larval Manduca sexta, the tobacco hornworm, is the sole energizer of any epithelial ion transport in this tissue and is responsible for the alkalinization of the gut lumen up to a pH of more than 11. This mini-review deals with those topics of research on this enzyme which may ...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1023/a:1005448614450
更新日期:1999-02-01 00:00:00
abstract::N- and P/Q-type calcium channels are localized in high density in presynaptic nerve terminals and are crucial elements in neuronal excitation-secretion coupling. In addition to mediating Ca2+ entry to initiate transmitter release, they are thought to interact directly with proteins of the synaptic vesicle docking/fusi...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1023/a:1021985521748
更新日期:1998-08-01 00:00:00
abstract::The mitochondrial inner membrane anion channel (IMAC) is a channel, identified by flux studies in intact mitochondria, which has a broad anion selectivity and is maintained closed or inactive by matrix Mg2+ and H+. We now present evidence that this channel, like many other chloride/anion channels, is reversibly blocke...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/BF02110652
更新日期:1996-04-01 00:00:00
abstract::The original version of this article unfortunately contained a mistake. The name of "Zohreh Noaparast" is now corrected in the author group of this article. ...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 已发布勘误
doi:10.1007/s10863-019-09803-w
更新日期:2019-08-01 00:00:00
abstract::Relevant Ca(2+) pools and fluxes in H9c2 cells have been studied using fluorescent indicators and Ca(2+)-mobilizing agents. Vasopressin produced a cytoplasmic Ca(2+) peak with half-maximal effective concentration of 6 nM, whereas thapsigargin-induced Ca(2+) increase showed half-maximal effect at 3 nM. Depolarization o...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-005-6635-z
更新日期:2005-08-01 00:00:00
abstract::Conformational changes within the subunit b-dimer of the E. coli ATP synthase occur upon binding to the F(1) sector. ESR spectra of spin-labeled b at room temperature indicated a pivotal point in the b-structure at residue 62. Spectra of frozen b +/- F(1) and calculated interspin distances suggested that where contact...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-008-9189-z
更新日期:2008-12-01 00:00:00
abstract::In this short review, we summarize our work on the role of members of the FXYD protein family as tissue-specific modulators of Na, K-ATPase. FXYD1 or phospholemman, mainly expressed in heart and skeletal muscle increases the apparent affinity for intracellular Na(+) of Na, K-ATPase and may thus be important for approp...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/s10863-005-9476-x
更新日期:2005-12-01 00:00:00
abstract::NYGGF4 (also called PID1) is a recently discovered gene that is involved in obesity-related insulin resistance (IR). We aimed in the present study to further elucidate the effects of NYGGF4 on IR and the underlying mechanisms through using metformin treatment in 3T3-L1 adipocytes. Our data showed that the metformin pr...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-012-9472-x
更新日期:2012-12-01 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::Soy isoflavones are diphenolic compounds that are frequently used for alternative treatment of ageing symptoms in both genders. They operate at principally two hierarchical levels of functional organization - cellular and molecular, while these 'types' of action appear to have indefinite borders. Soy isoflavone action...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/s10863-013-9536-6
更新日期:2014-04-01 00:00:00
abstract::Members of the genus Methanosarcina are strictly anaerobic archaea that derive their metabolic energy from the conversion of a restricted number of substrates to methane. H2 + CO2 are converted to CH4 via the CO2-reducing pathway, while methanol and methylamines are metabolized by the methylotrophic pathway. Two novel...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1023/b:jobb.0000019598.64642.97
更新日期:2004-02-01 00:00:00
abstract::Affinity labeling and genetic studies on the glycine-rich sequence of the beta subunit of E. coli F-type ATPase are discussed. A model of the structure of the enzyme near the gamma phosphate moiety is proposed. ...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/BF00762363
更新日期:1992-10-01 00:00:00
abstract::Cytochrome c oxidase was purified from mitochondria of Euglena gracilis and separated into 15 different polypeptide subunits by polyacrylamide gel electrophoresis. All 15 subunits copurify through various purification procedures, and the subunit composition of the isolated enzyme is identical to that of the immunoprec...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/BF00762727
更新日期:1989-06-01 00:00:00
abstract::Plasma membrane vesicles of HeLa cells are characterized by a drug-responsive oxidation of NADH. The NADH oxidation takes place in an argon or nitrogen atmosphere and in samples purged of oxygen. Direct assay of protein thiols by reaction with 5,5'-dithiobis-(2-nitrobenzoic acid) (DTNB; Ellman's reagent), suggests tha...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1023/a:1020594214379
更新日期:1998-10-01 00:00:00
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 ...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-012-9433-4
更新日期:2012-06-01 00:00:00
abstract::Evidence suggests membrane bound F(1)F(0)-ATPase complexes form stable associations such that dimers can be retrieved from detergent lysates of mitochondria isolated from a range of sources including algae, higher plants, yeast and bovine heart, and plant chloroplasts. The physiological relevance of these interactions...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1007/s10863-005-4128-8
更新日期:2005-04-01 00:00:00
abstract::ATP binding cassette (ABC) transporters comprise an extended protein family involved in the transport of a broad spectrum of solutes across membranes. They consist of a common architecture including two ATP-binding domains converting chemical energy into conformational changes and two transmembrane domains facilitatin...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/s10863-007-9120-z
更新日期:2007-12-01 00:00:00
abstract::The soxL gene from Sulfolobus acidocaldarius (DSM 639) encodes a Rieske iron-sulfur protein. In this study we report the identification of two open reading frames in its downstream region. The first one, named soxN, codes for a membrane protein bearing a resemblance to the b-type cytochromes of the cytochrome bc1 and ...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章
doi:10.1023/a:1023742002493
更新日期:2003-04-01 00:00:00
abstract::Vacuolar H+ ATPases participate in renal hydrogen ion secretion in both the proximal and distal nephron. These plasma membrane forms of the vacuolar H+ ATPase are regulated physiologically to maintain the acid-base balance of the organism. Proton transporting renal cells have requirements for constitutive acidificatio...
journal_title:Journal of bioenergetics and biomembranes
pub_type: 杂志文章,评审
doi:10.1007/BF00762528
更新日期:1992-08-01 00:00:00