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Franco AR, Cárdenas J, Fernández E. Two different carriers transport both ammonium and methylammonium in Chlamydomonas reinhardtii. J Biol Chem 1988; 263:14039-43. [PMID: 3170537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
A new methylammonium-resistant mutant strain from Chlamydomonas reinhardtii, henceforth termed 2172 (ma-2), has been isolated. This mutant is affected in a single mendelian gene different from and linked to the ma-1 locus which is defective in the methylammonium-resistant mutant 2170. Both mutations in ma-1 (2170) and ma-2 (2172) are linked to the nit-1 gene coding for the nitrate reductase apoenzyme. Mutant 2172 is affected in methylammonium but not in ammonium uptake capacity and shows derepressed nitrate and nitrite reductase activities in media containing nitrate plus methylammonium but not in nitrate plus ammonium media. The following two enzymatic components for the transport of both ammonium and methylammonium in wild-type cells have been identified: component 1, with high Vmax and K values, which is constitutive, and component 2, with low Vmax and K values, which is ammonium-repressible. Mutant 2170 lacks component 1 whereas mutant 2172 lacks component 2 for both methylammonium and ammonium transport. From genetic and kinetic evidences we conclude that in C. reinhardtii two different carriers are responsible for the transport of both ammonium and methylammonium and that methylammonium (ammonium) transport is a reversible process probably inhibited by the intracellular ammonium which, in turn, regulates nitrate and nitrite reductase levels.
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Franco AR, Cárdenas J, Fernández E. Two different carriers transport both ammonium and methylammonium in Chlamydomonas reinhardtii. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)68181-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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53
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Pineda M, Cabello P, Cárdenas J. Ammonium regulation of urate uptake in Chlamydomonas reinhardtii. PLANTA 1987; 171:496-500. [PMID: 24225711 DOI: 10.1007/bf00392297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/1986] [Accepted: 03/13/1987] [Indexed: 06/02/2023]
Abstract
Urate was taken up at a negligible rate by Chlamydomonas reinhardtii cells grown on ammonium and transferred to media containing urate plus ammonium or urate plus chloral hydrate or cycloheximide. Addition of ammonium to cells actively consuming urate produced a rapid inhibition of urate uptake whereas the intracellular oxidation of urate was unaffected. Methylammonium but not glutamine or glutamate inhibited urate uptake. Addition of L-methionine-DL-sulfoximine to cells actively consuming urate provoked ammonium excretion, which was accompanied by a rapid inhibition of urate uptake. In cells growing on urate and exhibiting noticeable levels of nitrite-reductase activity, nitrite caused a sudden inhibition of urate uptake whereas nitrate required a time to induce nitrate reductase and to exert its inhibitory effect on uptake. The urate-uptake system did not require urate for induction since the urate-uptake capacity appeared in nitrogen-starved cells. From these results it is concluded that, in Chlamydomonas reinhardtii, ammonium inhibits urate uptake and also acts as co-repressor of the uptake system.
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54
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Franco AR, Cárdenas J, Fernández E. Involvement of Reversible Inactivation in the Regulation of Nitrate Reductase Enzyme Levels in Chlamydomonas reinhardtii. PLANT PHYSIOLOGY 1987; 84:665-9. [PMID: 16665499 PMCID: PMC1056647 DOI: 10.1104/pp.84.3.665] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
All nitrate reductase-related activities of Chlamydomonas reinhardtii wild-type and mutant 305 cells were degraded in vivo under conditions in which the reversible inactivation could take place. When the enzyme was in the inactive form, half-lives of all nitrate reductase-related activities in wild and mutant 305 strains decreased significantly. The only nitrate reductase-related activity present in mutant 104, nitrate reductase-diaphorase, was incapable of undergoing reversible inactivation and was not degraded under any of the conditions tested. Addition of nitrate to inactive nitrate reductase of mutant 305 caused the in vivo reactivation of the enzyme and halted its degradation. Our results indicate that reversibly inactivated nitrate reductase from C. reinhardtii is the main target for a degradation system, and that nitrate reductase related diaphorase must be integrated in a reversibly inactive nitrate reductase complex to undergo degradation. A physiological role for the interconversion process of nitrate reductase can be understood on the basis of these facts.
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Córdoba F, Cárdenas J, Fernández E. Kinetic Characterization of Nitrite Uptake and Reduction by Chlamydomonas reinhardtii. PLANT PHYSIOLOGY 1986; 82:904-8. [PMID: 16665164 PMCID: PMC1056231 DOI: 10.1104/pp.82.4.904] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Kinetics of nitrite uptake and reduction by Chlamydomonas reinhardtii cells growing phototrophically has been studied by means of progress curves and the Michaelis-Menten integrated equation. Both uptake and reduction processes exhibited hyperbolic saturation kinetics, the nitrite uptake system lacking a diffusion component. Nitrite uptake and reduction showed significant differences in K(s) for nitrite at pH 7.5 (1.6 versus 20 micromolar, respectively), optimal pH, activation energy values, and sensitivity toward reagents of sulfhydryl groups. K(s) values for nitrite uptake were halved in cells subjected to darkness or to nitrogen-starvation. Nitrate inhibited nitrite uptake by a partially competitive mechanism. The same inhibition pattern was found for nitrite uptake by C. reinhardtii mutant 305 cells incapable of nitrate assimilation. The results demonstrate that C. reinhardtii cells take up nitrite via a highly specific carrier, probably energy-dependent, kinetically responsive to environmental changes, distinguishable from the enzymic nitrite reduction and endowed with an active site for nitrite not usable for nitrate transport.
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Muñoz-Blanco J, Cárdenas J. Determination of urease activity by thermal conductivity gas chromatography. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1986; 13:77-84. [PMID: 3772025 DOI: 10.1016/0165-022x(86)90019-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A rapid, simple and inexpensive procedure for the determination of urease activity by using a thermal conductivity gas chromatography method is presented. The procedure is based on the determination of CO2 released in the urease reaction, and showed low coefficient of variation (c.v. less than 1%) and high sensitivity (detection limit 10(-12) mol). This procedure is also suitable for determination of other decarboxylating enzyme activities.
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Souza y Machorro M, Mestas J, Turull F, Cárdenas J. [Health service management of alcoholism. Codified psychiatric clinical history]. SALUD PUBLICA DE MEXICO 1985; 27:291-307. [PMID: 4071279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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58
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Caballero FJ, Cejudo FJ, Florencio FJ, Cárdenas J, Castillo F. Molecular and regulatory properties of glutamine synthetase from the phototrophic bacterium Rhodopseudomonas capsulata E1F1. J Bacteriol 1985; 162:804-9. [PMID: 2859272 PMCID: PMC218924 DOI: 10.1128/jb.162.2.804-809.1985] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The glutamine synthetase of the phototrophic bacterium Rhodopseudomonas capsulata E1F1 was purified to homogeneity by a procedure which used a single affinity chromatography step. Like enzymes from other photosynthetic procaryotes, native glutamine synthetase from R. capsulata E1F1 was found to be a dodecameric protein of approximately 660 kilodaltons with identical subunits of about 55 kilodaltons each. The Stokes radius and S20,w of the native enzyme were 8.35 nm and 19.20, respectively. The enzyme exhibited different aggregation states with detectable oligomers of 1, 2, 3, 4, 6, 8, 10, and 12 subunits. Disaggregation of the glutamine synthetase occurred after the native protein was subjected to electrophoresis in polyacrylamide gels, as well as occurring spontaneously at low ionic strength. Glutamine synthetase from R. capsulata E1F1 was regulated by an adenylylation-deadenylylation mechanism, and the adenylylation state of the protein depended on the nitrogen source, growth phase, and light intensity. Ammonia repressed glutamine synthetase, whereas glycine, serine, alanine, valine, and aspartate were noncompetitive inhibitors of the glutamine synthetase biosynthetic activity.
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59
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Franco AR, Cárdenas J, Fernández E. Heteromultimeric structure of the nitrate reductase complex of Chlamydomonas reinhardii. EMBO J 1984; 3:1403-7. [PMID: 16453530 PMCID: PMC557530 DOI: 10.1002/j.1460-2075.1984.tb01984.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The NAD(P)H-nitrate reductase complex (overall-NR) of Chlamydomonas reinhardii exhibits two partial activities: NAD(P)H-cytochrome c reductase (diaphorase) and reduced benzyl viologen-NR (terminal-NR). Mild tryptic digestion of the enzyme complex resulted in the loss of both overall and terminal-NR activities, whereas diaphorase activity remained unaltered. The diaphorase activity of mutant 104 and the terminal-NR activity of mutant 305 of C. reinhardii, which are the sole activities related to NR present in these mutants, responded to tryptic treatment to the same extent as the corresponding activities of the wild enzyme complex. Trypsin disassembled the 220-kd NR native complex by destroying the aggregation capability of the diaphorase subunits without affecting their activity nor molecular size (45 kd). A 67-kd thermostable protein, containing molybdenum co-factor, was also released from trypsin-treated NR. This protein lacked diaphorase and NR activities but was able to reconstitute the overall-NR complex by complementation with untreated diaphorase subunit of mutant 104. Our results support a tetrameric structure for the C. reinhardii NR complex, containing two kinds of subunits.
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60
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Moreno-Vivián C, Castillo F, Cárdenas J. Effect of light and darkness on nitrate assimilation by Rhodopseudomonas capsulata E1F1. PHOTOSYNTHESIS RESEARCH 1982; 3:313-319. [PMID: 24458344 DOI: 10.1007/bf00034112] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/1982] [Revised: 05/15/1982] [Indexed: 06/03/2023]
Abstract
The photosynthetic nonsulfur purple bacterium Rhodopseudomonas capsulata strain E1F1 assimilated nitrate or nitrite only in illuminated cultures under anaerobic conditions. The bacterial cells grew aerobically in the dark only when ammonia or other forms of reduced nitrogen were present in the medium. However, nitrate reductase was detected either in light-anaerobic or in dark-aerobic conditions upon addition of nitrate to the media. Changes from light-anaerobic to dark-aerobic conditions and vice versa markedly influenced growth, nitrate uptake and the nitrate reductase levels. Growth on nitrate in the light and nitrate reductase activity were dependent on the presence of molybdenum in the medium whereas the addition of tungstate inhibited both growth and enzyme activity.
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Fernández E, Cárdenas J. Regulation of the nitrate-reducing system enzymes in wild-type and mutant strains of Chlamydomonas reinhardii. MOLECULAR & GENERAL GENETICS : MGG 1982; 186:164-9. [PMID: 6810063 DOI: 10.1007/bf00331846] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Six mutant strains (301, 102, 203, 104, 305, and 307) affected in their nitrate assimilation capability and their corresponding parental wild-type strains (6145c and 21gr) from Chlamydomonas reinhardii have been studied on different nitrogen sources with respect to NAD(P)H-nitrate reductase and its associated activities (NAD(P)H-cytochrome c reductase and reduced benzyl viologen-nitrate reductase) and to nitrite reductase activity. The mutant strains lack NAD(P)H-nitrate reductase activity in all the nitrogen sources. Mutants 301, 102, 104, and 307 have only NAD(P)H-cytochrome c reductase activity whereas mutant 305 solely has reduced benzyl viologen-nitrate reductase activity. Both activities are repressible by ammonia but, in contrast to the nitrate reductase complex of wild-type strains, require neither nitrate nor nitrite for their induction. Moreover, the enzyme from mutant 305 is always obtained in active form whereas nitrate reductase from wild-types needs to be reactivated previously with ferricyanide to be fully detected. Wild-type strains and mutants 301, 102, 104, and 307, when properly induced, exhibit an NAD(P)H-cytochrome c reductase distinguishable electrophoretically from constitutive diaphorases as a rapidly migrating band. Nitrite reductase from wild-type and mutant strains is also repressible by ammonia and does not require nitrate or nitrite for its synthesis. These facts are explained in terms of a regulation of nitrate reductase synthesis by the enzyme itself.
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Castillo F, Cárdenas J. Nitrate reduction by photosynthetic purple bacteria. PHOTOSYNTHESIS RESEARCH 1982; 3:3-18. [PMID: 24459017 DOI: 10.1007/bf00030045] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/1982] [Revised: 02/25/1982] [Indexed: 06/03/2023]
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63
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Fernández E, Cárdenas J. Occurrence of xanthine dehydrogenase in Chlamydomonas reinhardii: A common cofactor shared by xanthine dehydrogenase and nitrate reductase. PLANTA 1981; 153:254-257. [PMID: 24276829 DOI: 10.1007/bf00383895] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/1981] [Accepted: 07/06/1981] [Indexed: 06/02/2023]
Abstract
Wild-type Chlamydomonas reinhardii cells have xanthine dehydrogenase activity when grown with nitrate, nitrite, urea, or amino acid media. Mutant strains 102, 104, and 307 of Chlamydomonas, lacking both xanthine dehydrogenase and nitrate reductase activities, were incapable of restoring the NADPH-nitrate reductase activity of the mutant nit-1 of Neurospora crassa, whereas wild type cells and mutants 203 and 305 had xanthine dehydrogenase and were able to reconstitute the nitrate reductase activity of nit-1 of Neurospora. Therefore, it is concluded that in Chlamydomonas a common cofactor is shared by xanthine dehydrogenase and nitrate reductase. Xanthine dehydrogenase is repressed by ammonia and seems to be inessential for growth of Chlamydomonas.
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64
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Fernández E, Cárdenas J. In vitro complementation of assimilatory NAD(P)H-nitrate reductase from mutants of Chlamydomonas reinhardii. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 657:1-12. [PMID: 6452169 DOI: 10.1016/0005-2744(81)90125-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
In vitro complementation of the soluble assimilatory NAD(P)H-nitrate reductase (NAD(P)H:nitrate oxidoreductase, EC 1.6.6.2) was attained by mixing cell-free preparations of Chlamydomonas reinhardii mutant 104, uniquely possessing nitrate-inducible NAD(P)H-cytochrome c reductase, and mutant 305 which possesses solely the nitrate-inducible FMNH2- and reduced benzyl viologen-nitrate reductase activities. Full activity and integrity of NAD(P)H-cytochrome c reductase from mutant 104 and reduced benzyl viologen-nitrate reductase from mutant 305 are needed for the complementation to take place. A constitutive and heat-labile molybdenum-containing cofactor, that reconstitutes the NAD(P)H-nitrate reductase activity of nit-1 Neurospora crassa but is incapable of complementing with 104 from C. reinhardii, is present in the wild type and 305 algal strains. The complemented NAD(P)H-nitrate reductase has been purified 100-fold and was found to be similar to the wild enzyme in sucrose density sedimentation, molecular size, pH optimum, kinetic parameters, substrate affinity and sensitivity to inhibitors and temperature. From previous data and data presented in this article on 104 and 305 mutant activities, it is concluded that C. reinhardii NAD(P)H-nitrate reductase is a heteromultimeric complex consisting of, at least, two types of subunits separately responsible for the NAD(P)H-cytochrome c reductase and the reduced benzyl viologen-nitrate reductase activities.
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65
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Villalobo A, Picorell R, Cárdenas J. NADH and NADPH-viologen reductases from Acinetobacter calcoaceticus. REVISTA ESPANOLA DE FISIOLOGIA 1979; 35:89-95. [PMID: 223203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Three pyridine nucleotide-dependent diaphorases have been isolated from Acinetobacter calcoaceticus cells and partially characterized. Two of them, with molecular weights of 165,000 and 57,000, utilize NADPH as electron donor whereas the third one (MW = 57,000) is specific for NADH. Oxidized viologen dyes, flavin nucleotides, dichlorophenol indophenol and ferricyanide can act with efficiency as acceptors in the reaction mediated by these diaphorases. The diaphorase activities have been characterized kinetically, and the effect of different inhibitors and cofactors has been also studied. The diaphorases seem to be subjected to metabolic control by oxidation and reduction.
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66
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Cárdenas J, Bermúdez RH, Ramírez-Ronda CH. [Guillain-Barré syndrome: Past, present and future]. BOLETIN DE LA ASOCIACION MEDICA DE PUERTO RICO 1978; 70:116-20. [PMID: 350235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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67
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Ortega T, Rivas J, Cárdenas J, Losada M. Metabolic interconversion of ferredoxin-nitrate reductase and NADP reductase of Nostoc muscorum. Biochem Biophys Res Commun 1977; 78:185-93. [PMID: 410410 DOI: 10.1016/0006-291x(77)91238-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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68
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Ortega T, Castillo F, Cárdenas J, Losada M. Inactivation by ammonia of the photosynthetic reduction of nitrate in Nostoc muscorum particles. Biochem Biophys Res Commun 1977; 75:823-31. [PMID: 405010 DOI: 10.1016/0006-291x(77)91456-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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69
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Ortega T, Castillo F, Cárdenas J. Photolysis of water coupled to nitrate reduction by Nostoc muscorum subcellular particles. Biochem Biophys Res Commun 1976; 71:885-91. [PMID: 9086 DOI: 10.1016/0006-291x(76)90914-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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70
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Cárdenas J, Mortenson LE, Yoch DC. Purification and properties of paramagnetic protein from Clostridium pasteurianum W5. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 434:244-57. [PMID: 181066 DOI: 10.1016/0005-2795(76)90056-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The purification to homogeneity of the non-heme iron protein, sometimes referred to as either "red protein" or "paramagnetic protein", from Clostridium pasteurianum W5 extracts is described and its physicochemical properties studied. This paramagnetic protein (g= 1.94) has a molecular weight of about 25000 and contains two iron and two acid-labile sulfur atoms per mol of protein. Its midpoint potential at pH 7.5, as determined by electron paramagnetic resonance titration, is -300 mV. Optical circular dichroism and electron paramagnetic resonance spectra of the paramagnetic protein are similar to those of two iron-two acid-labile sulfur ferredoxins. The biochemical reduction of the purified protein was also studied.
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Cárdenas J, Resnikoff S, Verdura J. [Syndrome of the spinal duct due to narrowing of the lumbar region in patients of advanced age. Surgical treatment]. GAC MED MEX 1975; 110:421-7. [PMID: 1205093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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72
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Abstract
In Chlamydomonas reinhardii the reduction of nitrate to ammonia occurs in two independent enzymatic steps: 1. the two-electrons reduction of nitrate to nitrite catalyzed by NADH-nitrate reductase, and, 2. the six-electrons reduction of nitrite to ammonia catalyzed by ferredoxin-nitrite reductase. Both enzymes have been purified and characterized, and some of their properties have been studied.
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73
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Resnikoff S, Verdura J, Cárdenas J. Multiple intraspinal meningiomas at different levels, operated on with a seven-year interval: a case report. Ann Surg 1972; 176:798-800. [PMID: 4654133 PMCID: PMC1355488 DOI: 10.1097/00000658-197212000-00024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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74
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Verdura J, Resnikoff S, Cárdenas J, De Avila A, Rosenthal J. Complete recovery after resuscitation and emergency craniotomy in three children with acute epidural haematoma. Resuscitation 1972; 1:201-4. [PMID: 4653747 DOI: 10.1016/0300-9572(72)90049-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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75
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Cárdenas J, Barea JL, Rivas J, Moreno CG. Purification and properties of nitrite reductase from spinach leaves. FEBS Lett 1972; 23:131-5. [PMID: 4404491 DOI: 10.1016/0014-5793(72)80322-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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76
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Cárdenas J, Rivas J, Paneque A, Losada M. Effect of iron supply on the activities of the nitrate-reducing system from Chlorella. ARCHIV FUR MIKROBIOLOGIE 1972; 81:260-3. [PMID: 5012156 DOI: 10.1007/bf00412244] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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77
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Losada M, Paneque A, Aparicio PJ, Vega JM, Cárdenas J, Herrera J. Inactivation and repression by ammonium of the nitrate reducing system in chlorella. Biochem Biophys Res Commun 1970; 38:1009-15. [PMID: 4314387 DOI: 10.1016/0006-291x(70)90340-2] [Citation(s) in RCA: 132] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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78
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Alvarez de los Cobos J, Jurado-García E, Sagaón J, León E, Cárdenas J. [Nutrition of premature infants. Use of acidified milk]. BOLETIN MEDICO DEL HOSPITAL INFANTIL DE MEXICO 1965; 22:537-50. [PMID: 5898658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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