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Lieutaud C, Nitschke W, Verméglio A, Parot P, Schoepp-Cothenet B. HiPIP in Rubrivivax gelatinosus is firmly associated to the membrane in a conformation efficient for electron transfer towards the photosynthetic reaction centre. BIOCHIMICA ET BIOPHYSICA ACTA 2003; 1557:83-90. [PMID: 12615351 DOI: 10.1016/s0005-2728(02)00397-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
High potential iron-sulfur protein (HiPIP), a small soluble redox protein, has been shown to serve in vivo as electron donor to the photosynthetic reaction centre (RC) in Rubrivivax gelatinosus [Biochemistry 34 (1995) 11736]. The results of time-resolved optical spectroscopy on membrane-fragments from this organism indicates that the photooxidized RC is re-reduced by HiPIP even in the absence of the soluble fraction. This implies that a significant fraction of HiPIP can firmly bind to the membrane in a conformation able to interact with the RCs. Salt treatment of the membrane-fragments abolishes these re-reduction kinetics, demonstrating the presence of HiPIP on the membrane due to association with the RC rather than due to simple trapping in hypothetical chromatophores. The existence of such a functional complex in membranes is confirmed and its structure further examined by electron paramagnetic resonance (EPR) performed on membrane-fragments. Orientation-dependent EPR spectra of HiPIP were recorded on partially ordered membranes, oxidized either chemically or photochemically. Whereas hardly any preferential orientation of the HiPIP was seen in the chemically oxidised sample, a subpopulation of HiPIP showing specific orientations could be photooxidised. This fraction arises from the electron transfer complex between HiPIP and the RC.
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Affiliation(s)
- Clément Lieutaud
- Laboratoire de Biophysique des Transporteurs d'Electrons, Faculté des Sciences de Luminy, 136 Avenue de Luminy, 13288 Marseille Cedex 9, France
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2
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Nagashima KVP, Matsuura K, Shimada K, Verméglio A. High-potential iron-sulfur protein (HiPIP) is the major electron donor to the reaction center complex in photosynthetically growing cells of the purple bacterium Rubrivivax gelatinosus. Biochemistry 2002; 41:14028-32. [PMID: 12437360 DOI: 10.1021/bi026511a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A gene encoding the high-potential iron-sulfur protein (HiPIP) was cloned from the purple photosynthetic bacterium Rubrivivax gelatinosus. An insertional disruption of this gene by a kanamycin resistance cartridge resulted in a significant decrease in the growth rate under photosynthetic growth conditions. Flash-induced kinetic measurements showed that the rate of reduction of the photooxidized reaction center is greatly diminished in the mutant depleted in the HiPIP. On the other hand, mutants depleted in the low- and high-potential cytochromes c(8), the two other soluble electron carriers, which have been shown to donate an electron to the reaction center in Rvi. gelatinosus, showed growth rates similar to those of the wild type under both photosynthetic and respiratory growth conditions. It was concluded that HiPIP is the major physiological electron donor to the reaction center in Rvi. gelatinosus cells grown under photosynthetic conditions.
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Affiliation(s)
- Kenji V P Nagashima
- Department of Biology, Tokyo Metropolitan University, Minamiohsawa 1-1, Hachioji, Tokyo 192-0397, Japan.
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3
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Menin L, Yoshida M, Jaquinod M, Nagashima KV, Matsuura K, Parot P, Verméglio A. Dark aerobic growth conditions induce the synthesis of a high midpoint potential cytochrome c8 in the photosynthetic bacterium Rubrivivax gelatinosus. Biochemistry 1999; 38:15238-44. [PMID: 10563807 DOI: 10.1021/bi991146h] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In several strains of the photosynthetic bacterium Rubrivivax gelatinosus, the synthesis of a high midpoint potential cytochrome is enhanced 4-6-fold in dark aerobically grown cells compared with anaerobic photosynthetic growth. This observation explains the conflicting reports in the literature concerning the cytochrome c content for this species. This cytochrome was isolated and characterized in detail from Rubrivivax gelatinosus strain IL144. The redox midpoint potential of this cytochrome is +300 mV at pH 7. Its molecular mass, 9470 kDa, and its amino acid sequence, deduced from gene sequencing, support its placement in the cytochrome c8 family. The ratio of this cytochrome to reaction center lies between 0.8 and 1 for cells of Rvi. gelatinosus grown under dark aerobic conditions. Analysis of light-induced absorption changes shows that this high-potential cytochrome c8 can act in vivo as efficient electron donor to the photooxidized high-potential heme of the Rvi. gelatinosus reaction center.
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Affiliation(s)
- L Menin
- C.E.A./Cadarache-DSV-DEVM-Laboratoire de Bioénergétique Cellulaire, Saint-Paul-lez-Durance, France
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4
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Ambler RP, Daniel M, Meyer TE, Cusanovich MA. Amino acid sequences of two high-potential iron-sulfur proteins (HiPIPs) from the moderately halophilic purple phototrophic bacterium, Rhodospirillum salinarum. Arch Biochem Biophys 1999; 369:143-8. [PMID: 10462450 DOI: 10.1006/abbi.1999.1323] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The amino acid sequences of two very different high-potential iron-sulfur protein (HiPIP) isozymes have been determined from the moderately halophilic purple phototrophic bacterium, Rhodospirillum salinarum. Iso-1 HiPIP, which is monomeric and contains 57 amino acid residues, is most similar to the Thiobacillus ferrooxidans iron-oxidizing enzyme (45% identity and a 6-residue deletion). On the other hand, iso-2 HiPIP, which is isolated as an oligomer, contains a peptide chain with 54 amino acid residues. It is the smallest reported to date and is only 31% identical to iso-1 HiPIP. A massive deletion of 17 residues is found at the N-terminus, such that only 2 residues remain prior to the first cysteine. Iso-2 HiPIP also has a 12-residue insertion and a 5-residue deletion. Prior to this study, there were only 2 absolutely conserved residues (Tyr 19 and Gly 75, Chromatium numbering) in addition to the 4 iron-sulfur cluster binding cysteine residues among the 13 HiPIPs sequenced to date. We found that Tyr 19 is absent in iso-2 HiPIP along with the entire N-terminal loop. Moreover, Gly 75 is substituted in both R. salinarum HiPIPs. These characteristics make the R. salinarum HiPIPs, and especially iso-2, the most divergent yet characterized.
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Affiliation(s)
- R P Ambler
- Institute of Cell and Molecular Biology, University of Edinburgh, Edinburgh, EH9 3JR, Scotland.
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5
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Schoepp B, Brugna M, Lebrun E, Nitschke W. Iron-Sulfur Centers Involved in Photosynthetic Light Reactions. ADVANCES IN INORGANIC CHEMISTRY 1999. [DOI: 10.1016/s0898-8838(08)60082-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Sticht H, Rösch P. The structure of iron-sulfur proteins. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 1998; 70:95-136. [PMID: 9785959 DOI: 10.1016/s0079-6107(98)00027-3] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Ferredoxins are a group of iron-sulfur proteins for which a wealth of structural and mutational data have recently become available. Previously unknown structures of ferredoxins which are adapted to halophilic, acidophilic or hyperthermophilic environments and new cysteine patterns for cluster ligation and non-cysteine cluster ligation have been described. Site-directed mutagenesis experiments have given insight into factors that influence the geometry, stability, redox potential, electronic properties and electron-transfer reactivity of iron-sulfur clusters.
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Affiliation(s)
- H Sticht
- Lehrstuhl für Struktur und Chemie der Biopolymere, Universität Bayreuth, Germany.
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7
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Benini S, Ciurli S, Rypniewski WR, Wilson KS. Crystals of cytochrome c-553 fromBacillus pasteurii show diffraction to 0.97 å resolution. Proteins 1997. [DOI: 10.1002/(sici)1097-0134(199708)28:4<580::aid-prot11>3.0.co;2-c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Osyczka A, Yoshida M, Nagashima KV, Shimada K, Matsuura K. Electron transfer from high-potential iron-sulfur protein and low-potential cytochrome c-551 to the primary donor of Rubrivivax gelatinosus reaction center mutationally devoid of the bound cytochrome subunit. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1997. [DOI: 10.1016/s0005-2728(97)00041-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Van Driessche G, Ciurli S, Hochkoeppler A, Van Beeumen JJ. The primary structure of Rhodoferax fermentans high-potential iron-sulfur protein, an electron donor to the photosynthetic reaction center. EUROPEAN JOURNAL OF BIOCHEMISTRY 1997; 244:371-7. [PMID: 9119002 DOI: 10.1111/j.1432-1033.1997.00371.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The complete amino acid sequence of Rhodoferax fermentans high-potential iron-sulfur protein (Hipip), which is known to be an efficient electron donor to the photosynthetic reaction center, has been determined using both N-terminal and C-terminal analyses. The sequence contains 75 residues, with 11 positive charges, 10 negative charges, and one histidine residue. The molecular mass of apo-Hipip, determined by electrospray ionization mass spectrometry, is 7849.64 Da. Multiple sequence alignment, based both on primary and tertiary structure information, reveals conservation of Tyr19 and Gly75 (Chromatium vinosum numbering) in addition to the four [Fe4S4]-bound cysteines. The Hipip from Rf. fermentans is most similar (57% similarity) to the Hipip from Rubrivivax gelatinosus, a photosynthetic bacterium belonging to the beta-1 subgroup of the proteobacteria.
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Affiliation(s)
- G Van Driessche
- Department of Biochemistry, Physiology and Microbiology, University of Gent, Belgium
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10
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Ciurli S, Cremonini MA, Kofod P, Luchinat C. 1H NMR of high-potential iron-sulfur protein from the purple non-sulfurbacterium Rhodoferax fermentans. EUROPEAN JOURNAL OF BIOCHEMISTRY 1996; 236:405-11. [PMID: 8612609 DOI: 10.1111/j.1432-1033.1996.00405.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Oxidized and reduced forms of high-potential iron-sulfur protein (HiPIP) from the purple non-sulfur photosynthetic bacterium Rhodoferax fermentans have been characterized using 1H-NMR spectroscopy. Pairwise and sequence-specific assignments of hyperfine-shifted 1H-NMR signals to protons of cysteine residues bound to the [4Fe-4S]3+/2+ cluster have been performed using one-dimensional NOE and exchange spectroscopy experiments. 1H-NMR hyperfine shifts and relaxation rates of cluster-bound Cys beta-CH2 protons indicate that in the [4Fe-4S]3+ cluster one iron ion can be formally described as Fe(III), while electron density corresponding to one electron is unevenly delocalized onto the remaining three iron ions. This delocalization is effected by means of two different electronic distributions interconverting rapidly on the NMR time scale. The mechanism of paramagnetic proton relaxation, studied by analyzing longitudinal relaxation rates of Cys beta-CH2 protons in HiPIPs from six different sources as a function of the Fe-S-C beta-C alpha dihedral angle, indicate that the major contribution is due to a dipolar metal-centered mechanism, with a non-negligible contribution from a ligand-centered dipolar mechanism which involves the 3p orbital of the Cys sulfur atom. A semi-quantitative tool for extracting structural information from relaxation time measurements is proposed.
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Affiliation(s)
- S Ciurli
- Institute of Agricultural Chemistry, University of Bologna, Italy
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11
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Bertini I, Eltis LD, Felli IC, Kastrau DHW, Luchinat C, Piccioli M. The Solution Structure of Oxidized HiPIP I fromEctothiorhodospira halophila; Can NMR Spectroscopy Be Used to Probe Rearrangements Associated with Electron Transfer Processes? Chemistry 1995. [DOI: 10.1002/chem.19950010906] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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12
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Heering HA, Bulsink YB, Hagen WR, Meyer TE. Reversible super-reduction of the cubane [4Fe-4S](3+;2+;1+) in the high-potential iron-sulfur protein under non-denaturing conditions. EPR spectroscopic and electrochemical studies. EUROPEAN JOURNAL OF BIOCHEMISTRY 1995; 232:811-817. [PMID: 7588720 DOI: 10.1111/j.1432-1033.1995.0811a.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The reversible 2 x 1 e- reduction of the cubane cluster from oxidized to reduced to super-reduced states ([4Fe-4S]3+<-->[4Fe-4S]2+<-->[4Fe-4S]1+) was studied in high-potential iron-sulfur proteins (HiPIPs). Super-reduction to the 1+ state was not observed in any of the seven HiPIPs tested during cyclic voltammetry (down to -0.95 V). However, equilibration at low potential (pH 7.5) of Rhodopila globiformis HiPIP yields a transient peak around -0.47 V due to the oxidation of super-reduced HiPIP adsorbed at the electrode. The peak area depends on the equilibration potential according to a one-electron Nernst curve with a half-wave potential at -0.91 V. Reduction of R. globiformis HiPIP with titanium (III)citrate at pH 9.5 is very slow [pseudo-first-order half-life of 23 min with a 100-fold excess Ti(III)] but is reversible, and the EPR spectrum with g values of 2.04 and 1.92 is similar to that of reduced [4Fe-4S]1+ ferredoxins. Chemical or electrochemical reoxidation of the super-reduced form resulted in an EPR spectrum with g parallel = 2.12 and g perpendicular = 2.03, i.e. identical to that of oxidized HiPIP. From the equilibrium concentration of super-reduced HiPIP at a low concentration of Ti(III), a reduction potential of -0.64 V can be estimated. Super-reduction of the large HiPIP (iso-2) from Rhodospirillum salinarum is also possible with Ti(III)(gz = 2.05) but the super-reduced state is unstable. No super-reduction with Ti(III) was observed for the other HiPIPs. The difference between the electrochemically observed reduction potential and oxidation potential is explained by a fast and reversible conformational change upon super-reduction. The rate of super-reduction with Ti(III) is limited by the small amount (0.1%) of HiPIP in the 2+ state with the super-reduced conformation.
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Affiliation(s)
- H A Heering
- Department of Biochemistry, Wageningen Agricultural University, The Netherlands
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13
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Heering HA, Bulsink YBM, Hagen WR, Meyer TE. Reversible Super-Reduction of the Cubane [4Fe-4S](3+;2+;1+) in the High-Potential Iron-Sulfur Protein Under Non-Denaturing Conditions. EPR Spectroscopic and Electrochemical Studies. ACTA ACUST UNITED AC 1995. [DOI: 10.1111/j.1432-1033.1995.tb20877.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Matsubara H, Saeki K. Structural and Functional Diversity of Ferredoxins and Related Proteins. ADVANCES IN INORGANIC CHEMISTRY 1992. [DOI: 10.1016/s0898-8838(08)60065-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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Bartsch RG. The distribution of soluble metallo-redox proteins in purple phototrophic bacteria. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1058:28-30. [PMID: 2043646 DOI: 10.1016/s0005-2728(05)80262-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A comparison is made of types and distribution of cytochromes and certain ferredoxins (HiPIP) among photosynthetic bacteria. These are subdivided as to the type of reaction center each species is believed to contain. The proteins listed are assumed to be of periplasmic origin. Interrelationships suggested by the comparison are discussed.
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Affiliation(s)
- R G Bartsch
- Department of Biochemistry, University of Arizona, Tucson
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16
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Meyer TE, Cannac V, Fitch J, Bartsch RG, Tollin D, Tollin G, Cusanovich MA. Soluble cytochromes and ferredoxins from the marine purple phototrophic bacterium, Rhodopseudomonas marina. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1017:125-38. [PMID: 2161686 DOI: 10.1016/0005-2728(90)90143-r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Four soluble c-type cytochromes, the high redox potential 4-Fe-S ferredoxin known as HiPIP, a large molecular weight 2-Fe-S ferredoxin and a 4-Fe-S 'bacterial' ferredoxin, were isolated from extracts of two strains of Rps. marina. Cytochrome c-550, cytochrome c' and cytochrome c-549 were previously described, and we have extended their characterization. Cytochrome c-558, which has not previously been observed in Rps. marina, appears to be a low-spin isozyme of the more commonly observed high-spin cytochrome c'. HiPIP, which was not observed in previous work, was found to be abundant in Rps. marina. The 2-Fe-S ferredoxin, which has previously been observed only in Rps. palustris, has a native size greater than 100 kDa and a subunit size of 17 kDa. The 'bacterial' ferredoxin appears to have only a single four-iron-sulfur cluster. We examined photosynthetic membranes by difference spectroscopy and found abundant c-type cytochromes. Approximately one-quarter of the heme can be reduced by ascorbate and the remainder by dithionite. There is 2 nm difference between the high-potential heme (554 nm) and the low (552 nm). These characteristics resemble those of the tetraheme reaction center cytochrome of Rps. viridis. In addition to the electron transfer components, we found small amounts of a fluorescent yellow protein which has spectral resemblance to a photoactive yellow protein from Ec. halophila.
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Affiliation(s)
- T E Meyer
- Department of Biochemistry, University of Arizona, Tucson 85721
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17
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Tedro SM, Meyer TE, Kamen MD. Amino acid sequence of high-redox-potential ferredoxin (HiPIP) isozymes from the extremely halophilic purple phototrophic bacterium, Ectothiorhodospira halophila. Arch Biochem Biophys 1985; 241:656-64. [PMID: 4037807 DOI: 10.1016/0003-9861(85)90592-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The amino acid sequences of high-redox-potential ferredoxin (HiPIP) isozymes from Ectothiorhodospira halophila have been determined. These are: isozyme I, EPRAEDGHAHDYVNEAADPSHGRYQEGQLCENCAFWGEAVQDGWGRCTHPDFDEVLVKAEGWCSVYAPA S, and isozyme II, GLPDGVEDLPKAEDDHAHDYVNDAADTDHARFQEGQLCENCQFWVDYVNGWGYCQHPDFTDVLVRGEGW CSVYAPA. Isozyme II is the major form of HiPIP produced by the bacterium (65-80%) and is the most acidic of the known HiPIPs. The two isozymes are 72% identical to one another and require only a single residue deletion for alignment. Comparison of these HiPIPs with seven previously determined sequences revealed only 27% average identity. Both E. halophila HiPIP isozymes are likely to be functional since their sequences are equally distant from those of other species. The E. halophila HiPIP sequences show that H-bonding patterns recognized in Chromatium vinosum HiPIP are likely to be conserved and therefore cannot explain the unusually low redox potentials which have been reported.
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18
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Blum H, Bowyer JR, Cusanovich MA, Waring AJ, Ohnishi T. Spin-lattice relaxation rates of iron-sulfur proteins and heme proteins affected by dysprosium complexes and temperature. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0167-4838(83)90188-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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19
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Coutelle R, Hofacker GL. Influence of selective processes on the amino acid compositions of proteins: collagen, cytochrome c, ferredoxin and alpha-crystallin. J Theor Biol 1982; 95:615-39. [PMID: 6287116 DOI: 10.1016/0022-5193(82)90345-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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20
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Abstract
A recent and important approach to investigating electron transfer mechanisms of redox proteins has been through kinetic-ionic strength studies. There is, however, significant controversy as to whether such studies (1) yield information regarding the charge (or location) of the electron transfer site or (2) more simply reflect the influence of net or overall protein charge on the electrostatic interactions. A critical analysis using different theoretical approaches is made of our recent work and of the bulk of the published non-physiological small molecule-protein and protein-protein kinetic ionic strength studies; it is concluded that (1) the approximated Bronsted-Debye-Huckel equation can not be used at all for protein redox reactions, (2) irrespective of the theoretical approaches discussed, such studies do not provide information regarding the charge of the electron transfer site, (3) it is the net charge of the reactants that control the electrostatic interactions, (4) both the equation derived by Wherland and Gray and the full Bronsted-Debye-Huckel equation provide reasonably good approximations of net protein charge, (5) pH changes quantitatively modulate net protein charge, and (6) thus, protein redox rates need to be electrostatically corrected if relevant interpretations of kinetic-ionic strength experiments are to be made.
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21
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Hahm KS, Gawron O, Piszkiewicz D. Amino acid sequence of a peptide containing an essential cysteine residue of pig heart aconitase. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 667:457-61. [PMID: 7213810 DOI: 10.1016/0005-2795(81)90211-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Pig heart aconitase reacts with one mole of phenacyl bromide per molecule to give complete inactivation due to the alkylation of a cysteine reside at the active site. A tryptic peptide containing this essential residue has been isolated and its amino acid sequence determined at Ile-Gln-Leu-Leu-Cys *-Pro-Leu-Leu-Asn-Gln-Phe-Asp-Lys by manual methods and by the use of an automated solid phase sequencer. There is a limited similarity in amino acid sequence between this peptide and other peptides containing the cysteine residues involved in the binding of the iron-sulfur clusters of high-potential iron-sulfur protein of Rhodopseudomonas gelatinosa and rubredoxins from various bacteria.
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22
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Nettesheim DG, Johnson WV, Feinberg BA. The role of histidine-42 in the oxidation-reduction mechanism of Chromatium vinosum high potential iron-sulfur protein. BIOCHIMICA ET BIOPHYSICA ACTA 1980; 593:371-83. [PMID: 7236640 DOI: 10.1016/0005-2728(80)90074-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The second order rate constants for the oxidation of high potential iron-sulfur protein (Hipip) of Chromatium vinosum by ferricyanide were determined as a function of ionic strength and pH. From the ionic strength results, calculations were done to correct the rate constant at each pH for the electrostatic interactions between Hipip and ferricyanide. The electrostatic corrections are necessary since the charge of the protein changes as a function of pH and can mask the ionization of mechanistically important amino acid residues. An apparent pKa congruent to 7 was obtained from electrostatically corrected rate-pH profile, indicating the possible participation of histidine. Perturbation difference spectroscopic studies of Hipip as a function of pH also gave apparent pKa values of 6.9 and 6.7 for the reduced and oxidized protein, respectively. That it was indeed His 42 (the only His in the polypeptide) that was responsible for the kinetic and spectroscopic pKa values was demonstrated by modification of His 42 of Hipip by the histidine selective reagent diethylpyrocarbonate. No modification of Tyr 19 could be detected. It is concluded that either deprotonation or modification of His 42 results in the destabilization of the reduced cluster and thus a faster rate of oxidation. This work provides the first experimental evidence of the 'squeeze effect' mechanism (Carter, C.W., Jr., Kraut, J., Freer, S.T. and Alden, R.A. (1974) J. Biol. Chem. 249, 6339--6346) in which the polypeptide directly modulates the stability of the iron-sulfur cluster.
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23
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McLachlan AD. Repeated structure and possible gene duplications in high potential iron protein and rubredoxin. J Mol Evol 1980; 15:309-15. [PMID: 7411653 DOI: 10.1007/bf01733137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The three-dimensional structures of bacterial high potential iron protein (HIPIP) and rubredoxin have been searched for repeats to test whether these molecules evolved by independent tandem gene duplications. HIPIP has no structural repeats in spite of the observed repeated pattern in the amino acid sequence from Rhodopseudomonas gelatinosa. Rubredoxin from Clostridium pasteurianum has repeated hairpin loops of ten alpha-carbon atoms on both sides of the active centre iron-sulphur complex, which can be superposed within a root mean square deviation of 0.84 A by rotating about a local pseudodyad axis. The structural repeat matches a weak repeat in the amino acid sequence. It is concluded that the sequence repeats in HIPIP are probably a coincidence but that rubredoxin may have evolved by gene duplication from a dimer of two primitive hairpin loops.
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24
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Feinberg BA, Lau YK. 321 - The electrochemistry of high potential iron-sulfur proteins and their novel brdic̄ka waves. ACTA ACUST UNITED AC 1980. [DOI: 10.1016/0302-4598(80)87039-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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25
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Feinberg BA, Lau YK. The electrochemistry of high potential iron-sulfur proteins and their novel brdička waves. J Electroanal Chem (Lausanne) 1980. [DOI: 10.1016/s0022-0728(80)80228-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Blum H, Salerno JC, Cusanovich MA. Evidence for antiferromagnetic exchange coupling in the tetranuclear high potential iron-sulfur protein of Rhodopseudomonas gelatinosa. Biochem Biophys Res Commun 1978; 84:1125-8. [PMID: 215143 DOI: 10.1016/0006-291x(78)91700-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Bartsch RG. Purification of (4Fe-4S)1--2--ferredoxins (high-potential iron--sulfur proteins) from bacteria. Methods Enzymol 1978; 53:329-40. [PMID: 713842 DOI: 10.1016/s0076-6879(78)53038-3] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Primary structure of a high potential iron sulfur protein from a moderately halophilic denitrifying coccus. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(17)41041-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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