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Étude des propriétés d’oxydoréduction de complexes métalliques de divers cycles tétrapyrroliques. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1974710517] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Étude des propriétés d’oxydoréduction de complexes métalliques de divers cycles tétrapyrroliques. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1974710511] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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N° 12. — Photochromisme des bases de Schiff : influence du milieu sur les propriétés photochimiques de la salicydilène aniline et salicylidène méta toluidine. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1968650292] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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N° 65. — Résonance magnétique du proton dans des solutions acides de complexes ferriques. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1968650816] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Le premier état triplet phosphorescent de la phénoxazine
Et de la phénothiazine. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1968651876] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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6
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Photoinitiated Electron Transfer in Carotenoporphyrin-Quinone Triads: Enhanced Quantum Yields via Control of Reaction Exergonicity. Isr J Chem 2013. [DOI: 10.1002/ijch.198800017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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7
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Zn–polyphenol chelation: complexes with quercetin, (+)-catechin, and derivatives: II Electrochemical and EPR studies. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.11.046] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Zn–polyphenol chelation: complexes with quercetin, (+)-catechin, and derivatives: I optical and NMR studies. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.09.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
The locus of oxidation in square-planar nickel(ii) oxamato complexes can be continuously shifted from the metal to the ligand by an appropriate choice of electron-donating substituents on the aromatic moiety of the ligand.
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The naphthoquinol oxidizing cytochrome bc1 complex of the hyperthermophilic knallgasbacterium Aquifex aeolicus: properties and phylogenetic relationships. Biochemistry 2003; 42:10800-8. [PMID: 12962505 DOI: 10.1021/bi034452a] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phylogenetic analysis of constituent proteins of Rieske/cytochrome b complexes [Schütz et al. (2000) J. Mol. Biol. 300, 663-675] indicated that the respective enzyme from the hyperthermophile Aquifex (A.) aeolicus is closely related to proteobacterial counterparts, in disagreement with positioning of its parent species on small subunit rRNA trees. An assessment of the details and possible reasons for this discrepancy necessitates a thorough understanding of the biochemical and biophysical properties of the enzyme in addition to the bioinformatic data. The cytochrome bc(1) complex from A. aeolicus, which is part of the "Knallgasreaction" pathway, was therefore studied in membranes and in detergent-solubilized, isolated complex. Hemes b(L) (E(m,7) = -190 mV; g(z)= 3.7), b(H) (E(m,7) = -60 mV; g(z )= 3.45), and c(1) (E(m,7) = +160 mV; g(z )= 3.55) were identified by EPR and optical spectroscopy in combination with electrochemical methods. Two electrochemically distinct (E(m,7) = +95 mV; E(m,7) = +210 mV) Rieske centers were detected in membranes, and the +210 mV species was shown to correspond to the Rieske center of the cyt bc(1) complex. The gene coding for this latter Rieske protein was heterologously expressed in Escherichia coli, and the resulting protein was characterized in detail. The pool quinone of A. aeolicus was determined to be naphthoquinone. The redox poises of the individual electron-transfer steps are compared to those of other Rieske/cyt b complexes. The Aquifex enzyme was found to represent the only extant naphthoquinol oxidizing true cyt bc(1) complex described so far. An improved scenario for the phylogenetic positioning of the Aquifex cyt bc(1) complex is proposed.
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12
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Molecular environment effects in redox chemistry. Reversible multielectron oxidation of amide-linked basket-handle metalloporphyrins. J Am Chem Soc 2002. [DOI: 10.1021/ja00333a035] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Aqueous Chemistry of High-Valent Manganese. Structure, Magnetic, and Redox Properties of a New Type of Mn-Oxo Cluster, [Mn4IVO4(bpy)6]4+: Relevance to the Oxygen Evolving Center in Plants. J Am Chem Soc 2002. [DOI: 10.1021/ja00098a016] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Reversible two-electron-one-proton systems in the ring-centered oxidation of metalloporphyrins bearing secondary amide-linked superstructures. J Am Chem Soc 2002. [DOI: 10.1021/ja00005a022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Chemical catalysis of electrochemical reactions. Homogeneous catalysis of the electrochemical reduction of carbon dioxide by iron("0") porphyrins. Role of the addition of magnesium cations. J Am Chem Soc 2002. [DOI: 10.1021/ja00022a038] [Citation(s) in RCA: 263] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Electrochemistry of vitamin B-12. 4. Kinetics and mechanisms in B-12a-B-12r oxido-reduction. J Am Chem Soc 2002. [DOI: 10.1021/ja00496a034] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Electrochemistry of vitamin B12. 3. One-electron intermediates in the reduction of methylcobalamin and methylcobinamide. J Am Chem Soc 2002. [DOI: 10.1021/ja00478a048] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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One-electron reduction of chromium(III) porphyrins: formation of chromium(II) porphyrins or chromium(III) porphyrin .pi.-radical anions. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100190a062] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Does one-electron transfer to nickel(II) porphyrins involve the metal or the porphyrin ligand? Inorg Chem 2002. [DOI: 10.1021/ic00300a009] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Outer-sphere and inner-sphere processes in reductive elimination. Direct and indirect electrochemical reduction of vicinal dibromoalkanes. J Am Chem Soc 2002. [DOI: 10.1021/ja00173a002] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Electron-transfer dynamics in highly reduced states of simple and superstructured metalloporphyrins. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100182a045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Electrochemistry of hanging-base basket-handle iron porphyrins. Coordination of iron(II) by the base and dioxygen. Inorg Chem 2002. [DOI: 10.1021/ic00247a017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Mixed-valent states in the redox chemistry of double- and triple-decker-sandwich free base and copper porphyrins. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100124a051] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Electrochemistry of iron(I) porphyrins in the presence of carbon monoxide. Comparison with zinc porphyrins. Inorg Chem 2002. [DOI: 10.1021/ic00087a038] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Molecular environment effects in redox and coordination chemistry. Protection against solvation, local solvation, and steric hindrance to ligation in the electrochemistry of basket-handle iron porphyrins. Inorg Chem 2002. [DOI: 10.1021/ic00243a046] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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28
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Molecular environment effects in redox chemistry. Electrochemistry of ether-linked basket-handle and amide-linked basket-handle and picket-fence iron porphyrins. J Am Chem Soc 2002. [DOI: 10.1021/ja00329a020] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Reaction of carbon monoxide with alkyliron porphyrins generated from alkyl halides and electrochemically produced iron(I) and iron(0)porphyrins. J Am Chem Soc 2002. [DOI: 10.1021/ja00161a035] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Electroreductive alkylation of iron porphyrins. Iron(III), iron(II) and iron(I) alkyl complexes from the reaction of doubly reduced iron(II) porphyrins with alkyl halides. Organometallics 2002. [DOI: 10.1021/om00138a022] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Arylation and vinylation of iron porphyrins. Double electrochemical induction of a nucleophilic substitution. J Am Chem Soc 2002. [DOI: 10.1021/ja00376a043] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Chemical vs. redox catalysis of electrochemical reactions. Reduction of trans-1,2-dibromocyclohexane by electrogenerated aromatic anion radicals and low oxidation state metalloporphyrins. J Am Chem Soc 2002. [DOI: 10.1021/ja00255a036] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Ultraefficient selective homogeneous catalysis of the electrochemical reduction of carbon dioxide by an iron(0) porphyrin associated with a weak Broensted acid cocatalyst. J Am Chem Soc 2002. [DOI: 10.1021/ja00090a068] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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35
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36
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Redox properties and stability of hydroxy complexes of protected iron(III) and iron(II) porphyrins. Inorg Chem 2002. [DOI: 10.1021/ic00196a002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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37
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Electroreductive alkylation of iron in porphyrin complexes. Electrochemical and spectral characteristics of .sigma.-alkylironporphyrins. J Am Chem Soc 2002. [DOI: 10.1021/ja00413a004] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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sigma.-Alkyl iron porphyrins from sterically encumbered alkyl halides and iron(0) porphyrins. Stabilities of the four accessible oxidation states. Organometallics 2002. [DOI: 10.1021/om00109a005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Cellulosome from Clostridium cellulolyticum: molecular study of the Dockerin/Cohesin interaction. Biochemistry 1999; 38:12822-32. [PMID: 10504252 DOI: 10.1021/bi9911740] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Clostridium cellulolyticum produces cellulolytic complexes (cellulosomes) made of 10-13 cell wall degrading enzymes tightly bound to a scaffolding protein (CipC) by means of their dockerin domain. It has previously been shown that the receptor domains in CipC are the cohesin domains and that the cohesin/dockerin interaction is calcium-dependent. In the present study, surface plasmon resonance was used to demonstrate that the free cohesin1 from CipC and dockerin from CelA have the same K(D) (2.5 x 10(-)(10) M) as that of the entire CelA and a larger fragment of CipC, the latter of which contains, in addition to cohesin1, a cellulose binding domain and a hydrophilic domain of unknown function. This demonstrates that neither the catalytic domain of CelA nor the noncohesin domains of CipC have any influence on the interaction. Dockerin domains are composed of two conserved segments of 22 residues: removal of the second segment abolishes the affinity for cohesin1, whereas modified dockerins having twice the first segment, twice the second, or both segments but in a reverse order have K(D) values for cohesin1 in the same range as that observed for wild-type dockerin. These data indicate that if two segments are required for the complexation with the cohesin, segments 1 and 2 are similar enough to replace each other. Calcium overlay experiments revealed that the dockerin domain has one calcium binding site per conserved segment. Circular dichroism performed on wild-type and mutant dockerins indicates that this domain is well structured and that removal of calcium only weakly affects the secondary structure, which remains 40-45% helical.
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41
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Influence of Molecular Oxygen on the Charge Transfer Properties of a Co(II)Porphyrin-Al(III)Phthalocyanine Aggregate. Excited States Dynamics and Photobiological Activities. J Phys Chem A 1999. [DOI: 10.1021/jp983936r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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43
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Metal Alkylation of Electrochemically Generated Low-Valent Metalloporphyrins. Is There Something Special with Rhodium? Organometallics 1998. [DOI: 10.1021/om971035j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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Association of bile-salt-dependent lipase with membranes of human pancreatic microsomes is under the control of ATP and phosphorylation. Biochem J 1997; 327 ( Pt 2):527-35. [PMID: 9359426 PMCID: PMC1218826 DOI: 10.1042/bj3270527] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Bile-salt-dependent lipase (BSDL) is secreted by the pancreas into the duodenum, where it catalyses the hydrolysis of dietary lipid esters on activation by bile salts. The secretion pathway of BSDL is comparable with that of other digestive enzymes produced by pancreatic acinar cells. However, in contrast with these other enzymes, BSDL is partly associated with endoplasmic reticulum membranes as part of a folding complex, including a Grp94-related protein to which BSDL is transiently linked. The release of BSDL from membranes occurs once its glycosylation is completed [Bruneau and Lombardo (1995) J. Biol. Chem. 270, 13524-13533]. In the present study, investigations concerning the mechanism of association/dissociation of BSDL with membranes of microsomes were performed. For this purpose the role of ATP and that of the possible phosphorylation of BSDL were examined. For the first time, it is shown that human pancreatic BSDL is phosphorylated, probably at a serine residue, during its transport within the acinar cell. The phosphorylation of BSDL is provoked by calphostin C, an inhibitor of protein kinase C. In the presence of 1-(isoquinolinesulphonyl)2-methylpiperazine, a non-specific inhibitor of serine/threonine protein kinase A, C or G, or of calcium chelator 1,2-bis(O-aminophenoxy)ethane-N,N,N', N'-tetra-acetic tetra(acetoxymethyl)ester, the phosphorylation of BSDL elicited by calphostin C is abolished. These data suggested that the phosphorylation of BSDL within human pancreatic microsomes is under the control of a cascade of protein kinases. We have also shown that the phosphorylation of BSDL appears to be involved in the release of the enzyme from microsome membranes. Nevertheless ATP, which modifies the conformation of BSDL, triggers this association, and an unhydrolysable ATP analogue was unable to promote it.
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45
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Electrochemical Generation of Rhodium Porphyrin Hydrides. Catalysis of Hydrogen Evolution. J Am Chem Soc 1997. [DOI: 10.1021/ja964100+] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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46
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Reductive Electrochemistry of Rhodium Porphyrins. Disproportionation of Intermediary Oxidation States. J Am Chem Soc 1997. [DOI: 10.1021/ja964023i] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Catalysis of the Electrochemical Reduction of Carbon Dioxide by Iron(0) Porphyrins. Synergistic Effect of Lewis Acid Cations. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9618486] [Citation(s) in RCA: 144] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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48
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Low temperature spectroelectrochemistry for the characterization of highly reduced σ-alkyl iron halogenated porphyrins. ELECTROANAL 1996. [DOI: 10.1002/elan.1140081110] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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49
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Electron transfer in tetrahemic cytochromes c3: spectroelectrochemical evidence for a conformational change triggered by heme IV reduction. Biochemistry 1996; 35:13411-8. [PMID: 8873609 DOI: 10.1021/bi9608424] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Electron transfer in tetrahemic cytochromes c3 from Desulfovibrio vulgaris Hildenborough (D.v.H.) and Desulfovibrio desulfuricans Norway (D.d.N.) strains has been investigated by thin layer spectroelectrochemistry with visible absorption, CD, and resonance Raman (RR) monitoring. The observed splitting of the isosbestic point in the Soret absorption band indicates that the electron transfer from the (FeIII)4 state to the (FeII)4 state proceeds via an intermediate species, which corresponds to 25 and 50% reduction for the D.v.H. cyt.c3 and the D.d.N. cyt.c3, respectively. For the latter, a specific CD signal is observed at half-reduction. RR monitoring of the redox process does not reveal multiple splitting of the high-frequency RR bands, at variance with previously published results on the enzymatic reduction of cyt.c3 from Desulfovibrio vulgaris Miyazaki, a cytochrome highly homologous to D.v.H. cyt.c3 [Verma, A.L., Kimura, A., Nakamura, A., Yagi, T., Inoguchi, H., & Kitagawa, T. (1988) J. Am. Chem. Soc. 110, 6617-6623]. The low-frequency RR spectra of the intermediate species differ significantly from the ones calculated from a linear combination of the all-ferric and all-ferrous states, for the same reduction ratio. Frequency shifts of the bending modes of the cysteine and propionate heme substituents are observed, as well as changes specific to each cytochrome; most notable is the activation of two torsional modes in the case of D.d.N. cyt.c3. Comparison of the results obtained for the two cytochromes leads to the conclusion that reduction of heme IV triggers the observed conformational change. This conclusion is supported by the spectroelectrochemical investigation of the mutant D.v.H. cyt.c3 H25M, in which the sixth ligand of heme III, histidine, is replaced by a methionine.
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50
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