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Modeling Cu(II) binding to peptides using the extensible systematic force field. Bioinorg Chem Appl 2010; 2010:724210. [PMID: 20300581 PMCID: PMC2837899 DOI: 10.1155/2010/724210] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2009] [Accepted: 01/05/2010] [Indexed: 11/24/2022] Open
Abstract
The utility of the extensible systematic force field (ESFF) was tested for copper(II) binding to a 34-amino-acid Cu(II) peptide, which includes five histidine residues and is the putative copper-binding site of lysyl oxidase. To improve computational efficiency, distance geometry calculations were used to constrain all combinations of three histidine ligands to be within bonding distance of the copper and the best results were utilized as starting structures for the ESFF computations. All likely copper geometries were modeled, but the results showed only a small dependence on the geometrical model in that all resulted in a distorted square pyramidal geometry about the copper, some of the imidazole rings were poorly oriented for ligation to the Cu(II), and the copper-nitrogen bond distances were too long. The results suggest that ESFF should be used with caution for Cu(II) complexes where the copper-ligand bonds have significant covalency and when the ligands are not geometrically constrained to be planar.
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Nau WM, Ghale G, Hennig A, Bakirci H, Bailey DM. Substrate-Selective Supramolecular Tandem Assays: Monitoring Enzyme Inhibition of Arginase and Diamine Oxidase by Fluorescent Dye Displacement from Calixarene and Cucurbituril Macrocycles. J Am Chem Soc 2009; 131:11558-70. [DOI: 10.1021/ja904165c] [Citation(s) in RCA: 184] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Werner M. Nau
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
| | - Garima Ghale
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
| | - Andreas Hennig
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
| | - Hüseyin Bakirci
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
| | - David M. Bailey
- School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany
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Agostinelli E, Belli F, Dalla Vedova L, Longu S, Mura A, Floris G. Catalytic Properties and the Role of Copper in Bovine and Lentil Seedling Copper/Quinone‐Containing Amine Oxidases: Controversial Opinions. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200401020] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Enzo Agostinelli
- Department of Biochemical Sciences “A. Rossi Fanelli”, University of Rome “La Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy, Fax: +39‐064‐440‐062
- IBPM, Istituto di Biologia e Patologia Molecolari – CNR, Piazzale Aldo Moro 5, Rome
| | - Francesca Belli
- Department of Biochemical Sciences “A. Rossi Fanelli”, University of Rome “La Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy, Fax: +39‐064‐440‐062
| | - Laura Dalla Vedova
- Department of Biochemical Sciences “A. Rossi Fanelli”, University of Rome “La Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy, Fax: +39‐064‐440‐062
| | - Silvia Longu
- Department of Applied Sciences in Biosystems, University of Cagliari, Cagliari, Italy
| | - Anna Mura
- Department of Applied Sciences in Biosystems, University of Cagliari, Cagliari, Italy
| | - Giovanni Floris
- Department of Applied Sciences in Biosystems, University of Cagliari, Cagliari, Italy
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Shepard EM, Juda GA, Ling KQ, Sayre LM, Dooley DM. Cyanide as a copper and quinone-directed inhibitor of amine oxidases from pea seedlings ( Pisum sativum) and Arthrobacter globiformis: evidence for both copper coordination and cyanohydrin derivatization of the quinone cofactor. J Biol Inorg Chem 2004; 9:256-68. [PMID: 14986071 DOI: 10.1007/s00775-004-0522-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2003] [Accepted: 01/05/2004] [Indexed: 10/26/2022]
Abstract
The interactions of cyanide with two copper-containing amine oxidases (CuAOs) from pea seedlings (PSAO) and the soil bacterium Arthrobacter globiformis (AGAO) have been investigated by spectroscopic and kinetic techniques. Previously, we rationalized the effects of azide and cyanide for several CuAOs in terms of copper coordination by these exogenous ligands and their effects on the internal redox equilibrium TPQ(amr)-Cu(II) right harpoon over left harpoon TPQ(sq)-Cu(I). The mechanism of cyanide inhibition was proposed to occur through complexation to Cu(I), thereby directly competing with O(2) for reoxidation of TPQ. Although cyanide readily and reversibly reacts with quinones, no direct spectroscopic evidence for cyanohydrin derivatization of TPQ has been previously documented for CuAOs. This work describes the first direct spectroscopic evidence, using both model and enzyme systems, for cyanohydrin derivatization of TPQ. K(d) values for Cu(II)-CN(-) and Cu(I)-CN(-), as well as the K(i) for cyanide inhibition versus substrate amine, are reported for PSAO and AGAO. In spite of cyanohydrin derivatization of the TPQ cofactor in these enzymes, the uncompetitive inhibition of amine oxidation is determined to arise almost exclusively through CN(-) complexation of Cu(I).
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Affiliation(s)
- Eric M Shepard
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
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Copper/topa quinone-containing amine oxidases — Recent research developments. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1572-5995(02)80028-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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6
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Reilly TJ, Chance DL, Smith AL. Outer membrane lipoprotein e (P4) of Haemophilus influenzae is a novel phosphomonoesterase. J Bacteriol 1999; 181:6797-805. [PMID: 10542183 PMCID: PMC94146 DOI: 10.1128/jb.181.21.6797-6805.1999] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/1999] [Accepted: 08/10/1999] [Indexed: 11/20/2022] Open
Abstract
Haemophilus influenzae exists as a commensal of the upper respiratory tract of humans but also causes infections of contiguous structures. We describe the identification, localization, purification, and characterization of a novel, surface-localized phosphomonoesterase from a nontypeable H. influenzae strain, R2866. Sequences obtained from two CNBr-derived fragments of this protein matched lipoprotein e (P4) within the H. influenzae sequence database. Escherichia coli DH5alpha transformed with plasmids containing the H. influenzae hel gene, which encodes lipoprotein e (P4), produced high levels of a membrane-associated phosphomonoesterase. The isolated approximately 28-kDa enzyme was tartrate resistant and displayed narrow substrate specificity with the highest activity for arylphosphates, excluding 5-bromo-4-chloro-3-indolylphosphate. Optimum enzymatic activity was observed at pH 5.0 and only in the presence of divalent copper. The enzyme was inhibited by vanadate, molybdate, and EDTA but was resistant to inorganic phosphate. The association of phosphomonoesterase activity with a protein that has also been recognized as a heme transporter suggests a unique role for this unusual phosphohydrolase.
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Affiliation(s)
- T J Reilly
- Department of Molecular Microbiology and Immunology, University of Missouri Medical School, Columbia, Missouri 65212, USA
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Affiliation(s)
- C Hartmann
- Department of Veterans Affairs Medical Center, Molecular Biology Division (151-S), San Francisco, California 94121, USA
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Saxena AK, Saxena P, Monnier VM. Purification and characterization of a membrane-bound deglycating enzyme (1-deoxyfructosyl alkyl amino acid oxidase, EC 1.5.3) from a Pseudomonas sp. soil strain. J Biol Chem 1996; 271:32803-9. [PMID: 8955117 DOI: 10.1074/jbc.271.51.32803] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Searching for novel approaches for uncoupling glycation from hyperglycemia as a cause of diabetic complications, a Pseudomonas sp. soil strain containing a membrane-bound enzyme that deglycates amino acids under release of free fructosamine was isolated (Gerhardinger, C., Marion, S. M., Rovner, A., Glomb, M., and Monnier, V. M. (1995) J. Biol. Chem. 270, 218-224). This enzymatic activity was found to be very sensitive to inactivation by most detergents. From the plasma membrane ( approximately 3 mg/ml protein concentration), the enzyme could be solubilized in active form using 10 mM 3-[(3-chlolamidopropyl) dimethylammonio]-2-hydroxy-1-propanesulfonate aided by 2 M NaCl and 10% glycerol (27% optimal solubilization yield). The supernatant from a 55% saturation (NH4)2SO4 cut was fractionated onto a phenyl-Superose HR 5/5 column and enzymatic activity was eluted with a inverse gradient of (NH4)2SO4. Following removal of (NH4)2SO4 with PD-10 columns and fractionation with a Mono Q HR 5/5 column, a sharp peak of enzyme activity was eluted. Analysis on sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed a major band at 106 kDa and, on isoelectrofocusing gel, a pI of 5.1. The activity was completely inhibited by CN- and N3-, suggestive of copper as a likely cofactor. Identification of the protein was confirmed by affinity labeling with 14CN- and isoelectrofocusing. The "amadoriase" activity was also inhibited by Hg2+, Ag2+, Cu2+, and Zn2+ and had Km and Vmax values of 0.14 mM and 0.48 unit/ml (16 units/mg of protein), respectively, for epsilon-(1-deoxyfructosyl) aminocaproate. Significant activity was noted toward many glycated amino acids (highest with epsilon-fructosyl lysine) but not with glycated proteins. The sequence of the first 16 NH2-terminal amino acids and a search in various data bases revealed that this amadoriase enzyme is a novel protein. Based on its properties, this deglycating enzyme, which degrades Amadori products oxidatively into free fructosamine, is classified as fructosyl aminocaproate:oxygen oxidoreductase (EC 1.5.3).
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Affiliation(s)
- A K Saxena
- Institute of Pathology, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Klinman JP. Mechanisms Whereby Mononuclear Copper Proteins Functionalize Organic Substrates. Chem Rev 1996; 96:2541-2562. [PMID: 11848836 DOI: 10.1021/cr950047g] [Citation(s) in RCA: 645] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Judith P. Klinman
- Departments of Chemistry and Molecular and Cell Biology, University of California, Berkeley, California 94720
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De Biase D, Agostinelli E, De Matteis G, Mondovì B, Morpurgo L. Half-of-the-sites reactivity of bovine serum amine oxidase. Reactivity and chemical identity of the second site. EUROPEAN JOURNAL OF BIOCHEMISTRY 1996; 237:93-9. [PMID: 8620899 DOI: 10.1111/j.1432-1033.1996.0093n.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The organic cofactor of bovine serum amine oxidase was identified as 2,4,5-trihydroxyphenylalanine quinone by means of the phenylhydrazine adduct [Janes, S. M., Mu, D., Wemmer, D., Smith, A. J., Kaur, S., Maltby, D., Burligame, A.L. & Klinman, J.P. (1990) Science 248, 981-987]. A still debated question is, however, whether the dimeric protein binds two mol phenylhydrazine/mole or only one, that is whether it actually contains two identical independent carbonyl cofactors. This matter is addressed in the present study by means of the protein reactions with phenylhydrazine and other inhibitors such as semicarbazide and p-pyridine-2-yl-phenylacetohydrazide. The two latter reagents were found to bind in two steps, one mole/mole dimer in the first step with loss of catalytic activity but only about (0.10-0.35 mol/mol) in the second one. Similar results were obtained by either optical spectroscopy or by reverse-phase HPLC of the labelled peptides produced on proteolysis. Irrespective of the inhibitor nature and reacted amount, all adducts formed on proteolysis a single labelled peptide, of same 25-amino-acid composition, showing that the same cofactor is present in both subunits, in the same stretch of the polypeptide chain. The slow reaction of the second cofactor may be related to slow conformational equilibria, which are established after the first cofactor has reacted and are probably mediated by a change of the hydrogen bond pattern. The conformers spectroscopic properties suggest that they differ in whether the cofactor does or does not directly interact with copper.
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Affiliation(s)
- D De Biase
- Dipartimento di Scienze Biochimiche A. Rossi Fanelli, Università La Sapienza, Roma, Italy
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He Z, Nadkarni DV, Sayre LM, Greenaway FT. Mechanism-based inactivation of porcine kidney diamine oxidase by 1,4-diamino-2-butene. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1253:117-27. [PMID: 7492592 DOI: 10.1016/0167-4838(95)00158-q] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Cis- and trans-1,4-diamino-2-butene are substrates and potent inactivators of porcine kidney diamine oxidase. Evidence from absorption and NMR spectra indicates that both are oxidized to pyrrole. Both substrates are irreversible mechanism-based inactivators of the enzyme, although the trans isomer is more potent and results in complete inactivation in a reaction which follows pseudo-first-order kinetics with an apparent Ki of 0.34 mM and a second-order inactivation constant of 500 M-1 s-1. Under the same conditions, 46% of the activity remains when the enzyme is reacted with cis-1,4-diamino-2-butene. Trans-4-amino-2-butenal, the product of oxidation of the trans diamine, has been synthesized and shown to undergo cyclization to pyrrole in a concentration-dependent manner, approaching second-order at low concentrations. Trans-4-amino-2-butenal is itself a potent irreversible inhibitor with IC50 of 2.5 microM. We propose that the irreversible inactivation by both cis- and trans-1,4-diamino-2-butene involves attack by a protein-based nucleophilic residue on the unsaturated aminoenal products of the enzymatic reactions, resulting in a covalent adduct. Cyclization of the cis-aminoenal to pyrrole is much more rapid than in the trans case, thus it is less available for inhibitory reaction with the protein.
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Affiliation(s)
- Z He
- Gustaf H. Carlson School of Chemistry, Clark University, Worcester, MA 01610, USA
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