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John Enemark

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Amanda C Davis; Robert E Berry; Matthew J Cornelison; Kimberly T Meyers; Asha Rajapakshe; Gordon Tollin; John H Enemark
Effects of mutating aromatic surface residues of the heme domain of human sulfite oxidase on its heme midpoint potential, intramolecular electron transfer, and steady-state kinetics.
Asha Rajapakshe; Gordon Tollin; John H Enemark
Kinetic and thermodynamic effects of mutations of human sulfite oxidase.
Asha Rajapakshe; Gordon Tollin; Robert E Berry; Kimberly T Meyers; John H Enemark
Intramolecular electron transfer in sulfite-oxidizing enzymes: probing the role of aromatic amino acids.

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2013: Amanda C Davis; Robert E Berry; Matthew J Cornelison; Kimberly T Meyers; Asha Rajapakshe; Gordon Tollin; John H Enemark
Effects of mutating aromatic surface residues of the heme domain of human sulfite oxidase on its heme midpoint potential, intramolecular electron transfer, and steady-state kinetics.
Dalton transactions (Cambridge, England : 2003) 2013;42(9):3043-9.
2012: Asha Rajapakshe; Gordon Tollin; John H Enemark
Kinetic and thermodynamic effects of mutations of human sulfite oxidase.
Chemistry & biodiversity 2012;9(9):1621-34.
2012: Asha Rajapakshe; Gordon Tollin; Robert E Berry; Kimberly T Meyers; John H Enemark
Intramolecular electron transfer in sulfite-oxidizing enzymes: probing the role of aromatic amino acids.
Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry 2012;17(3):345-52.
2012: Andrei V Astashkin; Matthew J Cornelison; Kayunta Johnson-Winters; Asha Rajapakshe; John H Enemark
Determination of the distance between the Mo(V) and Fe(III) heme centers of wild type human sulfite oxidase by pulsed EPR spectroscopy.
The journal of physical chemistry. B 2012;116(6):1942-50.
2012: Eric L Klein; Alexey Potapov; Arnold M Raitsimring; Asha Rajapakshe; Anna R Arnold; Andrei V Astashkin; Daniella Goldfarb; Kayunta Johnson-Winters; John H Enemark
Identity of the exchangeable sulfur-containing ligand at the Mo(V) center of R160Q human sulfite oxidase.
Inorganic chemistry 2012;51(3):1408-18.
2011: Nicholas J Wiebelhaus; Matthew A Cranswick; Eric L Klein; Dennis L Lichtenberger; L Tori Lockett; John H Enemark
Metal-sulfur valence orbital interaction energies in metal-dithiolene complexes: determination of charge and overlap interaction energies by comparison of core and valence ionization energy shifts.
Inorganic chemistry 2011;50(21):11021-31.
2011: Asha Rajapakshe; Debora Reichmann; Andrei V Astashkin; Florian Bittner; Eric L Klein; Ralf R Mendel; John H Enemark
Structural studies of the molybdenum center of mitochondrial amidoxime reducing component (mARC) by pulsed EPR spectroscopy and 17O-labeling.
Biochemistry 2011;50(41):8813-22.
2011: John H Enemark; Arnold M Raitsimring; Andrei V Astashkin; Eric L Klein
Implications for the mechanism of sulfite oxidizing enzymes from pulsed EPR spectroscopy and DFT calculations for "difficult" nuclei.
Faraday discussions 2011;148():249-67; discussion 299-314.
2010: Kayunta Johnson-Winters; Anna R Nordstrom; Amanda C Davis; Gordon Tollin; John H Enemark
Effects of large-scale amino acid substitution in the polypeptide tether connecting the heme and molybdenum domains on catalysis in human sulfite oxidase.
Metallomics : integrated biometal science 2010;2(11):766-70.
2010: Kayunta Johnson-Winters; Gordon Tollin; John H Enemark
Elucidating the catalytic mechanism of sulfite oxidizing enzymes using structural, spectroscopic, and kinetic analyses.
Biochemistry 2010;49(34):7242-54.
2010: Asha Rajapakshe; Kayunta Johnson-Winters; Anna R Nordstrom; Kimberly T Meyers; Safia Emesh; Andrei V Astashkin; John H Enemark
Characterization of chloride-depleted human sulfite oxidase by electron paramagnetic resonance spectroscopy: experimental evidence for the role of anions in product release.
Biochemistry 2010;49(25):5154-9.
2010: Trevor D Rapson; Andrei V Astashkin; Kayunta Johnson-Winters; Paul V Bernhardt; Ulrike Kappler; Arnold M Raitsimring; John H Enemark
Pulsed EPR investigations of the Mo(V) centers of the R55Q and R55M variants of sulfite dehydrogenase from Starkeya novella.
Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry 2010;15(4):505-14.
2010: Kayunta Johnson-Winters; Anna R Nordstrom; Safia Emesh; Andrei V Astashkin; Asha Rajapakshe; Robert E Berry; Gordon Tollin; John H Enemark
Effects of interdomain tether length and flexibility on the kinetics of intramolecular electron transfer in human sulfite oxidase.
Biochemistry 2010;49(6):1290-6.
2009: Aaron K Vannucci; Rae Ana Snyder; Nadine E Gruhn; Dennis L Lichtenberger; John H Enemark
New insights into solvolysis and reorganization energy from gas-phase, electrochemical, and theoretical studies of oxo-Tp*Mo(V) molecules.
Inorganic chemistry 2009;48(18):8856-62.
2009: Andrei V Astashkin; Eric L Klein; Dmitry Ganyushin; Kayunta Johnson-Winters; Frank Neese; Ulrike Kappler; John H Enemark
Exchangeable oxygens in the vicinity of the molybdenum center of the high-pH form of sulfite oxidase and sulfite dehydrogenase.
Physical chemistry chemical physics : PCCP 2009;11(31):6733-42.
2009: Eric L Klein; Andrei V Astashkin; Dmitry Ganyushin; Christoph Riplinger; Kayunta Johnson-Winters; Frank Neese; John H Enemark
Direct detection and characterization of chloride in the active site of the low-pH form of sulfite oxidase using electron spin echo envelope modulation spectroscopy, isotopic labeling, and density functional theory calculations.
Inorganic chemistry 2009;48(11):4743-52.
2009: Safia Emesh; Trevor D Rapson; Asha Rajapakshe; Ulrike Kappler; Paul V Bernhardt; Gordon Tollin; John H Enemark
Intramolecular electron transfer in sulfite-oxidizing enzymes: elucidating the role of a conserved active site arginine.
Biochemistry 2009;48(10):2156-63.
2008: John H Enemark; Andrei V Astashkin; Arnold M Raitsimring
Structures and reaction pathways of the molybdenum centres of sulfite-oxidizing enzymes by pulsed EPR spectroscopy.
Biochemical Society transactions 2008;36(Pt 6):1129-33.
2008: Andrei V Astashkin; Kayunta Johnson-Winters; Eric L Klein; Changjian Feng; Heather L Wilson; KV Rajagopalan; Arnold M Raitsimring; John H Enemark
Structural studies of the molybdenum center of the pathogenic R160Q mutant of human sulfite oxidase by pulsed EPR spectroscopy and 17O and 33S labeling.
Journal of the American Chemical Society 2008;130(26):8471-80.
2007: Matthew A Cranswick; Alice Dawson; J Jon A Cooney; Nadine E Gruhn; Dennis L Lichtenberger; John H Enemark
Photoelectron spectroscopy and electronic structure calculations of d1 vanadocene compounds with chelated dithiolate ligands: implications for pyranopterin Mo/W enzymes.
Inorganic chemistry 2007;46(25):10639-46.
2007: Andrei V Astashkin; Kayunta Johnson-Winters; Eric L Klein; Robert S Byrne; Russ Hille; Arnold M Raitsimring; John H Enemark
Direct demonstration of the presence of coordinated sulfate in the reaction pathway of Arabidopsis thaliana sulfite oxidase using 33S labeling and ESEEM spectroscopy.
Journal of the American Chemical Society 2007;129(47):14800-10.
2007: Andrei V Astashkin; Eric L Klein; John H Enemark
Toward modeling the high chloride, low pH form of sulfite oxidase: Ka-band ESEEM of equatorial chloro ligands in oxomolybdenum(V) complexes.
Journal of inorganic biochemistry 2007;101(11-12):1623-9.
2007: Changjian Feng; Gordon Tollin; John H Enemark
Sulfite oxidizing enzymes.
Biochimica et biophysica acta 2007;1774(5):527-39.
2006: Ulrike Kappler; Susan Bailey; Changjian Feng; Michael J Honeychurch; Graeme R Hanson; Paul V Bernhardt; Gordon Tollin; John H Enemark
Kinetic and structural evidence for the importance of Tyr236 for the integrity of the Mo active site in a bacterial sulfite dehydrogenase.
Biochemistry 2006;45(32):9696-705.
2006: John H Enemark; Andrei V Astashkin; Arnold M Raitsimring
Investigation of the coordination structures of the molybdenum(v) sites of sulfite oxidizing enzymes by pulsed EPR spectroscopy.
Dalton transactions (Cambridge, England : 2003) 2006;(29):3501-14.
2006: Changjian Feng; Gordon Tollin; Michael A Holliday; Clayton Thomas; John Salerno; John H Enemark; Dipak K Ghosh
Intraprotein electron transfer in a two-domain construct of neuronal nitric oxide synthase: the output state in nitric oxide formation.
Biochemistry 2006;45(20):6354-62.
2006: Changjian Feng; Clayton Thomas; Michael A Holliday; Gordon Tollin; John Salerno; Dipak K Ghosh; John H Enemark
Direct measurement by laser flash photolysis of intramolecular electron transfer in a two-domain construct of murine inducible nitric oxide synthase.
Journal of the American Chemical Society 2006;128(11):3808-11.
2006: Frank Earl Inscore; Sushilla Z Knottenbelt; Nick D Rubie; Hemant Joshi; Martin L Kirk; John H Enemark
Understanding the origin of metal-sulfur vibrations in an oxo-molybdenum dithiolene complex: relevance to sulfite oxidase.
Inorganic chemistry 2006;45(3):967-76.
2005: Andrei V Astashkin; Frank Neese; Arnold M Raitsimring; J Jon A Cooney; Eric Bultman; John H Enemark
Pulsed EPR investigations of systems modeling molybdenum enzymes: hyperfine and quadrupole parameters of oxo-17O in [Mo 17O(SPh)4]-.
Journal of the American Chemical Society 2005;127(47):16713-22.
2005: Changjian Feng; Heather L Wilson; Gordon Tollin; Andrei V Astashkin; James T Hazzard; KV Rajagopalan; John H Enemark
The pathogenic human sulfite oxidase mutants G473D and A208D are defective in intramolecular electron transfer.
Biochemistry 2005;44(42):13734-43.
2005: Arnold M Raitsimring; Ulrike Kappler; Changjian Feng; Andrei V Astashkin; John H Enemark
Pulsed EPR studies of a bacterial sulfite-oxidizing enzyme with pH-invariant hyperfine interactions from exchangeable protons.
Inorganic chemistry 2005;44(21):7283-5.
2005: Andrei V Astashkin; Brian L Hood; Changjian Feng; Russ Hille; Ralf R Mendel; Arnold M Raitsimring; John H Enemark
Structures of the Mo(V) forms of sulfite oxidase from Arabidopsis thaliana by pulsed EPR spectroscopy.
Biochemistry 2005;44(40):13274-81.
2005: Michele Mader Cosper; Frank Neese; Andrei V Astashkin; Michael D Carducci; Arnold M Raitsimring; John H Enemark
Determination of the g-tensors and their orientations for cis,trans-(L-N2S2)Mo(V)OX (X = Cl, SCH2Ph) by single-crystal EPR spectroscopy and molecular orbital calculations.
Inorganic chemistry 2005;44(5):1290-301.
2005: Andrei V Astashkin; Changjian Feng; Arnold M Raitsimring; John H Enemark
17O ESEEM evidence for exchange of the axial oxo ligand in the molybdenum center of the high pH form of sulfite oxidase.
Journal of the American Chemical Society 2005;127(2):502-3.
2004: J Jon A Cooney; Matthew A Cranswick; Nadine E Gruhn; Hemant Joshi; John H Enemark
Electronic structure of bent titanocene complexes with chelated dithiolate ligands.
Inorganic chemistry 2004;43(25):8110-8.
2004: Hemant Joshi; John H Enemark
Geometrical control of the active site electronic structure of pyranopterin enzymes by metal-dithiolate folding: aldehyde oxidase.
Journal of the American Chemical Society 2004;126(38):11784-5.
2004: Kowliki Nagarajan; Hemant Joshi; Pradeep K Chaudhury; Kuntal Pal; J Jon A Cooney; John H Enemark; Sabyasachi Sarkar
Structural and functional analogue of the active site of polysulfide reductase from Wolinella succinogenes.
Inorganic chemistry 2004;43(15):4532-3.
2004: Rebecca L McNaughton; Matthew E Helton; Michele Mader Cosper; John H Enemark; Martin L Kirk
Nature of the oxomolybdenum-thiolate pi-bond: implications for Mo-S bonding in sulfite oxidase and xanthine oxidase.
Inorganic chemistry 2004;43(5):1625-37.
2004: John H Enemark; J Jon A Cooney; Jun-Jieh Wang; R H Holm
Synthetic analogues and reaction systems relevant to the molybdenum and tungsten oxotransferases.
Chemical reviews 2004;104(2):1175-200.
2003: Changjian Feng; Ulrike Kappler; Gordon Tollin; John H Enemark
Intramolecular electron transfer in a bacterial sulfite dehydrogenase.
Journal of the American Chemical Society 2003;125(48):14696-7.
2003: Changjian Feng; Heather L Wilson; John K Hurley; James T Hazzard; Gordon Tollin; KV Rajagopalan; John H Enemark
Essential role of conserved arginine 160 in intramolecular electron transfer in human sulfite oxidase.
Biochemistry 2003;42(42):12235-42.
2003: Hemant Joshi; J Jon A Cooney; Frank Earl Inscore; Nadine E Gruhn; Dennis L Lichtenberger; John H Enemark
Investigation of metal-dithiolate fold angle effects: implications for molybdenum and tungsten enzymes.
Proceedings of the National Academy of Sciences of the United States of America 2003;100(7):3719-24.
2003: Changjian Feng; Heather L Wilson; John K Hurley; James T Hazzard; Gordon Tollin; KV Rajagopalan; John H Enemark
Role of conserved tyrosine 343 in intramolecular electron transfer in human sulfite oxidase.
The Journal of biological chemistry 2003;278(5):2913-20.
2003: Arnold M Raitsimring; Andrei V Astashkin; Changjian Feng; John H Enemark; Kimberly Johnson Nelson; KV Rajagopalan
Pulsed EPR studies of the exchangeable proton at the molybdenum center of dimethyl sulfoxide reductase.
Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry 2003;8(1-2):95-104.
2002: J Jon A Cooney; Michael D Carducci; Anne E McElhaney; Hugh D Selby; John H Enemark
New oxovanadium bis(1,2-dithiolate) compounds that mimic the hydrogen-bonding interactions at the active sites of mononuclear molybdenum enzymes.
Inorganic chemistry 2002;41(26):7086-93.
2002: Sean J Elliott; Anne E McElhaney; Changjian Feng; John H Enemark; Fraser A Armstrong
A voltammetric study of interdomain electron transfer within sulfite oxidase.
Journal of the American Chemical Society 2002;124(39):11612-3.
2002: Xue-Bin Wang; Frank Earl Inscore; Xin Yang; J Jon A Cooney; John H Enemark; Lai-Sheng Wang
Probing the electronic structure of [MoOS(4)](-) centers using anionic photoelectron spectroscopy.
Journal of the American Chemical Society 2002;124(34):10182-91.
2002: Andrei V Astashkin; Arnold M Raitsimring; Changjian Feng; Jean L Johnson; KV Rajagopalan; John H Enemark
Pulsed EPR studies of nonexchangeable protons near the Mo(V) center of sulfite oxidase: direct detection of the alpha-proton of the coordinated cysteinyl residue and structural implications for the active site.
Journal of the American Chemical Society 2002;124(21):6109-18.
2002: Julie N Graff; Anne E McElhaney; Partha Basu; Nadine E Gruhn; Chaung-Sheng J Chang; John H Enemark
Electrochemistry and photoelectron spectroscopy of oxomolybdenum(V) complexes with phenoxide ligands: effect of para substituents on redox potentials, heterogeneous electron transfer rates, and ionization energies.
Inorganic chemistry 2002;41(10):2642-7.
2002: Changjian Feng; Rohit V Kedia; James T Hazzard; John K Hurley; Gordon Tollin; John H Enemark
Effect of solution viscosity on intramolecular electron transfer in sulfite oxidase.
Biochemistry 2002;41(18):5816-21.
2002: Rachel Codd; Andrei V Astashkin; Andrew Pacheco; Arnold M Raitsimring; John H Enemark
Pulsed ELDOR spectroscopy of the Mo(V)/Fe(III) state of sulfite oxidase prepared by one-electron reduction with Ti(III) citrate.
Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry 2002;7(3):338-50.
2002: John H Enemark; Michele Mader Cosper
Molybdenum enzymes and sulfur metabolism.
Metal ions in biological systems 2002;39():621-54.
2001: Jonathan McMaster; Michael D Carducci; Y S Yang; E I Solomon; John H Enemark
Electronic spectral studies of molybdenyl complexes. 2. MCD spectroscopy of [MoOS4]- centers.
Inorganic chemistry 2001;40(4):687-702.
2000: Andrei V Astashkin; Michele Mader Cosper; Arnold M Raitsimring; John H Enemark
ESEEM and mims ENDOR spectroscopies of cis,trans-(L-N2S2)MoVO(SCH2Ph): detection of the two benzylthiolate alpha protons.
Inorganic chemistry 2000;39(21):4989-92.
2000: Matthew E Helton; Andrew Pacheco; Jonathan McMaster; John H Enemark; Martin L Kirk
An MCD spectroscopic study of the molybdenum active site in sulfite oxidase: insight into the role of coordinated cysteine.
Journal of inorganic biochemistry 2000;80(3-4):227-33.
2000: M L Mader; Michael D Carducci; John H Enemark
Analogues for the molybdenum center of sulfite oxidase: oxomolybdenum(V) complexes with three thiolate sulfur donor atoms.
Inorganic chemistry 2000;39(3):525-31.
1999: Andrew Pacheco; James T Hazzard; Gordon Tollin; John H Enemark
The pH dependence of intramolecular electron transfer rates in sulfite oxidase at high and low anion concentrations.
Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry 1999;4(4):390-401.
1998: Jonathan McMaster; John H Enemark
The active sites of molybdenum- and tungsten-containing enzymes.
Current opinion in chemical biology 1998;2(2):201-7.
1997: Caroline Kisker; Hermann Schindelin; Andrew Pacheco; William A Wehbi; Robert M Garrett; KV Rajagopalan; John H Enemark; Douglas C Rees
Molecular basis of sulfite oxidase deficiency from the structure of sulfite oxidase.
Cell 1997;91(7):973-83.
1993: E P Sullivan; James T Hazzard; Gordon Tollin; John H Enemark
Electron transfer in sulfite oxidase: effects of pH and anions on transient kinetics.
Biochemistry 1993;32(46):12465-70.
1992: C S Chang; T J Pecci; M D Carducci; John H Enemark
Structure of bis(4-chlorophenolato)[hydrotris(3,5-dimethyl-1- pyrazolyl)borato]oxomolybdenum(V).
Acta crystallographica. Section C, Crystal structure communications 1992;48 ( Pt 6)():1096-7.
1989: S A Roberts; John H Enemark
Bis(benzenethiolato)nitrosyl [tris(3,5-dimethyl-1-pyrazolyl)hydroborato]-molybdenum(II) .
Acta crystallographica. Section C, Crystal structure communications 1989;45 ( Pt 9)():1292-4.
1989: C A Kipke; W E Cleland; S A Roberts; John H Enemark
Structure of oxobis(phenolato)[tris(3,5-dimethyl-1-pyrazolyl)-hydroborato]molybdenum (V).
Acta crystallographica. Section C, Crystal structure communications 1989;45 ( Pt 6)():870-2.
1989: Graham Neil George; C A Kipke; Roger C Prince; Roger A Sunde; John H Enemark; S P Cramer
Structure of the active site of sulfite oxidase. X-ray absorption spectroscopy of the Mo(IV), Mo(V), and Mo(VI) oxidation states.
Biochemistry 1989;28(12):5075-80.
1989: C A Kipke; John H Enemark; Roger A Sunde
Purification of prosthetically intact sulfite oxidase from chicken liver using a modified procedure.
Archives of biochemistry and biophysics 1989;270(1):383-90.
1988: Graham Neil George; Roger C Prince; C A Kipke; Roger A Sunde; John H Enemark
The nature of the phosphate complex of sulphite oxidase from electron-paramagnetic-resonance studies.
The Biochemical journal 1988;256(1):307-9.
1988: C A Kipke; Michael A Cusanovich; Gordon Tollin; Roger A Sunde; John H Enemark
Chicken liver sulfite oxidase. Kinetics of reduction by laser-photoreduced flavins and intramolecular electron transfer.
Biochemistry 1988;27(8):2918-26.
1972: John H Enemark; R D Feltham
Stereochemical Control of Valence and Its Application to the Reduction of Coordinated NO and N(2).
Proceedings of the National Academy of Sciences of the United States of America 1972;69(12):3534-6.