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Melvin Okamura

Research Profile

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Rhodobacter sphaeroides

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Thermodynamics

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TOP 3
Marco Flores; Jens Niklas; Melvin Y Okamura; Maria-Eirini Pandelia; Wolfgang Lubitz
Pulse Q-band EPR and ENDOR spectroscopies of the photochemically generated monoprotonated benzosemiquinone radical in frozen alcoholic solution.
Marco Flores; Anton Savitsky; Mark L Paddock; Edward C Abresch; Alexander A Dubinskii; Melvin Y Okamura; Wolfgang Lubitz; Klaus Möbius
Electron-nuclear and electron-electron double resonance spectroscopies show that the primary quinone acceptor QA in reaction centers from photosynthetic bacteria Rhodobacter sphaeroides remains in the same orientation upon light-induced reduction.
Edward C Abresch; Xiao-Min Gong; Mark L Paddock; Melvin Y Okamura
Electron transfer from cytochrome c(2) to the reaction center: a transition state model for ionic strength effects due to neutral mutations.

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All Publications

2012: Marco Flores; Jens Niklas; Melvin Y Okamura; Maria-Eirini Pandelia; Wolfgang Lubitz
Pulse Q-band EPR and ENDOR spectroscopies of the photochemically generated monoprotonated benzosemiquinone radical in frozen alcoholic solution.
The journal of physical chemistry. B 2012;116(30):8890-900.
2010: Marco Flores; Anton Savitsky; Mark L Paddock; Edward C Abresch; Alexander A Dubinskii; Melvin Y Okamura; Wolfgang Lubitz; Klaus Möbius
Electron-nuclear and electron-electron double resonance spectroscopies show that the primary quinone acceptor QA in reaction centers from photosynthetic bacteria Rhodobacter sphaeroides remains in the same orientation upon light-induced reduction.
The journal of physical chemistry. B 2010;114(50):16894-901.
2009: Edward C Abresch; Xiao-Min Gong; Mark L Paddock; Melvin Y Okamura
Electron transfer from cytochrome c(2) to the reaction center: a transition state model for ionic strength effects due to neutral mutations.
Biochemistry 2009;48(48):11390-8.
2009: Tatsuya Iwata; Mark L Paddock; Melvin Y Okamura; Hideki Kandori
Identification of FTIR bands due to internal water molecules around the quinone binding sites in the reaction center from Rhodobacter sphaeroides.
Biochemistry 2009;48(6):1220-9.
2008: Edward C Abresch; Mark L Paddock; Miguel Villalobos; C Chang; Melvin Y Okamura
Interaction between cytochrome c2 and the photosynthetic reaction center from Rhodobacter sphaeroides: role of interprotein hydrogen bonds in binding and electron transfer.
Biochemistry 2008;47(50):13318-25.
2007: Mark L Paddock; M Flores; Roger A Isaacson; C Chang; Edward C Abresch; Melvin Y Okamura
ENDOR spectroscopy reveals light induced movement of the H-bond from Ser-L223 upon forming the semiquinone (Q(B)(-)(*)) in reaction centers from Rhodobacter sphaeroides.
Biochemistry 2007;46(28):8234-43.
2007: Eliane Nabedryk; Mark L Paddock; Melvin Y Okamura; Jacques Breton
Monitoring the pH dependence of IR carboxylic acid signals upon Q(B)- formation in the Glu-L212 --> Asp/Asp-L213 --> Glu swap mutant reaction center from Rhodobacter sphaeroides.
Biochemistry 2007;46(5):1176-82.
2006: Mark L Paddock; M Flores; Roger A Isaacson; C Chang; Edward C Abresch; P Selvaduray; Melvin Y Okamura
Trapped conformational states of semiquinone (D+*QB-*) formed by B-branch electron transfer at low temperature in Rhodobacter sphaeroides reaction centers.
Biochemistry 2006;45(47):14032-42.
2005: Eliane Nabedryk; Mark L Paddock; Melvin Y Okamura; Jacques Breton
An isotope-edited FTIR investigation of the role of Ser-L223 in binding quinone (QB) and semiquinone (QB-) in the reaction center from Rhodobacter sphaeroides.
Biochemistry 2005;44(44):14519-27.
2005: Mark L Paddock; K H Weber; C Chang; Melvin Y Okamura
Interactions between cytochrome c2 and the photosynthetic reaction center from Rhodobacter sphaeroides: the cation-pi interaction.
Biochemistry 2005;44(28):9619-25.
2005: Mark L Paddock; C Chang; Q Xu; Edward C Abresch; Herbert L Axelrod; George Feher; Melvin Y Okamura
Quinone (QB) reduction by B-branch electron transfer in mutant bacterial reaction centers from Rhodobacter sphaeroides: quantum efficiency and X-ray structure.
Biochemistry 2005;44(18):6920-8.
2005: Osamu Miyashita; Melvin Y Okamura; José N Onuchic
Interprotein electron transfer from cytochrome c2 to photosynthetic reaction center: tunneling across an aqueous interface.
Proceedings of the National Academy of Sciences of the United States of America 2005;102(10):3558-63.
2005: Herbert L Axelrod; Melvin Y Okamura
The structure and function of the cytochrome c2: reaction center electron transfer complex from Rhodobacter sphaeroides.
Photosynthesis research 2005;85(1):101-14.
2004: Osamu Miyashita; José N Onuchic; Melvin Y Okamura
Transition state and encounter complex for fast association of cytochrome c2 with bacterial reaction center.
Proceedings of the National Academy of Sciences of the United States of America 2004;101(46):16174-9.
2004: Eliane Nabedryk; Jacques Breton; Melvin Y Okamura; Mark L Paddock
Identification of a novel protonation pattern for carboxylic acids upon Q(B) photoreduction in Rhodobacter sphaeroides reaction center mutants at Asp-L213 and Glu-L212 sites.
Biochemistry 2004;43(23):7236-43.
2004: Qiang Xu; Herbert L Axelrod; Edward C Abresch; Mark L Paddock; Melvin Y Okamura; George Feher
X-Ray structure determination of three mutants of the bacterial photosynthetic reaction centers from Rb. sphaeroides; altered proton transfer pathways.
Structure (London, England : 1993) 2004;12(4):703-15.
2003: Xiao-Min Gong; Mark L Paddock; Melvin Y Okamura
Interactions between cytochrome c2 and photosynthetic reaction center from Rhodobacter sphaeroides: changes in binding affinity and electron transfer rate due to mutation of interfacial hydrophobic residues are strongly correlated.
Biochemistry 2003;42(49):14492-500.
2003: Mark L Paddock; George Feher; Melvin Y Okamura
Proton transfer pathways and mechanism in bacterial reaction centers.
FEBS letters 2003;555(1):45-50.
2003: Osamu Miyashita; José N Onuchic; Melvin Y Okamura
Continuum electrostatic model for the binding of cytochrome c2 to the photosynthetic reaction center from Rhodobacter sphaeroides.
Biochemistry 2003;42(40):11651-60.
2003: Mark L Paddock; L Sagle; Ali Tehrani; J Thomas Beatty; George Feher; Melvin Y Okamura
Mechanism of proton transfer inhibition by Cd(2+) binding to bacterial reaction centers: determination of the pK(A) of functionally important histidine residues.
Biochemistry 2003;42(32):9626-32.
2002: Mark L Paddock; P Adelroth; George Feher; Melvin Y Okamura; J Thomas Beatty
Determination of proton transfer rates by chemical rescue: application to bacterial reaction centers.
Biochemistry 2002;41(50):14716-25.
2002: Rafael Calvo; Roger A Isaacson; Edward C Abresch; Melvin Y Okamura; George Feher
Spin-lattice relaxation of coupled metal-radical spin-dimers in proteins: application to Fe(2+)-cofactor (Q(A)(-.), Q(B)(-.), phi(-.)) dimers in reaction centers from photosynthetic bacteria.
Biophysical journal 2002;83(5):2440-56.
2002: Herbert L Axelrod; Edward C Abresch; Melvin Y Okamura; Andrew P Yeh; Douglas C Rees; George Feher
X-ray structure determination of the cytochrome c2: reaction center electron transfer complex from Rhodobacter sphaeroides.
Journal of molecular biology 2002;319(2):501-15.
2002: M Tetreault; M Cusanovich; T Meyer; Herbert L Axelrod; Melvin Y Okamura
Double mutant studies identify electrostatic interactions that are important for docking cytochrome c2 onto the bacterial reaction center.
Biochemistry 2002;41(18):5807-15.
2002: Alberto Mezzetti; Eliane Nabedryk; Jacques Breton; Melvin Y Okamura; Mark L Paddock; Giovanni Giacometti; Winfried Leibl
Rapid-scan Fourier transform infrared spectroscopy shows coupling of GLu-L212 protonation and electron transfer to Q(B) in Rhodobacter sphaeroides reaction centers.
Biochimica et biophysica acta 2002;1553(3):320-30.
2001: P Adelroth; Mark L Paddock; Ali Tehrani; J Thomas Beatty; George Feher; Melvin Y Okamura
Identification of the proton pathway in bacterial reaction centers: decrease of proton transfer rate by mutation of surface histidines at H126 and H128 and chemical rescue by imidazole identifies the initial proton donors.
Biochemistry 2001;40(48):14538-46.
2001: Eliane Nabedryk; Jacques Breton; Melvin Y Okamura; Mark L Paddock
Simultaneous replacement of Asp-L210 and Asp-M17 with Asn increases proton uptake by Glu-L212 upon first electron transfer to QB in reaction centers from Rhodobacter sphaeroides.
Biochemistry 2001;40(46):13826-32.
2001: M Tetreault; S H Rongey; George Feher; Melvin Y Okamura
Interaction between cytochrome c2 and the photosynthetic reaction center from Rhodobacter sphaeroides: effects of charge-modifying mutations on binding and electron transfer.
Biochemistry 2001;40(29):8452-62.
2001: Mark L Paddock; P Adelroth; C Chang; Edward C Abresch; George Feher; Melvin Y Okamura
Identification of the proton pathway in bacterial reaction centers: cooperation between Asp-M17 and Asp-L210 facilitates proton transfer to the secondary quinone (QB).
Biochemistry 2001;40(23):6893-902.
2000: P Adelroth; Mark L Paddock; L B Sagle; George Feher; Melvin Y Okamura
Identification of the proton pathway in bacterial reaction centers: both protons associated with reduction of QB to QBH2 share a common entry point.
Proceedings of the National Academy of Sciences of the United States of America 2000;97(24):13086-91.
2000: Melvin Y Okamura; Mark L Paddock; MS Graige; George Feher
Proton and electron transfer in bacterial reaction centers.
Biochimica et biophysica acta 2000;1458(1):148-63.
2000: Mark L Paddock; George Feher; Melvin Y Okamura
Identification of the proton pathway in bacterial reaction centers: replacement of Asp-M17 and Asp-L210 with asn reduces the proton transfer rate in the presence of Cd2+.
Proceedings of the National Academy of Sciences of the United States of America 2000;97(4):1548-53.
2000: Herbert L Axelrod; Edward C Abresch; Mark L Paddock; Melvin Y Okamura; George Feher
Determination of the binding sites of the proton transfer inhibitors Cd2+ and Zn2+ in bacterial reaction centers.
Proceedings of the National Academy of Sciences of the United States of America 2000;97(4):1542-7.
1999: MS Graige; Mark L Paddock; George Feher; Melvin Y Okamura
Observation of the protonated semiquinone intermediate in isolated reaction centers from Rhodobacter sphaeroides: implications for the mechanism of electron and proton transfer in proteins.
Biochemistry 1999;38(35):11465-73.
1999: Mark L Paddock; MS Graige; George Feher; Melvin Y Okamura
Identification of the proton pathway in bacterial reaction centers: inhibition of proton transfer by binding of Zn2+ or Cd2+.
Proceedings of the National Academy of Sciences of the United States of America 1999;96(11):6183-8.
1998: Eliane Nabedryk; Jacques Breton; Melvin Y Okamura; Mark L Paddock
Proton uptake by carboxylic acid groups upon photoreduction of the secondary quinone (QB) in bacterial reaction centers from Rhodobacter sphaeroides: FTIR studies on the effects of replacing Glu H173.
Biochemistry 1998;37(41):14457-62.
1998: MS Graige; George Feher; Melvin Y Okamura
Conformational gating of the electron transfer reaction QA-.QB --> QAQB-. in bacterial reaction centers of Rhodobacter sphaeroides determined by a driving force assay.
Proceedings of the National Academy of Sciences of the United States of America 1998;95(20):11679-84.
1997: Mark L Paddock; George Feher; Melvin Y Okamura
Proton and electron transfer to the secondary quinone (QB) in bacterial reaction centers: the effect of changing the electrostatics in the vicinity of QB by interchanging asp and glu at the L212 and L213 sites.
Biochemistry 1997;36(46):14238-49.
1997: Peter Brzezinski; Mark L Paddock; Melvin Y Okamura; George Feher
Light-induced electrogenic events associated with proton uptake upon forming QB- in bacterial wild-type and mutant reaction centers.
Biochimica et biophysica acta 1997;1321(2):149-56.
1996: N Adir; H L Axelrod; P Beroza; R A Isaacson; S H Rongey; Melvin Y Okamura; George Feher
Co-crystallization and characterization of the photosynthetic reaction center-cytochrome c2 complex from Rhodobacter sphaeroides.
Biochemistry 1996;35(8):2535-47.
1995: Mark L Paddock; George Feher; Melvin Y Okamura
Pathway of proton transfer in bacterial reaction centers: further investigations on the role of Ser-L223 studied by site-directed mutagenesis.
Biochemistry 1995;34(48):15742-50.
1995: Eliane Nabedryk; Jacques Breton; Rainer Hienerwadel; C Fogel; Werner Mäntele; Mark L Paddock; Melvin Y Okamura
Fourier transforms infrared difference spectroscopy of secondary quinone acceptor photoreduction in proton transfer mutants of Rhodobacter sphaeroides.
Biochemistry 1995;34(45):14722-32.
1995: P Beroza; D R Fredkin; Melvin Y Okamura; George Feher
Electrostatic calculations of amino acid titration and electron transfer, Q-AQB-->QAQ-B, in the reaction center.
Biophysical journal 1995;68(6):2233-50.
1995: Rainer Hienerwadel; S Grzybek; C Fogel; W Kreutz; Melvin Y Okamura; Mark L Paddock; Jacques Breton; Eliane Nabedryk; Werner Mäntele
Protonation of Glu L212 following QB- formation in the photosynthetic reaction center of Rhodobacter sphaeroides: evidence from time-resolved infrared spectroscopy.
Biochemistry 1995;34(9):2832-43.
1994: P H McPherson; M Schönfeld; Mark L Paddock; Melvin Y Okamura; George Feher
Protonation and free energy changes associated with formation of QBH2 in native and Glu-L212-->Gln mutant reaction centers from Rhodobacter sphaeroides.
Biochemistry 1994;33(5):1181-93.
1994: Mark L Paddock; S H Rongey; P H McPherson; A Juth; George Feher; Melvin Y Okamura
Pathway of proton transfer in bacterial reaction centers: role of aspartate-L213 in proton transfers associated with reduction of quinoneto dihydroquinone.
Biochemistry 1994;33(3):734-45.
1993: P H McPherson; Melvin Y Okamura; George Feher
Light-induced proton uptake by photosynthetic reaction centers from Rhodobacter sphaeroides R-26.1. II. Protonation of the state DQAQB2-.
Biochimica et biophysica acta 1993;1144(3):309-24.
1993: S H Rongey; Mark L Paddock; George Feher; Melvin Y Okamura
Pathway of proton transfer in bacterial reaction centers: second-site mutation Asn-M44-->Asp restores electron and proton transfer in reaction centers from the photosynthetically deficient Asp-L213-->Asn mutant of Rhodobacter sphaeroides.
Proceedings of the National Academy of Sciences of the United States of America 1993;90(4):1325-9.
1992: Melvin Y Okamura; George Feher
Proton transfer in reaction centers from photosynthetic bacteria.
Annual review of biochemistry 1992;61():861-96.
1991: P Beroza; D R Fredkin; Melvin Y Okamura; George Feher
Protonation of interacting residues in a protein by a Monte Carlo method: application to lysozyme and the photosynthetic reaction center of Rhodobacter sphaeroides.
Proceedings of the National Academy of Sciences of the United States of America 1991;88(13):5804-8.
1990: Mark L Paddock; P H McPherson; George Feher; Melvin Y Okamura
Pathway of proton transfer in bacterial reaction centers: replacement of serine-L223 by alanine inhibits electron and proton transfers associated with reduction of quinone to dihydroquinone.
Proceedings of the National Academy of Sciences of the United States of America 1990;87(17):6803-7.
1990: R Calvo; M C Passeggi; R A Isaacson; Melvin Y Okamura; George Feher
Electron paramagnetic resonance investigation of photosynthetic reaction centers from Rhodobacter sphaeroides R-26 in which Fe2+ was replaced by Cu2+. Determination of hyperfine interactions and exchange and dipole-dipole interactions between Cu2+ and QA-.
Biophysical journal 1990;58(1):149-65.
1989: Wolfgang Lubitz; R A Isaacson; Melvin Y Okamura; E C Abresch; M Plato; George Feher
ENDOR studies of the intermediate electron acceptor radical anion I-. in Photosystem II reaction centers.
Biochimica et biophysica acta 1989;977(2):227-32.
1989: Mark L Paddock; S H Rongey; George Feher; Melvin Y Okamura
Pathway of proton transfer in bacterial reaction centers: replacement of glutamic acid 212 in the L subunit by glutamine inhibits quinone (secondary acceptor) turnover.
Proceedings of the National Academy of Sciences of the United States of America 1989;86(17):6602-6.
1987: Mathias Lösche; George Feher; Melvin Y Okamura
The Stark effect in reaction centers from Rhodobacter sphaeroides R-26 and Rhodopseudomonas viridis.
Proceedings of the National Academy of Sciences of the United States of America 1987;84(21):7537-41.
1986: Melvin Y Okamura; George Feher
Isotope effect on electron transfer in reaction centers from Rhodopseudomonas sphaeroides.
Proceedings of the National Academy of Sciences of the United States of America 1986;83(21):8152-6.
1986: R J Debus; George Feher; Melvin Y Okamura
Iron-depleted reaction centers from Rhodopseudomonas sphaeroides R-26.1: characterization and reconstitution with Fe2+, Mn2+, Co2+, Ni2+, Cu2+, and Zn2+.
Biochemistry 1986;25(8):2276-87.
1985: D Kleinfeld; Melvin Y Okamura; George Feher
Charge recombination kinetics as a probe of protonation of the primary acceptor in photosynthetic reaction centers.
Biophysical journal 1985;48(5):849-52.
1985: Wolfgang Lubitz; E C Abresch; R J Debus; R A Isaacson; Melvin Y Okamura; George Feher
Electron nuclear double resonance of semiquinones in reaction centers of Rhodopseudomonas sphaeroides.
Biochimica et biophysica acta 1985;808(3):464-9.
1985: A Gopher; Y Blatt; M Schönfeld; Melvin Y Okamura; George Feher; M Montal
The effect of an applied electric field on the charge recombination kinetics in reaction centers reconstituted in planar lipid bilayers.
Biophysical journal 1985;48(2):311-20.
1984: D Kleinfeld; Melvin Y Okamura; George Feher
Electron-transfer kinetics in photosynthetic reaction centers cooled to cryogenic temperatures in the charge-separated state: evidence for light-induced structural changes.
Biochemistry 1984;23(24):5780-6.
1984: D Kleinfeld; Melvin Y Okamura; George Feher
Electron transfer in reaction centers of Rhodopseudomonas sphaeroides. I. Determination of the charge recombination pathway of D+QAQ(-)B and free energy and kinetic relations between Q(-)AQB and QAQ(-)B.
Biochimica et biophysica acta 1984;766(1):126-40.
1984: W F Butler; R Calvo; D R Fredkin; R A Isaacson; Melvin Y Okamura; George Feher
The electronic structure of Fe2+ in reaction centers from Rhodopseudomonas sphaeroides. III. EPR measurements of the reduced acceptor complex.
Biophysical journal 1984;45(5):947-73.
1983: D Rosen; Melvin Y Okamura; E C Abresch; G E Valkirs; George Feher
Interaction of cytochrome c with reaction centers of Rhodopseudomonas sphaeroides R-26: localization of the binding site by chemical cross-linking and immunochemical studies.
Biochemistry 1983;22(2):335-41.
1982: P Eisenberger; Melvin Y Okamura; George Feher
The electronic structure of Fe2+ in reaction centers from Rhodopseudomonas sphaeroides. II. Extended x-ray fine structure studies.
Biophysical journal 1982;37(2):523-38.
1980: D Rosen; Melvin Y Okamura; George Feher
Interaction of cytochrome c with reaction centers of Rhodopseudomonas sphaeroides R-26: determination of number of binding sites and dissociation constants by equilibrium dialysis.
Biochemistry 1980;19(25):5687-92.
1980: W F Butler; D C Johnston; H B Shore; D R Fredkin; Melvin Y Okamura; George Feher
The electronic structure of Fe2+ in reaction centers from Rhodopseudomonas sphaeroides. I. Static magnetization measurements.
Biophysical journal 1980;32(3):967-92.