[NMR paper] NMR reveals double occupancy of quinone-type ligands in the catalytic quinone binding site of the Na+-translocating NADH:Quinone oxidoreductase from Vibrio cholerae.
NMR reveals double occupancy of quinone-type ligands in the catalytic quinone binding site of the Na+-translocating NADH:Quinone oxidoreductase from Vibrio cholerae.
Related ArticlesNMR reveals double occupancy of quinone-type ligands in the catalytic quinone binding site of the Na+-translocating NADH:Quinone oxidoreductase from Vibrio cholerae.
Abstract
The sodium ion-translocating NADH:quinone oxidoreductase (Na(+)-NQR) from the pathogen Vibrio cholerae exploits the free energy liberated during oxidation of NADH with ubiquinone to pump sodium ions across the cytoplasmic membrane. The Na(+)-NQR consists of four membrane-bound subunits NqrBCDE and the peripheral NqrF and NqrA subunits. NqrA binds ubiquinone-8 as well as quinones with shorter prenyl chains (ubiquinone-1 and ubiquinone-2). Here we show that the quinone derivative 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB), a known inhibitor of the bc1 and b6f complexes found in mitochondria and chloroplasts, also inhibits quinone reduction by the Na(+)-NQR in a mixed inhibition mode. Tryptophan fluorescence quenching and saturation transfer difference NMR experiments in the presence of Na(+)-NQR inhibitor (DBMIB or 2-n-heptyl-4-hydroxyquinoline N-oxide) indicate that two quinone analog ligands are bound simultaneously by the NqrA subunit with very similar interaction constants as observed with the holoenzyme complex. We conclude that the catalytic site of quinone reduction is located on NqrA. The two ligands bind to an extended binding pocket in direct vicinity to each other as demonstrated by interligand Overhauser effects between ubiquinone-1 and DBMIB or 2-n-heptyl-4-hydroxyquinoline N-oxide, respectively. We propose that a similar spatially close arrangement of the native quinone substrates is also operational in vivo, enhancing the catalytic efficiency during the final electron transfer steps in the Na(+)-NQR.
Solution NMR Structureof Yeast Succinate DehydrogenaseFlavinylation Factor Sdh5 Reveals a Putative Sdh1 Binding Site
Solution NMR Structureof Yeast Succinate DehydrogenaseFlavinylation Factor Sdh5 Reveals a Putative Sdh1 Binding Site
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bichaw/0/bichaw.ahead-of-print/bi301171u/aop/images/medium/bi-2012-01171u_0004.gif
Biochemistry
DOI: 10.1021/bi301171u
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10-20-2012 06:19 AM
Active site dynamics in NADH oxidase from Thermus thermophilus studied by NMR spin relaxation
Active site dynamics in NADH oxidase from Thermus thermophilus studied by NMR spin relaxation
Abstract We have characterized the backbone dynamics of NADH oxidase from Thermus thermophilus (NOX) using a recently-developed suite of NMR experiments designed to isolate exchange broadening, together with 15N R 1, R 1Ï? , and {1H}-15N steady-state NOE relaxation measurements performed at 11.7 and 18.8 T. NOX is a 54 kDa homodimeric enzyme that belongs to a family of structurally homologous flavin reductases and nitroreductases with many potential biotechnology applications. Prior studies...
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09-30-2011 08:01 PM
Solution NMR structure of VF0530 from Vibrio fischeri reveals a nucleic acid-binding function.
Solution NMR structure of VF0530 from Vibrio fischeri reveals a nucleic acid-binding function.
Solution NMR structure of VF0530 from Vibrio fischeri reveals a nucleic acid-binding function.
Proteins. 2011 Oct;79(10):2988-91
Authors: Aramini JM, Rossi P, Fischer M, Xiao R, Acton TB, Montelione GT
Abstract
Protein domain family PF09905 (DUF2132) is a family of small domains of unknown function that are conserved in a wide range of bacteria. Here we describe the solution NMR structure of the 80-residue VF0530 protein from Vibrio fischeri,...
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09-10-2011 06:51 PM
A Solution NMR Study of the Interactions of Oligomannosides and the Anti-HIV-1 2G12 Antibody Reveals Distinct Binding Modes for Branched Ligands*
A Solution NMR Study of the Interactions of Oligomannosides and the Anti-HIV-1 2G12 Antibody Reveals Distinct Binding Modes for Branched Ligands*
A Solution NMR Study of the Interactions of Oligomannosides and the Anti-HIV-1 2G12 Antibody Reveals Distinct Binding Modes for Branched Ligands*
Chemistry. 2011 Feb 1;17(5):1547-1560
Authors: Enríquez-Navas PM, Marradi M, Padro D, Angulo J, Penadés S
The structural and affinity details of the interactions of synthetic oligomannosides, linear (di-, tri-, and tetra-) and branched (penta- and hepta-),...
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01-27-2011 02:52 PM
A Solution NMR Study of the Interactions of Oligomannosides and the Anti-HIV-1 2G12 Antibody Reveals Distinct Binding Modes for Branched Ligands*
A Solution NMR Study of the Interactions of Oligomannosides and the Anti-HIV-1 2G12 Antibody Reveals Distinct Binding Modes for Branched Ligands*
A Solution NMR Study of the Interactions of Oligomannosides and the Anti-HIV-1 2G12 Antibody Reveals Distinct Binding Modes for Branched Ligands*
Chemistry. 2011 Jan 5;
Authors: Enríquez-Navas PM, Marradi M, Padro D, Angulo J, Penadés S
The structural and affinity details of the interactions of synthetic oligomannosides, linear (di-, tri-, and tetra-) and branched (penta- and hepta-), with the broadly...
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01-06-2011 11:21 AM
[NMR paper] Epitope mapping and competitive binding of HSA drug site II ligands by NMR diffusion
Epitope mapping and competitive binding of HSA drug site II ligands by NMR diffusion measurements.
Related Articles Epitope mapping and competitive binding of HSA drug site II ligands by NMR diffusion measurements.
J Am Chem Soc. 2004 Nov 3;126(43):14258-66
Authors: Lucas LH, Price KE, Larive CK
It is important to characterize drug-albumin binding during drug discovery and lead optimization as strong binding may reduce bioavailability and/or increase the drug's in vivo half-life. Despite knowing about the location of human serum albumin (HSA)...
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11-24-2010 10:03 PM
[NMR paper] The roles of active-site residues in the catalytic mechanism of trans-3-chloroacrylic
The roles of active-site residues in the catalytic mechanism of trans-3-chloroacrylic acid dehalogenase: a kinetic, NMR, and mutational analysis.
Related Articles The roles of active-site residues in the catalytic mechanism of trans-3-chloroacrylic acid dehalogenase: a kinetic, NMR, and mutational analysis.
Biochemistry. 2004 Apr 13;43(14):4082-91
Authors: Azurmendi HF, Wang SC, Massiah MA, Poelarends GJ, Whitman CP, Mildvan AS
trans-3-Chloroacrylic acid dehalogenase (CaaD) converts trans-3-chloroacrylic acid to malonate semialdehyde by the...
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11-24-2010 09:51 PM
[NMR paper] The mobile loop region of the NAD(H) binding component (dI) of proton-translocating n
The mobile loop region of the NAD(H) binding component (dI) of proton-translocating nicotinamide nucleotide transhydrogenase from Rhodospirillum rubrum: complete NMR assignment and effects of bound nucleotides.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles The mobile loop region of the NAD(H) binding component (dI) of proton-translocating nicotinamide nucleotide transhydrogenase from Rhodospirillum rubrum: complete NMR assignment and effects of bound nucleotides.
Biochim Biophys Acta. 1999...