551
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Meiler J, Blomberg N, Nilges M, Griesinger C. A new approach for applying residual dipolar couplings as restraints in structure elucidation. JOURNAL OF BIOMOLECULAR NMR 2000; 16:245-252. [PMID: 10805131 DOI: 10.1023/a:1008378624590] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Residual dipolar couplings are useful global structural restraints. The dipolar couplings define the orientation of a vector with respect to the alignment tensor. Although the size of the alignment tensor can be derived from the distribution of the experimental dipolar couplings, its orientation with respect to the coordinate system of the molecule is unknown at the beginning of structure determination. This causes convergence problems in the simulated annealing process. We therefore propose a protocol that translates dipolar couplings into intervector projection angles, which are independent of the orientation of the alignment tensor with respect to the molecule. These restraints can be used during the whole simulated annealing protocol.
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Affiliation(s)
- J Meiler
- Universität Frankfurt, Institut für Organische Chemie, Frankfurt am Main, Germany
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552
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Firestone MA, Tiede DM, Seifert S. Magnetic Field-Induced Ordering of a Polymer-Grafted Biomembrane−Mimetic Hydrogel. J Phys Chem B 2000. [DOI: 10.1021/jp993591s] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Millicent A. Firestone
- Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
| | - David M. Tiede
- Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
| | - Sönke Seifert
- Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
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553
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Kontaxis G, Clore GM, Bax A. Evaluation of cross-correlation effects and measurement of one-bond couplings in proteins with short transverse relaxation times. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2000; 143:184-196. [PMID: 10698659 DOI: 10.1006/jmre.1999.1979] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Various strategies are described and compared for measurement of one-bond J(NH) and J(NC') splittings in larger proteins. In order to evaluate the inherent resolution obtainable in the various experiments, relaxation rates of (15)N-(1)H(N) coupled and heteronuclear decoupled resonances were measured at 600- and 800-MHz field strengths for both perdeuterated and protonated proteins. A comparison of decay rates for the two (15)N-¿H(N)¿ doublet components shows average ratios of 4.8 and 3.5 at 800- and 600-MHz (1)H frequency, respectively, in the perdeuterated proteins. For the protonated proteins these ratios are 3.2 (800 MHz) and 2.4 (600 MHz). Relative to the regular HSQC experiment, the enhancement in TROSY (15)N resolution is 2.6 (perdeuterated; 800 MHz), 2.0 (perdeuterated; 600 MHz), 2.1 (protonated; 800 MHz), and 1.7 (protonated; 600 MHz). For the (1)H dimension, the upfield (1)H(N)-¿(15)N¿ component on average relaxes slower than the downfield (1)H(N)-¿(15)N¿ component by a factor of 1.8 (perdeuterated; 800 MHz) and 1.6 (perdeuterated; 600 MHz). The poor resolution for the upfield (15)N-¿(1)H¿ doublet component in slowly tumbling proteins makes it advantageous to derive the J(NH) splitting from the difference in frequency between the narrow downfield (15)N doublet component and either the (1)H-decoupled (15)N resonance or the peak position in an experiment which J-scales the frequency of the upfield doublet component but maintains some of the advantages of the TROSY experiment.
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Affiliation(s)
- G Kontaxis
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892-0520, USA
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554
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Déméné H, Tsan P, Gans P, Marion D. NMR Determination of the Magnetic Susceptibility Anisotropy of Cytochrome c‘ of Rhodobacter Capsulatus by 1JHN Dipolar Coupling Constants Measurement: Characterization of Its Monomeric State in Solution. J Phys Chem B 2000. [DOI: 10.1021/jp994318t] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hélène Déméné
- Laboratoire de Résonance Magnétique Nucléaire, Institut de Biologie Structurale “Jean Pierre Ebel” (CEA-CNRS), 41 Rue Jules Horowitz, 38027 Grenoble Cedex, France
| | - Pascale Tsan
- Laboratoire de Résonance Magnétique Nucléaire, Institut de Biologie Structurale “Jean Pierre Ebel” (CEA-CNRS), 41 Rue Jules Horowitz, 38027 Grenoble Cedex, France
| | - Pierre Gans
- Laboratoire de Résonance Magnétique Nucléaire, Institut de Biologie Structurale “Jean Pierre Ebel” (CEA-CNRS), 41 Rue Jules Horowitz, 38027 Grenoble Cedex, France
| | - Dominique Marion
- Laboratoire de Résonance Magnétique Nucléaire, Institut de Biologie Structurale “Jean Pierre Ebel” (CEA-CNRS), 41 Rue Jules Horowitz, 38027 Grenoble Cedex, France
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555
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Delaglio F, Kontaxis G, Bax A. Protein Structure Determination Using Molecular Fragment Replacement and NMR Dipolar Couplings. J Am Chem Soc 2000. [DOI: 10.1021/ja993603n] [Citation(s) in RCA: 184] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Frank Delaglio
- Laboratory of Chemical Physics National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health Bethesda, Maryland 20892
| | - Georg Kontaxis
- Laboratory of Chemical Physics National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health Bethesda, Maryland 20892
| | - Ad Bax
- Laboratory of Chemical Physics National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health Bethesda, Maryland 20892
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556
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Skrynnikov NR, Goto NK, Yang D, Choy WY, Tolman JR, Mueller GA, Kay LE. Orienting domains in proteins using dipolar couplings measured by liquid-state NMR: differences in solution and crystal forms of maltodextrin binding protein loaded with beta-cyclodextrin. J Mol Biol 2000; 295:1265-73. [PMID: 10653702 DOI: 10.1006/jmbi.1999.3430] [Citation(s) in RCA: 166] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Protein function is often regulated by conformational changes that occur in response to ligand binding or covalent modification such as phosphorylation. In many multidomain proteins these conformational changes involve reorientation of domains within the protein. Although X-ray crystallography can be used to determine the relative orientation of domains, the crystal-state conformation can reflect the effect of crystal packing forces and therefore may differ from the physiologically relevant form existing in solution. Here we demonstrate that the solution-state conformation of a multidomain protein can be obtained from its X-ray structure using an extensive set of dipolar couplings measured by triple-resonance multidimensional NMR spectroscopy in weakly aligning solvent. The solution-state conformation of the 370-residue maltodextrin-binding protein (MBP) loaded with beta-cyclodextrin has been determined on the basis of one-bond (15)N-H(N), (15)N-(13)C', (13)C(alpha)-(13)C', two-bond (13)C'-H(N), and three-bond (13)C(alpha)-H(N) dipolar couplings measured for 280, 262, 276, 262, and 276 residues, respectively. This conformation was generated by applying hinge rotations to various X-ray structures of MBP seeking to minimize the difference between the experimentally measured and calculated dipolar couplings. Consistent structures have been derived in this manner starting from four different crystal forms of MBP. The analysis has revealed substantial differences between the resulting solution-state conformation and its crystal-state counterpart (Protein Data Bank accession code 1DMB) with the solution structure characterized by an 11(+/-1) degrees domain closure. We have demonstrated that the precision achieved in these analyses is most likely limited by small uncertainties in the intradomain structure of the protein (ca 5 degrees uncertainty in orientation of internuclear vectors within domains). In addition, potential effects of interdomain motion have been considered using a number of different models and it was found that the structures derived on the basis of dipolar couplings accurately represent the effective average conformation of the protein.
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Affiliation(s)
- N R Skrynnikov
- Contribution Protein Engineering Network Centres of Excellence and Department of Medical Genetics, University of Toronto, Toronto, Ontario, M5S 1A8, Canada.
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557
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Koenig BW, Mitchell DC, König S, Grzesiek S, Litman BJ, Bax A. Measurement of dipolar couplings in a transducin peptide fragment weakly bound to oriented photo-activated rhodopsin. JOURNAL OF BIOMOLECULAR NMR 2000; 16:121-125. [PMID: 10723991 DOI: 10.1023/a:1008378523816] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Rhodopsin-containing disks, isolated from rod outer segments of bovine retina, align at high magnetic fields with their membrane normal parallel to the magnetic field. After light-activation of rhodopsin, transient binding of the C-terminal transducin undecapeptide, selectively labeled with 15N at Leu5 and Gly9, results in residual dipolar contributions to the 1J(NH) splittings for these two residues. Both residues show 1J(NH) splittings which are smaller than in the dark-adapted or rhodopsin-free sample, and return to their isotropic values at a rate determined by the decay of the meta II state of rhodopsin. The dipolar couplings indicate that in the bound state, N-H vectors of Leu5 and Gly9 make angles of 48+/-4 degrees and 40+/-8 degrees, respectively, with the disk normal. These 'transferred' dipolar couplings potentially offer a useful method for studying the conformation and orientation of flexible, low affinity ligands when bound to oriented integral membrane receptors.
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Affiliation(s)
- B W Koenig
- Laboratory of Chemical Physics, NIDDK, National Institutes of Health, Bethesda, MD 20892-0520, USA
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558
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Al-Hashimi HM, Bolon PJ, Prestegard JH. Molecular symmetry as an aid to geometry determination in ligand protein complexes. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2000; 142:153-158. [PMID: 10617446 DOI: 10.1006/jmre.1999.1937] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Dipole-dipole couplings between pairs of spin 12 nuclei, which can be measured from NMR spectra in field-ordered media, offer useful constraints on the orientation of various fragments in molecular systems. However, the orientation of fragments relative to a molecule fixed reference frame is often key to complete structure determination. Here, we demonstrate that the symmetry properties of molecular complexes can aid in the definition of a reference frame. It is shown that a threefold rotational symmetry axis dictates the direction and symmetry of the experimentally determined order tensor for alpha-methyl-mannose in fast exchange among the three symmetry-related binding sites of mannose binding protein. This approach facilitates studies of the geometry of the ligand in the protein-ligand complex and also may provide a novel route to structure determination of a homomultimeric protein.
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Affiliation(s)
- H M Al-Hashimi
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, USA
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559
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Prosser RS, Shiyanovskaya IV. Lanthanide ion assisted magnetic alignment of model membranes and macromolecules. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/1099-0534(2001)13:1<19::aid-cmr3>3.0.co;2-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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560
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Vander Kooi CW, Kupce E, Zuiderweg ER, Pellecchia M. Line narrowing in spectra of proteins dissolved in a dilute liquid crystalline phase by band-selective adiabatic decoupling: application to 1HN-15N residual dipolar coupling measurements. JOURNAL OF BIOMOLECULAR NMR 1999; 15:335-338. [PMID: 10685341 DOI: 10.1023/a:1008387305293] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Residual heteronuclear dipolar couplings obtained from partially oriented protein samples can provide unique NMR constraints for protein structure determination. However, partial orientation of protein samples also causes severe 1H line broadening resulting from residual 1H-1H dipolar couplings. In this communication we show that band-selective 1H homonuclear decoupling during data acquisition is an efficient way to suppress residual 1H-1H dipolar couplings, resulting in spectra that are still amenable to solution NMR analysis, even with high degrees of alignment. As an example, we present a novel experiment with improved sensitivity for the measurement of one-bond 1HN-15N residual dipolar couplings in a protein sample dissolved in magnetically aligned liquid crystalline bicelles.
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Affiliation(s)
- C W Vander Kooi
- Department of Chemistry, University of Michigan, Ann Arbor 48109, USA
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561
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Aitio H, Annila A, Heikkinen S, Thulin E, Drakenberg T, Kilpeläinen I. NMR assignments, secondary structure, and global fold of calerythrin, an EF-hand calcium-binding protein from Saccharopolyspora erythraea. Protein Sci 1999; 8:2580-8. [PMID: 10631973 PMCID: PMC2144237 DOI: 10.1110/ps.8.12.2580] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Calerythrin is a 20 kDa calcium-binding protein isolated from gram-positive bacterium Saccharopolyspora erythraea. Based on amino acid sequence homology, it has been suggested that calerythrin belongs to the family of invertebrate sarcoplasmic EF-hand calcium-binding proteins (SCPs), and therefore it is expected to function as a calcium buffer. NMR spectroscopy was used to obtain structural information on the protein in solution. Backbone and side chain 1H, 13C, and 15N assignments were obtained from triple resonance experiments HNCACB, HN(CO)CACB, HNCO, CC(CO)NH, and [15N]-edited TOCSY, and HCCH-TOCSY. Secondary structure was determined by using secondary chemical shifts and characteristic NOEs. In addition, backbone N-H residual dipolar couplings were measured from a spin-state selective [1H, 15N] correlation spectrum acquired from a sample dissolved in a dilute liquid crystal. Four EF-hand motifs with characteristic helix-loop-helix patterns were observed. Three of these are typical calcium-binding EF-hands, whereas site 2 is an atypical nonbinding site. The global fold of calerythrin was assessed by dipolar couplings. Measured dipolar couplings were compared with values calculated from four crystal structures of proteins with sequence homology to calerythrin. These data allowed us to recognize an overall similarity between the folds of calerythrin and sarcoplasmic calcium-binding proteins from the sandworm Nereis diversicolor and the amphioxus Branchiostoma lanceolatum.
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Affiliation(s)
- H Aitio
- Institute of Biotechnology/NMR Laboratory, University of Helsinki, Finland
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562
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Biekofsky RR, Muskett FW, Schmidt JM, Martin SR, Browne JP, Bayley PM, Feeney J. NMR approaches for monitoring domain orientations in calcium-binding proteins in solution using partial replacement of Ca2+ by Tb3+. FEBS Lett 1999; 460:519-26. [PMID: 10556528 DOI: 10.1016/s0014-5793(99)01410-6] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This work shows that the partial replacement of diamagnetic Ca2+ by paramagnetic Tb3+ in Ca2+/calmodulin systems in solution allows the measurement of interdomain NMR pseudocontact shifts and leads to magnetic alignment of the molecule such that significant residual dipolar couplings can be measured. Both these parameters can be used to provide structural information. Species in which Tb3+ ions are bound to only one domain of calmodulin (the N-domain) and Ca2+ ions to the other (the C-domain) provide convenient systems for measuring these parameters. The nuclei in the C-domain experience the local magnetic field induced by the paramagnetic Tb3+ ions bound to the other domain at distances of over 40 A from the Tb3+ ion, shifting the resonances for these nuclei. In addition, the Tb3+ ions bound to the N-domain of calmodulin greatly enhance the magnetic susceptibility anisotropy of the molecule so that a certain degree of alignment is produced due to interaction with the external magnetic field. In this way, dipolar couplings between nuclear spins are not averaged to zero due to solution molecular tumbling and yield dipolar coupling contributions to, for example, the one-bond 15N-1H splittings of up to 17 Hz in magnitude. The degree of alignment of the C-domain will also depend on the degree of orientational freedom of this domain with respect to the N-domain containing the Tb3+ ions. Pseudocontact shifts for NH groups and 1H-15N residual dipolar couplings for the directly bonded atoms have been measured for calmodulin itself, where the domains have orientational freedom, and for the complex of calmodulin with a target peptide from skeletal muscle myosin light chain kinase, where the domains have fixed orientations with respect to each other. The simultaneous measurements of these parameters for systems with domains in fixed orientations show great potential for the determination of the relative orientation of the domains.
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Affiliation(s)
- R R Biekofsky
- Molecular Structure Division, National Institute for Medical Research, The Ridgeway, Mill Hill, London, UK
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563
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Permi P, Sorsa T, Kilpelainen I, Annila A. HN(alpha/beta-COCA-J) experiment for measurement of (1)J(C'C(alpha)) couplings from two-dimensional. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 141:44-51. [PMID: 10527742 DOI: 10.1006/jmre.1999.1886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Anew method for measurement of one-bond (13)C'-(13)C(alpha) scalar and dipolar couplings from a two-dimensional [(15)N, (1)H] correlation spectrum is presented. The experiment is based on multiple-quantum coherence, which is created between nitrogen and carbonyl carbon for simultaneous evolution of (15)N chemical shift and coupling between (13)C' and (13)C(alpha). Optional subspectral editing is provided by the spin-state-selective filters. The residual dipolar dipolar contribution to the (13)C'-(13)C(alpha) coupling can be measured from these simplified [(15)N, (1)H]-HSQC-like spectra. In this way, without explicit knowledge of carbon assignments, conformational changes of proteins dissolved in dilute liquid crystals can be probed conveniently, e.g., in structure activity relationship by NMR studies. The method is demonstrated with human cardiac troponin C. Copyright 1999 Academic Press.
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Affiliation(s)
- P Permi
- Institute of Biotechnology, University of Helsinki, Helsinki, FIN-00014, Finland
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564
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Bolon PJ, Al-Hashimi HM, Prestegard JH. Residual dipolar coupling derived orientational constraints on ligand geometry in a 53 kDa protein-ligand complex. J Mol Biol 1999; 293:107-15. [PMID: 10512719 DOI: 10.1006/jmbi.1999.3133] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The geometric relationships between ligands and the functional groups that bind ligands in soluble ligand-protein complexes have traditionally been deduced from distance constraints between pairs of NMR active nuclei spanning the ligand-protein interface. Frequently, the steep inverse distance dependence of the nuclear Overhauser effect (NOE), from which the distance constraints are derived, makes identification of sufficient numbers of constraints difficult. In these cases the ability to supplement NOE-derived information with distance-independent angular information can be very important. Here, the observation of residual dipolar couplings from alpha-methyl mannose bound to mannose binding-protein in a dilute liquid crystalline medium has allowed the determination of a bound ligand's average orientation. The 3-fold rotational symmetry of mannose-binding protein defines its orientational tensor and obviates the need to determine experimentally the protein's average orientation. Through superimposition of ligand and protein orientational tensors we describe the binding geometry of alpha-methyl mannose bound to mannose-binding protein. This new method is of general applicability to the study of ligands bound to proteins, and it is of particular interest when neither X-ray crystallography nor NOE techniques can provide sufficient information to describe binding geometries.
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Affiliation(s)
- P J Bolon
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602, USA
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565
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Peshkovsky A, McDermott AE. NMR Spectroscopy in the Presence of Strong Ac Electric Fields: Degree of Alignment of Polar Molecules. J Phys Chem A 1999. [DOI: 10.1021/jp991993u] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexey Peshkovsky
- Department of Chemistry, Columbia University, New York, New York 10027
| | - Ann E. McDermott
- Department of Chemistry, Columbia University, New York, New York 10027
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566
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Tian F, Losonczi JA, Fischer MW, Prestegard JH. Sign determination of dipolar couplings in field-oriented bicelles by variable angle sample spinning (VASS). JOURNAL OF BIOMOLECULAR NMR 1999; 15:145-150. [PMID: 10605087 DOI: 10.1023/a:1008356210291] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Residual dipolar couplings are being increasingly used as structural constraints for NMR studies of biomolecules. A problem arises when dipolar coupling contributions are larger than scalar contributions for a given spin pair, as is commonly observed in solid state NMR studies, in that signs of dipolar couplings cannot easily be determined. Here the sign ambiguities of dipolar couplings in field-oriented bicelles are resolved by variable angle sample spinning (VASS) techniques. The director behavior of field-oriented bicelles (DMPC/DHPC, DMPC/CHAPSO) in VASS is studied by 31P NMR. A stable configuration occurs when the spinning angle is smaller than the magic angle, 54.7 degrees, and the director (or bicelle normal) of the disks is mainly distributed in a plane perpendicular to the rotation axis. Since the dipolar couplings depend on how the bicelles are oriented with respect to the magnetic field, it is shown that the dipolar interaction can be scaled to the same order as the J-coupling by moving the spinning axis from 0 degree toward 54.7 degrees. Thus the relative sign of dipolar and scalar couplings can be determined.
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Affiliation(s)
- F Tian
- Complex Carbohydrate Research Center, University of Georgia, Athens 30602-4712, USA
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567
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Wider G, Wüthrich K. NMR spectroscopy of large molecules and multimolecular assemblies in solution. Curr Opin Struct Biol 1999; 9:594-601. [PMID: 10508768 DOI: 10.1016/s0959-440x(99)00011-1] [Citation(s) in RCA: 167] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
New strategies and technical advances in NMR spectroscopy and biochemical methods for isotope labeling have enabled solution NMR studies of biomacromolecular systems of 100 kDa and larger. Recent progress has been made, in particular, with techniques for sequential resonance assignments, novel approaches for the direct observation of hydrogen bonds in nucleic acids and proteins, and segmental isotope labeling.
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Affiliation(s)
- G Wider
- Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Hönggerberg, CH-8093, Zürich, Switzerland
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568
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Case DA. Calculations of NMR dipolar coupling strengths in model peptides. JOURNAL OF BIOMOLECULAR NMR 1999; 15:95-102. [PMID: 10605083 DOI: 10.1023/a:1008349812613] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Ab initio MP2 and density functional quantum chemistry calculations are used to explore geometries and vibrational properties of N-methylacetamide and of the alanine dipeptide with backbone angles characteristic of helix and sheet regions in proteins. The results are used to explore one-bond direct dipolar couplings for the N-H, C alpha-H alpha, C'-N, and C alpha-C' bonds, as well as for the two-bond C'-H interaction. Vibrational averaging affects these dipolar couplings, and these effects can be expressed as effective bond lengths that are 0.5-3% larger than the true bond lengths; bending and torsion vibrations have a bigger influence on the effective coupling than do stretching vibrations. Because of zero-point motion, these effects are important even at low temperature. Hydrogen bonding interactions at the amide group also increase the N-H effective bond length. Although vibrational contributions to effective bond lengths are small, they can have a significant influence on the extraction of order parameters from relaxation data, and a knowledge of relative bond lengths is needed when several types of dipolar couplings are to be simultaneously used for refinement. The present computational results are compared to both solid- and liquid-state NMR experiments. The analysis suggests that secondary structural elements in many proteins may be more rigid than is commonly thought.
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Affiliation(s)
- D A Case
- Department of Molecular Biology, Scripps Research Institute, La Jolla, CA 92037, USA.
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569
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Markus MA, Gerstner RB, Draper DE, Torchia DA. Refining the overall structure and subdomain orientation of ribosomal protein S4 delta41 with dipolar couplings measured by NMR in uniaxial liquid crystalline phases. J Mol Biol 1999; 292:375-87. [PMID: 10493882 DOI: 10.1006/jmbi.1999.3061] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Prokaryotic protein S4 initiates assembly of the small ribosomal subunit by binding to 16 S rRNA. Residues 43-200 of S4 from Bacillus stearothermophilus (S4 Delta41) bind to both 16 S rRNA and to a mRNA pseudoknot. In order to obtain structure-based insights regarding RNA binding, we previously determined the solution structure of S4 Delta41 using NOE, hydrogen bond, and torsion angle restraints. S4 Delta41 is elongated, with two distinct subdomains, one all helical, the other including a beta-sheet. In contrast to the high resolution structures obtained for each individual subdomain, their relative orientation was not precisely defined because only 17 intersubdomain NOE restraints were determined. Compared to the 1.7 A crystal structure, when the sheet-containing subdomains are superimposed, the helical subdomain is twisted by almost 45 degrees about the long axis of the molecule in the solution structure. Because variations in subdomain orientation may explain how the protein recognizes multiple RNA targets, our current goal is to determine the orientation of the subdomains in solution with high precision. To this end, NOE assignments were re-examined. NOESY experiments on a specifically labeled sample revealed that one of the intersubdomain restraints had been misassigned. However, the revised set of NOE restraints produces solution structures that still have imprecisely defined subdomain orientations and that lie between the original NMR structure and the crystal structure. In contrast, augmenting the NOE restraints with N-H dipolar couplings, measured in uniaxial liquid crystalline phases, clearly establishes the relative orientation of the subdomains. Data obtained from two independent liquid crystalline milieux, DMPC/DHPC bicelles and the filamentous bacteriophage Pf1, show that the relative orientation of the subdomains in solution is quite similar to the subdomain orientation in the crystal structure. The solution structure, refined with dipolar data, is presented and its implications for S4's RNA binding activity are discussed.
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Affiliation(s)
- M A Markus
- Molecular Structural Biology Unit, National Institute of Dental and Craniofacial Research, 30 Convent Drive, Bethesda, Room 106, MD 20892-4310, USA
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570
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Olejniczak ET, Meadows RP, Wang H, Cai M, Nettesheim DG, Fesik SW. Improved NMR Structures of Protein/Ligand Complexes Using Residual Dipolar Couplings. J Am Chem Soc 1999. [DOI: 10.1021/ja992139j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Edward T. Olejniczak
- Pharmaceutical Discovery Division Abbott Laboratories, Abbott Park, Illinois 60064
| | - Robert P. Meadows
- Pharmaceutical Discovery Division Abbott Laboratories, Abbott Park, Illinois 60064
| | - Hong Wang
- Pharmaceutical Discovery Division Abbott Laboratories, Abbott Park, Illinois 60064
| | - Mengli Cai
- Pharmaceutical Discovery Division Abbott Laboratories, Abbott Park, Illinois 60064
| | - David G. Nettesheim
- Pharmaceutical Discovery Division Abbott Laboratories, Abbott Park, Illinois 60064
| | - Stephen W. Fesik
- Pharmaceutical Discovery Division Abbott Laboratories, Abbott Park, Illinois 60064
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571
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Tjandra N. Establishing a degree of order: obtaining high-resolution NMR structures from molecular alignment. Structure 1999; 7:R205-11. [PMID: 10610262 DOI: 10.1016/s0969-2126(99)80167-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- N Tjandra
- Laboratory of Biophysical Chemistry, National Heart, Lung, and Blood Institute, NationalInstitutes of Health, Bethesda, MD 20892-0380, USA.
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572
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Contreras MÀ, Ubach J, Millet Ò, Rizo J, Pons M. Measurement of One Bond Dipolar Couplings through Lanthanide-Induced Orientation of a Calcium-Binding Protein. J Am Chem Soc 1999. [DOI: 10.1021/ja990566r] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Miquel Àngel Contreras
- Departament de Química Orgànica, Universitat de Barcelona Martí i Franquès, 1-11, 08028-Barcelona, Spain, and Departments of Biochemistry and Pharmacology The University of Texas Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, Texas 75235
| | - Josep Ubach
- Departament de Química Orgànica, Universitat de Barcelona Martí i Franquès, 1-11, 08028-Barcelona, Spain, and Departments of Biochemistry and Pharmacology The University of Texas Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, Texas 75235
| | - Òscar Millet
- Departament de Química Orgànica, Universitat de Barcelona Martí i Franquès, 1-11, 08028-Barcelona, Spain, and Departments of Biochemistry and Pharmacology The University of Texas Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, Texas 75235
| | - Josep Rizo
- Departament de Química Orgànica, Universitat de Barcelona Martí i Franquès, 1-11, 08028-Barcelona, Spain, and Departments of Biochemistry and Pharmacology The University of Texas Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, Texas 75235
| | - Miquel Pons
- Departament de Química Orgànica, Universitat de Barcelona Martí i Franquès, 1-11, 08028-Barcelona, Spain, and Departments of Biochemistry and Pharmacology The University of Texas Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, Texas 75235
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573
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Moltke S, Grzesiek S. Structural constraints from residual tensorial couplings in high resolution NMR without an explicit term for the alignment tensor. JOURNAL OF BIOMOLECULAR NMR 1999; 15:77-82. [PMID: 20703963 DOI: 10.1023/a:1008309630377] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Structural restraints from residual tensorial couplings in high resolution NMR are usually incorporated into molecular structure calculation programs by an energy penalty function which depends on the knowledge of the alignment tensor. Here, we show that the alignment tensor enters in linear form into such a function. Therefore, the explicit appearance of the alignment tensor can be eliminated from the penalty function. This avoids the necessity of a determination of magnitude and rhombicity of the alignment tensor in the absence of structural information. The price for this procedure is a slightly shallower energy landscape. Simulations in the vicinity of the energy minimum for the backbone of human ubiquitin show that the reduction in curvature is on the order of a few percent.
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Affiliation(s)
- S Moltke
- Institute of Physical Biology, Heinrich-Heine-Universität, D-40225, Düsseldorf, Germany
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574
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Lerche MH, Meissner A, Poulsen FM, Sørensen OW. Pulse sequences for measurement of one-bond (15)N-(1)H coupling constants in the protein backbone. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 140:259-263. [PMID: 10479570 DOI: 10.1006/jmre.1999.1820] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A set of three improved two-dimensional (2D) NMR methods for measuring one-bond (15)N-(1)H coupling constants in the protein backbone is presented. They are tailored to suit the size of the TROSY effect, i.e., the degree of interference between dipolar and chemical shift anisotropy relaxation mechanisms. The methods edit 2D spectra into two separate subspectra corresponding to the two possible spin states of the coupling partner. Cross talk between the two subspectra is a second order effect in the difference between the actual coupling constants and the one used in setting the pertinent delays of the pulse sequences. This relatively high degree of editing accuracy makes the methods useful for applications to molecules subjected to weak alignment where the one-bond coupling constants are linear combinations of a scalar J and a residual dipolar contribution containing important structural information. A demonstration of the new methods is shown for the (15)N-labeled protein chymotrypsin inhibitor 2 in a lipid bicelle mixture.
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Affiliation(s)
- M H Lerche
- Department of Chemistry, Carlsberg Laboratory, Gamle Carlsberg Vej 10, Valby, DK-2500, Denmark
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575
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Tian F, Bolon PJ, Prestegard JH. Intensity-Based Measurement of Homonuclear Residual Dipolar Couplings from CT-COSY. J Am Chem Soc 1999. [DOI: 10.1021/ja9910558] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fang Tian
- Complex Carbohydrate Research Center University of Georgia, Athens, Georgia 30602
| | - Pascal J. Bolon
- Complex Carbohydrate Research Center University of Georgia, Athens, Georgia 30602
| | - J. H. Prestegard
- Complex Carbohydrate Research Center University of Georgia, Athens, Georgia 30602
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576
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Boisbouvier J, Gans P, Blackledge M, Brutscher B, Marion D. Long-Range Structural Information in NMR Studies of Paramagnetic Molecules from Electron Spin−Nuclear Spin Cross-Correlated Relaxation. J Am Chem Soc 1999. [DOI: 10.1021/ja991228t] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jérôme Boisbouvier
- Institut de Biologie Structurale-Jean-Pierre Ebel C.N.R.S.-C.E.A., 41, rue Jules Horowitz 38027 Grenoble Cedex, France
| | - Pierre Gans
- Institut de Biologie Structurale-Jean-Pierre Ebel C.N.R.S.-C.E.A., 41, rue Jules Horowitz 38027 Grenoble Cedex, France
| | - Martin Blackledge
- Institut de Biologie Structurale-Jean-Pierre Ebel C.N.R.S.-C.E.A., 41, rue Jules Horowitz 38027 Grenoble Cedex, France
| | - Bernhard Brutscher
- Institut de Biologie Structurale-Jean-Pierre Ebel C.N.R.S.-C.E.A., 41, rue Jules Horowitz 38027 Grenoble Cedex, France
| | - Dominique Marion
- Institut de Biologie Structurale-Jean-Pierre Ebel C.N.R.S.-C.E.A., 41, rue Jules Horowitz 38027 Grenoble Cedex, France
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577
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Cai M, Wang H, Olejniczak ET, Meadows RP, Gunasekera AH, Xu N, Fesik SW. Accurate measurement of H(N)-H(alpha) residual dipolar couplings in proteins. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 139:451-453. [PMID: 10423386 DOI: 10.1006/jmre.1999.1819] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A method for accurately measuring H(N)-H(alpha) residual dipolar couplings is described. Using this technique, both the sign and magnitude of the coupling can be determined easily. Residual dipolar coupling between H(N)(i)-H(alpha)(i) and H(N)(i)-H(alpha)(i-1) were measured for the FK506 binding protein complexed to FK506. The experimental values were in excellent agreement with predictions based on an X-ray crystal structure of the protein/ligand complex, suggesting that these residual dipolar couplings will provide accurate structural constraints for the refinement of protein structures determined by NMR.
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Affiliation(s)
- M Cai
- Pharmaceutical Discovery Division, Abbott Laboratories, Abbott Park, Illinois 60064, USA
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578
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Permi P, Heikkinen S, Kilpeläinen I, Annila A. Measurement of homonuclear (2)J-couplings from spin-state selective double-/zero-quantum two-dimensional NMR spectra. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 139:273-280. [PMID: 10423364 DOI: 10.1006/jmre.1999.1775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
(1)H-detected two-dimensional double-/zero-quantum experiments are described for measurement of homonuclear (2)J(HH)-couplings of NH(2) or CH(2) groups in proteins. These experiments utilize multiple-quantum coherence for determination of the size and the absolute sign of the geminal scalar and dipolar couplings in the presence of broad lines. Spectra are simplified by gradient selection and spin-state selective filters.
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Affiliation(s)
- P Permi
- Institute of Biotechnology, University of Helsinki, Helsinki, FIN-00014, Finland.
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579
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Baber JL, Libutti D, Levens D, Tjandra N. High precision solution structure of the C-terminal KH domain of heterogeneous nuclear ribonucleoprotein K, a c-myc transcription factor. J Mol Biol 1999; 289:949-62. [PMID: 10369774 DOI: 10.1006/jmbi.1999.2818] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Among it's many reported functions, heterogeneous nuclear ribonucleoprotein (hnRNP) K is a transcription factor for the c- myc gene, a proto-oncogene critical for the regulation of cell growth and differentiation. We have determined the solution structure of the Gly26-->Arg mutant of the C-terminal K-homology (KH) domain of hnRNP K by NMR spectroscopy. This is the first structure investigation of hnRNP K. Backbone residual dipolar couplings, which provide information that is fundamentally different from the standard NOE-derived distance restraints, were employed to improve structure quality. An independent assessment of structure quality was achieved by comparing the backbone15N T1/T2ratios to the calculated structures. The C-terminal KH module of hnRNP K (KH3) is revealed to be a three-stranded beta-sheet stacked against three alpha-helices, two of which are nearly parallel to the strands of the beta-sheet. The Gly26-->Arg mutation abolishes single-stranded DNA binding without altering the overall fold of the protein. This provides a clue to possible nucleotide binding sites of KH3. It appears unlikely that the solvent-exposed side of the beta-sheet will be the site of protein-nucleic acid complex formation. This is in contrast to the earlier theme for protein-RNA complexes incorporating proteins structurally similar to KH3. We propose that the surface of KH3 that interacts with nucleic acid is comparable to the region of DNA interaction for the double-stranded DNA-binding domain of bovine papillomavirus-1 E2 that has a three-dimensional fold similar to that of KH3.
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Affiliation(s)
- J L Baber
- National Heart, Lung, and Blood Institute, National Institutes of Health, Building 3, Bethesda, MD, 20892-0380, USA
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580
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Shimizu H, Donohue-Rolfe A, Homans SW. Derivation of the Bound-State Conformation of a Ligand in a Weakly Aligned Ligand−Protein Complex. J Am Chem Soc 1999. [DOI: 10.1021/ja990586t] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroki Shimizu
- School of Biomedical Sciences University of St. Andrews North Haugh, St. Andrews, KY16 9ST U.K. Department of Comparative Medicine Tufts University School of Veterinary Medicine 200 Westboro Road, North Grafton, Massachusetts 01536
| | - Art Donohue-Rolfe
- School of Biomedical Sciences University of St. Andrews North Haugh, St. Andrews, KY16 9ST U.K. Department of Comparative Medicine Tufts University School of Veterinary Medicine 200 Westboro Road, North Grafton, Massachusetts 01536
| | - Steve W. Homans
- School of Biomedical Sciences University of St. Andrews North Haugh, St. Andrews, KY16 9ST U.K. Department of Comparative Medicine Tufts University School of Veterinary Medicine 200 Westboro Road, North Grafton, Massachusetts 01536
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581
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Losonczi JA, Andrec M, Fischer MW, Prestegard JH. Order matrix analysis of residual dipolar couplings using singular value decomposition. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 138:334-342. [PMID: 10341140 DOI: 10.1006/jmre.1999.1754] [Citation(s) in RCA: 423] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The measurement of anisotropic spin interactions, such as residual dipolar couplings, in partially ordered solutions can provide valuable information on biomolecular structure. While the information can be used to refine local structure, it can make a unique contribution in determining the relative orientation of remote parts of molecules, which are locally well structured, but poorly connected based on NOE data. Analysis of dipolar couplings in terms of Saupe order matrices provides a concise description of both orientation and motional properties of locally structured fragments in these cases. This paper demonstrates that by using singular value decomposition as a method for calculating the order matrices, principal frames and order parameters can be determined efficiently, even when a very limited set of experimental data is available. Analysis of 1H-15N dipolar couplings, measured in a two-domain fragment of the barley lectin protein, is used to illustrate the computational method.
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Affiliation(s)
- J A Losonczi
- Complex Carbohydrate Research Center, University of Georgia, 220 Riverbend Rd., Athens, Georgia 30602-4712, USA
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582
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Dahlke Ojennus D, Mitton-Fry RM, Wuttke DS. Induced alignment and measurement of dipolar couplings of an SH2 domain through direct binding with filamentous phage. JOURNAL OF BIOMOLECULAR NMR 1999; 14:175-179. [PMID: 21080256 DOI: 10.1023/a:1008304332574] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Large residual (15)N-(1)H dipolar couplings have been measured in a Src homology II domain aligned at Pf1 bacteriophage concentrations an order of magnitude lower than used for induction of a similar degree of alignment of nucleic acids and highly acidic proteins. An increase in (1) H and (15)N protein linewidths and a decrease in T(2) and T(1)ρ relaxation time constants implicates a binding interaction between the protein and phage as the mechanism of alignment. However, the associated increased linewidth does not preclude the accurate measurement of large dipolar couplings in the aligned protein. A good correlation is observed between measured dipolar couplings and predicted values based on the high resolution NMR structure of the SH2 domain. The observation of binding-induced protein alignment promises to broaden the scope of alignment techniques by extending their applicability to proteins that are able to interact weakly with the alignment medium.
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Affiliation(s)
- D Dahlke Ojennus
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, CO, 80309-0215, U.S.A
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583
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DESVAUX HERVÉ, GOCHIN MIRIAM. Coherence transfer between nuclear spins in paramagnetic systems: effects of nucleus—electron dipole—dipole cross-correlation. Mol Phys 1999. [DOI: 10.1080/00268979909483076] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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584
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Volkman BF, Wilkens SJ, Lee AL, Xia B, Westler WM, Beger R, Markley JL. Redox-Dependent Magnetic Alignment of Clostridium pasteurianum Rubredoxin: Measurement of Magnetic Susceptibility Anisotropy and Prediction of Pseudocontact Shift Contributions. J Am Chem Soc 1999. [DOI: 10.1021/ja990079b] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian F. Volkman
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
| | - Steven J. Wilkens
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
| | - Andrew L. Lee
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
| | - Bin Xia
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
| | - William M. Westler
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
| | - Richard Beger
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
| | - John L. Markley
- Contribution from the National Magnetic Resonance Facility at Madison, Department of Biochemistry, and Graduate Program in Biophysics, University of Wisconsin−Madison, 433 Babcock Drive, Madison, Wisconsin 53706, Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6059, and National Center for Toxicological Research, Jefferson, Arkansas 72079
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585
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Godbout N, Sanders LK, Salzmann R, Havlin RH, Wojdelski M, Oldfield E. Solid-State NMR, Mössbauer, Crystallographic, and Density Functional Theory Investigation of Fe−O2 and Fe−O2 Analogue Metalloporphyrins and Metalloproteins. J Am Chem Soc 1999. [DOI: 10.1021/ja9832820] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nathalie Godbout
- Contribution from the Departments of Chemistry and Biophysics, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801
| | - Lori K. Sanders
- Contribution from the Departments of Chemistry and Biophysics, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801
| | - Renzo Salzmann
- Contribution from the Departments of Chemistry and Biophysics, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801
| | - Robert H. Havlin
- Contribution from the Departments of Chemistry and Biophysics, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801
| | - Mark Wojdelski
- Contribution from the Departments of Chemistry and Biophysics, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801
| | - Eric Oldfield
- Contribution from the Departments of Chemistry and Biophysics, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801
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586
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Drohat AC, Tjandra N, Baldisseri DM, Weber DJ. The use of dipolar couplings for determining the solution structure of rat apo-S100B(betabeta). Protein Sci 1999; 8:800-9. [PMID: 10211826 PMCID: PMC2144316 DOI: 10.1110/ps.8.4.800] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The relative orientations of adjacent structural elements without many well-defined NOE contacts between them are typically poorly defined in NMR structures. For apo-S100B(betabeta) and the structurally homologous protein calcyclin, the solution structures determined by conventional NMR exhibited considerable differences and made it impossible to draw unambiguous conclusions regarding the Ca2+-induced conformational change required for target protein binding. The structure of rat apo-S100B(betabeta) was recalculated using a large number of constraints derived from dipolar couplings that were measured in a dilute liquid crystalline phase. The dipolar couplings orient bond vectors relative to a single-axis system, and thereby remove much of the uncertainty in NOE-based structures. The structure of apo-S100B(betabeta) indicates a minimal change in the first, pseudo-EF-hand Ca2+ binding site, but a large reorientation of helix 3 in the second, classical EF-hand upon Ca2+ binding.
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Affiliation(s)
- A C Drohat
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore 21201, USA
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587
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Cavagnero S, Dyson HJ, Wright PE. Improved low pH bicelle system for orienting macromolecules over a wide temperature range. JOURNAL OF BIOMOLECULAR NMR 1999; 13:387-391. [PMID: 10353198 DOI: 10.1023/a:1008360022444] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We have prepared and characterized a novel bicelle system composed of 1,2-di-O-dodecyl-sn-glycero-3-phosphocholine (DIODPC) and 3-(chloramidopropyl)dimethylammonio-2-hydroxyl-1-propane sulfonate (CHAPSO). At the optimal DIODPC/CHAPSO molar ratio of 4.3:1, this medium becomes magnetically oriented from pH 6.5 down to pH 1.0. Unlike previously reported bicelle preparations, these bicelles are chemically stable at low pH and are capable of inducing protein alignment, as illustrated by the large residual dipolar couplings measured for rusticyanin from Thiobacillus ferrooxidans at pH 2.1. The DIODPC/CHAPSO system is particularly useful for measuring residual dipolar couplings of macromolecules that require very acidic conditions.
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Affiliation(s)
- S Cavagnero
- Department of Molecular Biology MB-2, Scripps Research Institute, La Jolla, CA 92037, USA
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588
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Marino JP, Schwalbe H, Griesinger C. J-Coupling Restraints in RNA Structure Determination. Acc Chem Res 1999. [DOI: 10.1021/ar9600392] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John P. Marino
- Center for Advanced Research in Biotechnology, 9600 Gudelsky Drive, Rockville, Maryland 20850, and Institut für Organische Chemie, Universität Frankfurt, Marie-Curie Strasse 11, Frankfurt/Main D-60439, Germany
| | - Harald Schwalbe
- Center for Advanced Research in Biotechnology, 9600 Gudelsky Drive, Rockville, Maryland 20850, and Institut für Organische Chemie, Universität Frankfurt, Marie-Curie Strasse 11, Frankfurt/Main D-60439, Germany
| | - Christian Griesinger
- Center for Advanced Research in Biotechnology, 9600 Gudelsky Drive, Rockville, Maryland 20850, and Institut für Organische Chemie, Universität Frankfurt, Marie-Curie Strasse 11, Frankfurt/Main D-60439, Germany
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589
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Sass J, Cordier F, Hoffmann A, Rogowski M, Cousin A, Omichinski JG, Löwen H, Grzesiek S. Purple Membrane Induced Alignment of Biological Macromolecules in the Magnetic Field. J Am Chem Soc 1999. [DOI: 10.1021/ja983887w] [Citation(s) in RCA: 193] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jürgen Sass
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Florence Cordier
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Astrid Hoffmann
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Marco Rogowski
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Anne Cousin
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - James G. Omichinski
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Hartmut Löwen
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
| | - Stephan Grzesiek
- Contribution from the Institute of Structural Biology, IBI-2, Forschungszentrum Jülich, 52425 Jülich, Germany, Institute of Physical Biology, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany, and Institute of Theoretical Physics, Heinrich-Heine-Universität, 40225 Düsseldorf, Germany
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590
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Ottiger M, Bax A. Bicelle-based liquid crystals for NMR-measurement of dipolar couplings at acidic and basic pH values. JOURNAL OF BIOMOLECULAR NMR 1999; 13:187-191. [PMID: 10070759 DOI: 10.1023/a:1008395916985] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
It is demonstrated that mixtures of ditetradecyl-phosphatidylcholine or didodecyl-phoshatidylcholine and dihexyl-phosphatidylcholine in water from lyotropic liquid crystalline phases under similar conditions as previously reported for bicelles consisting of dimyristoyl-phosphatidylcholine (DMPC) and dihexanoyl-phosphatidylcholine (DHPC). The carboxy-ester bonds present in DMPC and DHPC are replaced by ether linkages in their alkyl analogs, which prevents acid- or base-catalyzed hydrolysis of these compounds. 15N-1H dipolar couplings measured for ubiquitin over the 2.3-10.4 pH range indicate that this protein retains a backbone conformation which is very similar to its structure at pH 6.5 over this entire range.
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Affiliation(s)
- M Ottiger
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA
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591
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Cordier F, Dingley AJ, Grzesiek S. A doublet-separated sensitivity-enhanced HSQC for the determination of scalar and dipolar one-bond J-couplings. JOURNAL OF BIOMOLECULAR NMR 1999; 13:175-180. [PMID: 10070758 DOI: 10.1023/a:1008301415843] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A simple, sensitivity-enhanced HSQC experiment is described which separates the upfield and downfield components in the indirect dimension into different subspectra. The sequence is similar to the generalized TROSY scheme; however, decoupling of the X-nucleus is used during detection. A detailed analysis of relaxation effects, precision and sensitivity of the method is presented. The approach is demonstrated in a two-dimensional water flip-back 1H-15N HSQC which measures 1JHN splittings in isotropic and oriented samples of ubiquitin and the hepatitis C protease. The results are in excellent agreement with splittings obtained from a conventional 1H-coupled HSQC.
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Affiliation(s)
- F Cordier
- Institute of Structural Biology, Forschungszentrum Jülich, Germany
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592
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Koenig BW, Hu JS, Ottiger M, Bose S, Hendler RW, Bax A. NMR Measurement of Dipolar Couplings in Proteins Aligned by Transient Binding to Purple Membrane Fragments. J Am Chem Soc 1999. [DOI: 10.1021/ja9837856] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bernd W. Koenig
- Laboratory of Chemical Physics, Building 5 National Institute of Diabetes and Digestive and Kidney Diseases Laboratory of Cell Biology, Building 3 National Heart, Lung and Blood Institute National Institutes of Health Bethesda, Maryland 20892-0520
| | - Jin-Shan Hu
- Laboratory of Chemical Physics, Building 5 National Institute of Diabetes and Digestive and Kidney Diseases Laboratory of Cell Biology, Building 3 National Heart, Lung and Blood Institute National Institutes of Health Bethesda, Maryland 20892-0520
| | - Marcel Ottiger
- Laboratory of Chemical Physics, Building 5 National Institute of Diabetes and Digestive and Kidney Diseases Laboratory of Cell Biology, Building 3 National Heart, Lung and Blood Institute National Institutes of Health Bethesda, Maryland 20892-0520
| | - Salil Bose
- Laboratory of Chemical Physics, Building 5 National Institute of Diabetes and Digestive and Kidney Diseases Laboratory of Cell Biology, Building 3 National Heart, Lung and Blood Institute National Institutes of Health Bethesda, Maryland 20892-0520
| | - Richard W. Hendler
- Laboratory of Chemical Physics, Building 5 National Institute of Diabetes and Digestive and Kidney Diseases Laboratory of Cell Biology, Building 3 National Heart, Lung and Blood Institute National Institutes of Health Bethesda, Maryland 20892-0520
| | - Ad Bax
- Laboratory of Chemical Physics, Building 5 National Institute of Diabetes and Digestive and Kidney Diseases Laboratory of Cell Biology, Building 3 National Heart, Lung and Blood Institute National Institutes of Health Bethesda, Maryland 20892-0520
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593
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Nguyen BD, Xia Z, Yeh DC, Vyas K, Deaguero H, La Mar GN. Solution NMR Determination of the Anisotropy and Orientation of the Paramagnetic Susceptibility Tensor as a Function of Temperature for Metmyoglobin Cyanide: Implications for the Population of Excited Electronic States. J Am Chem Soc 1998. [DOI: 10.1021/ja982555o] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bao D. Nguyen
- Contribution from the Department of Chemistry, University of California, Davis, California 95616
| | - Zhicheng Xia
- Contribution from the Department of Chemistry, University of California, Davis, California 95616
| | - Deok Cheon Yeh
- Contribution from the Department of Chemistry, University of California, Davis, California 95616
| | - K. Vyas
- Contribution from the Department of Chemistry, University of California, Davis, California 95616
| | - Helen Deaguero
- Contribution from the Department of Chemistry, University of California, Davis, California 95616
| | - Gerd N. La Mar
- Contribution from the Department of Chemistry, University of California, Davis, California 95616
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594
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Hansen MR, Mueller L, Pardi A. Tunable alignment of macromolecules by filamentous phage yields dipolar coupling interactions. NATURE STRUCTURAL BIOLOGY 1998; 5:1065-74. [PMID: 9846877 DOI: 10.1038/4176] [Citation(s) in RCA: 507] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Dipolar coupling interactions represent an extremely valuable source of long-range distance and angle information that was previously not available for solution structure determinations of macromolecules. This is because observation of these dipolar coupling data requires creating an anisotropic environment for the macromolecule. Here we introduce a new method for generating tunable degrees of alignment of macromolecules by addition of magnetically aligned Pf1 filamentous bacteriophage as a cosolute. This phage-induced alignment technique has been used to study 1H-1H, 1H-13C, and 1H-15N dipolar coupling interactions in a DNA duplex, an RNA hairpin and several proteins including thioredoxin and apo-calmodulin. The phage allow alignment of macromolecules over a wide range of temperature and solution conditions and thus represent a stable versatile method for generating partially aligned macromolecules in solution.
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Affiliation(s)
- M R Hansen
- Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309-0215, USA
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595
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Banci L, Bertini I, Huber JG, Luchinat C, Rosato A. Partial Orientation of Oxidized and Reduced Cytochrome b5 at High Magnetic Fields: Magnetic Susceptibility Anisotropy Contributions and Consequences for Protein Solution Structure Determination. J Am Chem Soc 1998. [DOI: 10.1021/ja981791w] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lucia Banci
- Contribution from the Department of Chemistry, University of Florence, Florence, Italy, and Department of Soil Science and Plant Nutrition, University of Florence, Florence, Italy
| | - Ivano Bertini
- Contribution from the Department of Chemistry, University of Florence, Florence, Italy, and Department of Soil Science and Plant Nutrition, University of Florence, Florence, Italy
| | - J. Gaspard Huber
- Contribution from the Department of Chemistry, University of Florence, Florence, Italy, and Department of Soil Science and Plant Nutrition, University of Florence, Florence, Italy
| | - Claudio Luchinat
- Contribution from the Department of Chemistry, University of Florence, Florence, Italy, and Department of Soil Science and Plant Nutrition, University of Florence, Florence, Italy
| | - Antonio Rosato
- Contribution from the Department of Chemistry, University of Florence, Florence, Italy, and Department of Soil Science and Plant Nutrition, University of Florence, Florence, Italy
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596
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Pervushin K, Ono A, Fernández C, Szyperski T, Kainosho M, Wüthrich K. NMR scalar couplings across Watson-Crick base pair hydrogen bonds in DNA observed by transverse relaxation-optimized spectroscopy. Proc Natl Acad Sci U S A 1998; 95:14147-51. [PMID: 9826668 PMCID: PMC24341 DOI: 10.1073/pnas.95.24.14147] [Citation(s) in RCA: 265] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This paper describes the NMR observation of 15N---15N and 1H---15N scalar couplings across the hydrogen bonds in Watson-Crick base pairs in a DNA duplex, hJNN and hJHN. These couplings represent new parameters of interest for both structural studies of DNA and theoretical investigations into the nature of the hydrogen bonds. Two dimensional [15N,1H]-transverse relaxation-optimized spectroscopy (TROSY) with a 15N-labeled 14-mer DNA duplex was used to measure hJNN, which is in the range 6-7 Hz, and the two-dimensional hJNN-correlation-[15N,1H]-TROSY experiment was used to correlate the chemical shifts of pairs of hydrogen bond-related 15N spins and to observe, for the first time, hJHN scalar couplings, with values in the range 2-3.6 Hz. TROSY-based studies of scalar couplings across hydrogen bonds should be applicable for large molecular sizes, including protein-bound nucleic acids.
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Affiliation(s)
- K Pervushin
- Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule, Hönggerberg CH-8093 Zürich, Switzerland
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597
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Ottiger M, Bax A. Determination of Relative N−HN, N−C‘, Cα−C‘, and Cα−Hα Effective Bond Lengths in a Protein by NMR in a Dilute Liquid Crystalline Phase. J Am Chem Soc 1998. [DOI: 10.1021/ja9826791] [Citation(s) in RCA: 200] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcel Ottiger
- Contribution from the Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520
| | - Ad Bax
- Contribution from the Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520
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598
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Beger RD, Marathias VM, Volkman BF, Bolton PH. Determination of internuclear angles of DNA using paramagnetic-assisted magnetic alignment. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1998; 135:256-259. [PMID: 9799703 DOI: 10.1006/jmre.1998.1527] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Paramagnetic ions have been used to assist the magnetic alignment of DNA. The anisotropy of the binding sites is sufficient to give rise to significant alignment of the DNA with the observed proton-carbon dipolar couplings spanning a 70-Hz range. The dipolar couplings have been used to determine the positions of the axial and rhombic alignment axes. The positions of the alignment axes relative to the positions of the binding sites of the paramagnetic europium ions have also been determined.
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Affiliation(s)
- R D Beger
- Chemistry Department, Wesleyan University, Middletown, Connecticut, 06459, USA
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599
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Prosser RS, Volkov VB, Shiyanovskaya IV. Novel chelate-induced magnetic alignment of biological membranes. Biophys J 1998; 75:2163-9. [PMID: 9788910 PMCID: PMC1299889 DOI: 10.1016/s0006-3495(98)77659-3] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
A phospholipid chelate complexed with ytterbium (DMPE-DTPA:Yb3+) is shown to be readily incorporated into a model membrane system, which may then be aligned in a magnetic field such that the average bilayer normal lies along the field. This so-called positively ordered smectic phase, whose lipids consist of less than 1% DMPE-DTPA:Yb3+, is ideally suited to structural studies of membrane proteins by solid-state NMR, low-angle diffraction, and spectroscopic techniques that require oriented samples. The chelate, 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine diethylenetriaminepentaacetic acid, which strongly binds the lanthanide ions and serves to orient the membrane in a magnetic field, prevents direct lanthanide-protein interactions and significantly reduces paramagnetic shifts and line broadening. Similar low-spin lanthanide chelates may have applications in field-ordered solution NMR studies of water-soluble proteins and in the design of new magnetically aligned liquid crystalline phases.
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Affiliation(s)
- R S Prosser
- Department of Chemistry, Kent State University, Kent, Ohio 44242, USA.
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600
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Hansen MR, Rance M, Pardi A. Observation of Long-Range 1H−1H Distances in Solution by Dipolar Coupling Interactions. J Am Chem Soc 1998. [DOI: 10.1021/ja9829665] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mark R. Hansen
- Department of Chemistry and Biochemistry University of Colorado Boulder, Colorado 80309-0215 Department of Molecular Genetics Biochemistry and Microbiology University of Cincinnati College of Medicine 231 Bethesda Avenue, Cincinnati, Ohio 45267-0524
| | - Mark Rance
- Department of Chemistry and Biochemistry University of Colorado Boulder, Colorado 80309-0215 Department of Molecular Genetics Biochemistry and Microbiology University of Cincinnati College of Medicine 231 Bethesda Avenue, Cincinnati, Ohio 45267-0524
| | - Arthur Pardi
- Department of Chemistry and Biochemistry University of Colorado Boulder, Colorado 80309-0215 Department of Molecular Genetics Biochemistry and Microbiology University of Cincinnati College of Medicine 231 Bethesda Avenue, Cincinnati, Ohio 45267-0524
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