Related ArticlesThe structure and dipole moment of globular proteins in solution and crystalline states: use of NMR and X-ray databases for the numerical calculation of dipole moment.
Biopolymers. 2001 Apr 5;58(4):398-409
Authors: Takashima S
The large dipole moment of globular proteins has been well known because of the detailed studies using dielectric relaxation and electro-optical methods. The search for the origin of these dipolemoments, however, must be based on the detailed knowledge on protein structure with atomic resolutions. At present, we have two sources of information on the structure of protein molecules: (1) x-ray databases obtained in crystalline state; (2) NMR databases obtained in solution state. While x-ray databases consist of only one model, NMR databases, because of the fluctuation of the protein folding in solution, consist of a number of models, thus enabling the computation of dipole moment repeated for all these models. The aim of this work, using these databases, is the detailed investigation on the interdependence between the structure and dipole moment of protein molecules. The dipole moment of protein molecules has roughly two components: one dipole moment is due to surface charges and the other, core dipole moment, is due to polar groups such as N--H and C==O bonds. The computation of surface charge dipole moment consists of two steps: (A) calculation of the pK shifts of charged groups for electrostatic interactions and (B) calculation of the dipole moment using the pK corrected for electrostatic shifts. The dipole moments of several proteins were computed using both NMR and x-ray databases. The dipole moments of these two sets of calculations are, with a few exceptions, in good agreement with one another and also with measured dipole moments.
iHADAMAC: a complementary tool for sequential resonance assignment of globular and highly disordered proteins
iHADAMAC: a complementary tool for sequential resonance assignment of globular and highly disordered proteins
Publication year: 2011
Source: Journal of Magnetic Resonance, Available online 9 November 2011</br>
Sophie*Feuerstein, Michael J.*Plevin, Dieter*Willbold, Bernhard*Brutscher</br>
An experiment, iHADAMAC, is presented that yields information on the amino-acid type of individual residues in a protein by editing theH-N correlations into 7 different 2D spectra, each corresponding to a different class of amino-acid types. Amino-acid type discrimination is realized via a Hadamard...
[NMR paper] Contact model for the prediction of NMR N-H order parameters in globular proteins.
Contact model for the prediction of NMR N-H order parameters in globular proteins.
Related Articles Contact model for the prediction of NMR N-H order parameters in globular proteins.
J Am Chem Soc. 2002 Oct 30;124(43):12654-5
Authors: Zhang F, Brüschweiler R
An analytical relationship is presented for the estimation of NMR S2 order parameters of N-HN vectors of the protein backbone from high-resolution protein structures. The relationship solely depends on close contacts of the peptide plane to the rest of the protein. Application of the...
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11-24-2010 08:58 PM
[NMR paper] Interpretation of 15N NMR relaxation data of globular proteins using hydrodynamic cal
Interpretation of 15N NMR relaxation data of globular proteins using hydrodynamic calculations with HYDRONMR.
Related Articles Interpretation of 15N NMR relaxation data of globular proteins using hydrodynamic calculations with HYDRONMR.
J Biomol NMR. 2002 Jun;23(2):139-50
Authors: Bernadó P, García de la Torre J, Pons M
HYDRONMR is an implementation of state of the art hydrodynamic modeling to calculate the spectral density functions for NH or C(alpha)-H vectors in a rigid protein structure starting from an atomic level representation. Thus...
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11-24-2010 08:49 PM
[NMR paper] HYDRONMR: prediction of NMR relaxation of globular proteins from atomic-level structu
HYDRONMR: prediction of NMR relaxation of globular proteins from atomic-level structures and hydrodynamic calculations.
Related Articles HYDRONMR: prediction of NMR relaxation of globular proteins from atomic-level structures and hydrodynamic calculations.
J Magn Reson. 2000 Nov;147(1):138-46
Authors: García de la Torre J, Huertas ML, Carrasco B
The heteronuclear NMR relaxation of globular proteins depends on the anisotropic rotational diffusion tensor. Using our previous developments for prediction of hydrodynamic properties of arbitrarily...
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11-19-2010 08:29 PM
[NMR paper] The electric dipole moment of DNA-binding HU protein calculated by the use of an NMR
The electric dipole moment of DNA-binding HU protein calculated by the use of an NMR database.
Related Articles The electric dipole moment of DNA-binding HU protein calculated by the use of an NMR database.
Biophys Chem. 1999 Aug 30;80(3):153-63
Authors: Takashima S, Yamaoka K
Electric birefringence measurements indicated the presence of a large permanent dipole moment in HU protein-DNA complex. In order to substantiate this observation, numerical computation of the dipole moment of HU protein homodimer was carried out by using NMR protein...
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11-18-2010 08:31 PM
[Question from NMRWiki Q&A forum] Free program to calculate the theoretical second moment from crystal structure data?
Free program to calculate the theoretical second moment from crystal structure data?
Does anyone know of a free, available program I can use to calculate the theoretical second moment from crystal structure data? I was only able to find one online, written in a mix of FORTRAN 77/90. The current limitations of the program can't accommodate my system (big unit cell and lots of atoms), and FORTRAN coding really isn't my fortay.
Ideally, the program would be able to simulate second moment(s) by defining specific rotational axes, and modeling different rotational rates and hopping angles...
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09-29-2010 10:24 AM
[NMR paper] Attenuated T2 relaxation by mutual cancellation of dipole-dipole coupling and chemica
Attenuated T2 relaxation by mutual cancellation of dipole-dipole coupling and chemical shift anisotropy indicates an avenue to NMR structures of very large biological macromolecules in solution.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--highwire.stanford.edu-icons-externalservices-pubmed-custom-pnas_full_free.gif http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www.pubmedcentral.nih.gov-corehtml-pmc-pmcgifs-pubmed-pmc.gif Related Articles Attenuated T2 relaxation by mutual cancellation of dipole-dipole coupling and chemical shift anisotropy indicates an...