Related ArticlesSolution 1H NMR of the molecular and electronic structure of the heme cavity and substrate binding pocket of high-spin ferric horseradish peroxidase: effect of His42Ala mutation.
J Am Chem Soc. 2001 May 9;123(18):4243-54
Authors: Asokan A, de Ropp JS, Newmyer SL, Ortiz de Montellano PR, La Mar GN
Solution 1H NMR has been used to assign a major portion of the heme environment and the substrate-binding pocket of resting state horseradish peroxidase, HRP, despite the high-spin iron(III) paramagnetism, and a quantitative interpretive basis of the hyperfine shifts is established. The effective assignment protocol included 2D NMR over a wide range of temperatures to locate residues shifted by paramagnetism, relaxation analysis, and use of dipolar shifts predicted from the crystal structure by an axial paramagnetic susceptibility tensor normal to the heme. The most effective use of the dipolar shifts, however, is in the form of their temperature gradients, rather than by their direct estimation as the difference of observed and diamagnetic shifts. The extensive assignments allowed the quantitative determination of the axial magnetic anisotropy, Deltachi(ax) = -2.50 x 10(-8) m(3)/mol, oriented essentially normal to the heme. The value of Deltachi(ax) together with the confirmed T(-2) dependence allow an estimate of the zero-field splitting constant D = 15.3 cm(-1), which is consistent with pentacoordination of HRP. The solution structure was generally indistinguishable from that in the crystal (Gajhede, M.; Schuller, D. J.; Henriksen, A.; Smith, A. T.; Poulos, T. L. Nature Structural Biology 1997, 4, 1032-1038) except for Phe68 of the substrate-binding pocket, which was found turned into the pocket as found in the crystal only upon substrate binding (Henriksen, A.; Schuller, D. J.; Meno, K.; Welinder, K. G.; Smith, A. T.; Gajhede, M. Biochemistry 1998, 37, 8054-8060). The reorientation of several rings in the aromatic cluster adjacent to the proximal His170 is found to be slow on the NMR time scale, confirming a dense, closely packed, and dynamically stable proximal side up to 55 degrees C. Similar assignments on the H42A-HRP mutant reveal conserved orientations for the majority of residues, and only a very small decrease in Deltachi(ax) or D, which dictates that five-coordination is retained in the mutant. The two residues adjacent to residue 42, Ile53 and Leu138, reorient slightly in the mutant H42A protein. It is concluded that effective and very informative 1H NMR studies of the effect of either substrate binding or mutation can be carried out on resting state heme peroxidases.
[NMR paper] Studies on solution NMR structure of brazzein : Secondary structure and molecular sca
Studies on solution NMR structure of brazzein : Secondary structure and molecular scaffold.
Related Articles Studies on solution NMR structure of brazzein : Secondary structure and molecular scaffold.
Sci China C Life Sci. 1999 Aug;42(4):409-19
Authors: Gao G, Dai J, Ding M, Hellekant G, Wang J, Wang D
Brazzein is a sweet-tasting protein isolated from the fruit of West African plantPentadiplandra brazzeana Baillon. It is the smallest and the most water-soluble sweet protein discovered so far and is highly thermostable. The proton NMR study of...
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[NMR paper] Crystallization and structure solution of p53 (residues 326-356) by molecular replace
Crystallization and structure solution of p53 (residues 326-356) by molecular replacement using an NMR model as template.
Related Articles Crystallization and structure solution of p53 (residues 326-356) by molecular replacement using an NMR model as template.
Acta Crystallogr D Biol Crystallogr. 1998 Jan 1;54(Pt 1):86-9
Authors: Mittl PR, Chène P, Grütter MG
The molecular replacement method is a powerful technique for crystal structure solution but the use of NMR structures as templates often causes problems. In this work the NMR structure of...
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[NMR paper] Investigation of the solution structure of chymotrypsin inhibitor 2 using molecular d
Investigation of the solution structure of chymotrypsin inhibitor 2 using molecular dynamics: comparison to x-ray crystallographic and NMR data.
Related Articles Investigation of the solution structure of chymotrypsin inhibitor 2 using molecular dynamics: comparison to x-ray crystallographic and NMR data.
Protein Eng. 1995 Nov;8(11):1117-28
Authors: Li A, Daggett V
The native solution structure and dynamics of chymotrypsin inhibitor 2 (CI2) have been studied using a long (5.3 ns) molecular dynamics (MD) simulation without any imposed...
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[NMR paper] 1H NMR investigation of the electronic and molecular structure of the four-iron clust
1H NMR investigation of the electronic and molecular structure of the four-iron cluster ferredoxin from the hyperthermophile Pyrococcus furiosus. Identification of Asp 14 as a cluster ligand in each of the four redox states.
Related Articles 1H NMR investigation of the electronic and molecular structure of the four-iron cluster ferredoxin from the hyperthermophile Pyrococcus furiosus. Identification of Asp 14 as a cluster ligand in each of the four redox states.
Biochemistry. 1995 Sep 12;34(36):11373-84
Authors: Calzolai L, Gorst CM, Zhao ZH, Teng Q,...
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[NMR paper] Proton NMR investigation of substrate-bound heme oxygenase: evidence for electronic a
Proton NMR investigation of substrate-bound heme oxygenase: evidence for electronic and steric contributions to stereoselective heme cleavage.
Related Articles Proton NMR investigation of substrate-bound heme oxygenase: evidence for electronic and steric contributions to stereoselective heme cleavage.
Biochemistry. 1994 May 31;33(21):6631-41
Authors: Hernández G, Wilks A, Paolesse R, Smith KM, Ortiz de Montellano PR, La Mar GN
The substrate-bound form of the enzyme heme oxygenase (HO), which catalyzed the stereospecific alpha-meso bridge...
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[NMR paper] Proton NMR investigation of substrate-bound heme oxygenase: evidence for electronic a
Proton NMR investigation of substrate-bound heme oxygenase: evidence for electronic and steric contributions to stereoselective heme cleavage.
Related Articles Proton NMR investigation of substrate-bound heme oxygenase: evidence for electronic and steric contributions to stereoselective heme cleavage.
Biochemistry. 1994 May 31;33(21):6631-41
Authors: Hernández G, Wilks A, Paolesse R, Smith KM, Ortiz de Montellano PR, La Mar GN
The substrate-bound form of the enzyme heme oxygenase (HO), which catalyzed the stereospecific alpha-meso bridge...
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[NMR paper] NMR study of the molecular and electronic structure of the heme cavity in Dolabella m
NMR study of the molecular and electronic structure of the heme cavity in Dolabella met-cyano myoglobin.
Related Articles NMR study of the molecular and electronic structure of the heme cavity in Dolabella met-cyano myoglobin.
Biochim Biophys Acta. 1993 Jun 4;1163(3):287-96
Authors: Yamamoto Y, Suzuki T
The molecular and electronic structure of the active site of the cyanide-ligated ferric complex of the myoglobin from the mollusc Dolabella auricularia has been investigated using NMR. Analysis of nuclear Overhauser effects has revealed that...
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[NMR paper] 1H NMR study of the solution molecular and electronic structure of Escherichia coli f
1H NMR study of the solution molecular and electronic structure of Escherichia coli ferricytochrome b562: evidence for S = 1/2 in equilibrium S = 5/2 spin equilibrium for intact His/Met ligation.
Related Articles 1H NMR study of the solution molecular and electronic structure of Escherichia coli ferricytochrome b562: evidence for S = 1/2 in equilibrium S = 5/2 spin equilibrium for intact His/Met ligation.
Biochemistry. 1991 Feb 26;30(8):2156-65
Authors: Wu JZ, La Mar GN, Yu LP, Lee KB, Walker FA, Chiu ML, Sligar SG
The solution 500-MHz 1H NMR...