Related ArticlesThe synthesis, characterization, and application of (13)c-methyl isocyanide as an NMR probe of heme protein active sites.
Methods Mol Biol. 2013;987:51-9
Authors: McCullough C, Pullela PK, Im SC, Waskell L, Sem D
Abstract
The cytochromes P450 (CYPs) play a central role in a variety of important biological oxidations, such as steroid synthesis and the metabolism of xenobiotic compounds, including most drugs. Because CYPs are frequently assayed as drug targets or as anti-targets, tools that provide confirmation of active-site binding and information on binding orientation would be of great utility. Of greatest value are assays that are reasonably high throughput. Other heme proteins, too-such as the nitric oxide synthases (NOSs), with their importance in signaling, regulation of blood pressure, and involvement in the immune response-often display critical roles in the complex functions of many higher organisms, and also require improved assay methods. To this end, we have developed an analog of cyanide, with a CH-reporter group attached to make methyl isocyanide. We describe the synthesis and use of C-methyl isocyanide as a probe of both bacterial (P450cam) and membrane-bound mammalian (CYP2B4) CYPs. The C-methyl isocyanide probe can be used in a relatively high-throughput 1-D experiment to identify binders, but it can also be used to detect structural changes in the active site based on chemical shift changes, and potentially nuclear Overhauser effects between probe and inhibitor.
A 2D 13C-CEST experiment for studying slowly exchanging protein systems using methyl probes: an application to protein folding
A 2D 13C-CEST experiment for studying slowly exchanging protein systems using methyl probes: an application to protein folding
Abstract A 2D 13C Chemical Exchange Saturation Transfer (CEST) experiment is presented for studying slowly exchanging protein systems using methyl groups as probes. The utility of the method is first established through studies of protein L, a small protein, for which chemical exchange on the millisecond time-scale is not observed. Subsequently the approach is applied to a folding exchange reaction of a G48M mutant Fyn SH3 domain, for which only cross-peaks...
nmrlearner
Journal club
0
06-16-2012 06:01 AM
Measurement of the signs of methyl 13C chemical shift differences between interconverting ground and excited protein states by R1Ï?: an application to αB-crystallin
Measurement of the signs of methyl 13C chemical shift differences between interconverting ground and excited protein states by R1Ï?: an application to αB-crystallin
Abstract Carr-Purcell-Meiboom-Gill relaxation dispersion (CPMG RD) NMR spectroscopy has emerged as a powerful tool for quantifying the kinetics and thermodynamics of millisecond time-scale exchange processes involving the interconversion between a visible ground state and one or more minor, sparsely populated invisible â??excitedâ?? conformational states. Recently it has also become possible to determine atomic resolution...
nmrlearner
Journal club
0
04-09-2012 01:19 AM
Site-Directed Methyl Group Labeling as an NMR Probe of Structure and Dynamics in Supramolecular Protein Systems: Applications to the Proteasome and to the ClpP Protease
Site-Directed Methyl Group Labeling as an NMR Probe of Structure and Dynamics in Supramolecular Protein Systems: Applications to the Proteasome and to the ClpP Protease
Tomasz L. Religa, Amy M. Ruschak, Rina Rosenzweig and Lewis E. Kay
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/0/jacsat.ahead-of-print/ja202259a/aop/images/medium/ja-2011-02259a_0002.gif
Journal of the American Chemical Society
DOI: 10.1021/ja202259a
http://feeds.feedburner.com/~ff/acs/jacsat?d=yIl2AUoC8zA
http://feeds.feedburner.com/~r/acs/jacsat/~4/rQfCMlQFoW8
nmrlearner
Journal club
0
05-20-2011 09:17 PM
Site-Directed Methyl Group Labeling as an NMR Probe of Structure and Dynamics in Supra-Molecular Protein Systems: Applications to the Proteasome and to the ClpP Protease.
Site-Directed Methyl Group Labeling as an NMR Probe of Structure and Dynamics in Supra-Molecular Protein Systems: Applications to the Proteasome and to the ClpP Protease.
Site-Directed Methyl Group Labeling as an NMR Probe of Structure and Dynamics in Supra-Molecular Protein Systems: Applications to the Proteasome and to the ClpP Protease.
J Am Chem Soc. 2011 May 11;
Authors: Religa TL, Ruschak AM, Rosenzweig R, Kay LE
Methyl groups are powerful reporters of structure, motion and function in NMR studies of supra-molecular protein assemblies. Their...
nmrlearner
Journal club
0
05-12-2011 03:40 PM
[NMR paper] Two-dimensional NMR study of the heme active site structure of chloroperoxidase.
Two-dimensional NMR study of the heme active site structure of chloroperoxidase.
Related Articles Two-dimensional NMR study of the heme active site structure of chloroperoxidase.
J Biol Chem. 2003 Mar 7;278(10):7765-74
Authors: Wang X, Tachikawa H, Yi X, Manoj KM, Hager LP
The heme active site structure of chloroperoxidase (CPO), a glycoprotein that displays versatile catalytic activities isolated from the marine mold Caldariomyces fumago, has been characterized by two-dimensional NMR spectroscopic studies. All hyperfine shifted resonances...
nmrlearner
Journal club
0
11-24-2010 08:58 PM
[NMR paper] Protein NMR spin trapping with [methyl-13C(3)]-MNP: application to the tyrosyl radica
Protein NMR spin trapping with -MNP: application to the tyrosyl radical of equine myoglobin.
Related Articles Protein NMR spin trapping with -MNP: application to the tyrosyl radical of equine myoglobin.
Free Radic Biol Med. 2001 Aug 1;31(3):383-90
Authors: Bose-Basu B, DeRose EF, Chen YR, Mason RP, London RE
Direct spin trapping studies of protein radical adducts are limited as a consequence of the long rotational correlation times and consequent broadening of the ESR resonances. It can be difficult to determine both the nature and number of...
nmrlearner
Journal club
0
11-19-2010 08:44 PM
[NMR paper] Proton NMR investigation of the heme active site structure of an engineered cytochrom
Proton NMR investigation of the heme active site structure of an engineered cytochrome c peroxidase that mimics manganese peroxidase.
Related Articles Proton NMR investigation of the heme active site structure of an engineered cytochrome c peroxidase that mimics manganese peroxidase.
Biochemistry. 1999 Jul 13;38(28):9146-57
Authors: Wang X, Lu Y
The heme active site structure of an engineered cytochrome c peroxidase that closely mimics manganese peroxidase (MnP) has been characterized by both one- and two-dimensional NMR spectroscopy. All...
nmrlearner
Journal club
0
11-18-2010 08:31 PM
[NMR paper] 1H-NMR study of heme propanoate mobility in the active site of myoglobin from Galeorh
1H-NMR study of heme propanoate mobility in the active site of myoglobin from Galeorhinus japonicus.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www3.interscience.wiley.com-aboutus-images-wiley_interscience_pubmed_logo_FREE_120x27.gif Related Articles 1H-NMR study of heme propanoate mobility in the active site of myoglobin from Galeorhinus japonicus.
Eur J Biochem. 1990 May 20;189(3):567-73
Authors: Yamamoto Y, Inoue Y, Chûjô R, Suzuki T
Time-dependent NOE studies of the C13(1) and C17(1) methylene proton resonances of the heme...
The synthesis, characterization, and application of (13)c-methyl isocyanide as an NMR probe of heme protein active sites.
Linear Mode
