Related ArticlesAn increase in side chain entropy facilitates effector binding: NMR characterization of the side chain methyl group dynamics in Cdc42Hs.
Biochemistry. 2001 Apr 17;40(15):4590-600
Authors: Loh AP, Pawley N, Nicholson LK, Oswald RE
Cdc42Hs is a signal transduction protein that is involved in cytoskeletal growth and organization. We describe here the methyl side chain dynamics of three forms of (2)H,(13)C,(15)N-Cdc42Hs [GDP-bound (inactive), GMPPCP-bound (active), and GMPPCP/PBD46-bound (effector-bound)] from (13)C-(1)H NMR measurements of deuterium T(1) and T(1 rho) relaxation times. A wide variation in flexibility was observed throughout the protein, with methyl axis order parameters (S(2)(axis)) ranging from 0.2 to 0.4 (highly disordered) in regions near the PBD46 binding site to 0.8--1.0 (highly ordered) in some helices. The side chain dynamics of the GDP and GMPPCP forms are similar, with methyl groups on the PBD46 binding surface experiencing significantly greater mobility (lower S(2)(axis)) than those not on the binding surface. Binding of PBD46 results in a significant increase in the disorder and a corresponding increase in entropy for the majority of methyl groups. Many of the methyl groups that experience an increase in mobility are found in residues that are not part of the PBD46 binding interface. This entropy gain represents a favorable contribution to the overall entropy of effector binding and partially offsets unfavorable entropy losses such as those that occur in the backbone.
[NMR paper] Probing the binding entropy of ligand-protein interactions by NMR.
Probing the binding entropy of ligand-protein interactions by NMR.
Related Articles Probing the binding entropy of ligand-protein interactions by NMR.
Chembiochem. 2005 Sep;6(9):1585-91
Authors: Homans SW
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[NMR paper] Characterization of threonine side chain dynamics in an antifreeze protein using natu
Characterization of threonine side chain dynamics in an antifreeze protein using natural abundance 13C NMR spectroscopy.
Related Articles Characterization of threonine side chain dynamics in an antifreeze protein using natural abundance 13C NMR spectroscopy.
J Biomol NMR. 2004 Jun;29(2):139-50
Authors: Daley ME, Sykes BD
The dynamics of threonine side chains of the Tenebrio molitor antifreeze protein (TmAFP) were investigated using natural abundance (13)C NMR. In TmAFP, the array of threonine residues on one face of the protein is responsible...
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[NMR paper] Main chain and side chain dynamics of a heme protein: 15N and 2H NMR relaxation studi
Main chain and side chain dynamics of a heme protein: 15N and 2H NMR relaxation studies of R. capsulatus ferrocytochrome c2.
Related Articles Main chain and side chain dynamics of a heme protein: 15N and 2H NMR relaxation studies of R. capsulatus ferrocytochrome c2.
Biochemistry. 2001 Jun 5;40(22):6559-69
Authors: Flynn PF, Bieber Urbauer RJ, Zhang H, Lee AL, Wand AJ
A detailed characterization of the main chain and side chain dynamics in R. capsulatus ferrocytochrome c(2) derived from (2)H NMR relaxation of methyl group resonances is...
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[NMR paper] NMR detection of side chain-side chain hydrogen bonding interactions in 13C/15N-label
NMR detection of side chain-side chain hydrogen bonding interactions in 13C/15N-labeled proteins.
Related Articles NMR detection of side chain-side chain hydrogen bonding interactions in 13C/15N-labeled proteins.
J Biomol NMR. 2000 Aug;17(4):305-10
Authors: Liu A, Hu W, Majumdar A, Rosen MK, Patel DJ
We describe the direct observation of side chain-side chain hydrogen bonding interactions in proteins with sensitivity-enhanced NMR spectroscopy. Specifically, the remote correlation between the guanidinium nitrogen 15Nepsilon of arginine 71,...
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[NMR paper] Detection of very weak side chain-main chain hydrogen bonding interactions in medium-
Detection of very weak side chain-main chain hydrogen bonding interactions in medium-size 13C/15N-labeled proteins by sensitivity-enhanced NMR spectroscopy.
Related Articles Detection of very weak side chain-main chain hydrogen bonding interactions in medium-size 13C/15N-labeled proteins by sensitivity-enhanced NMR spectroscopy.
J Biomol NMR. 2000 May;17(1):79-82
Authors: Liu A, Hu W, Majumdar A, Rosen MK, Patel DJ
We describe the direct observation of very weak side chain-main chain hydrogen bonding interactions in medium-size 13C/15N-labeled...
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[NMR paper] Negative entropy of halothane binding to protein: 19F-NMR with a novel cell.
Negative entropy of halothane binding to protein: 19F-NMR with a novel cell.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles Negative entropy of halothane binding to protein: 19F-NMR with a novel cell.
Biochim Biophys Acta. 1997 Mar 15;1334(2-3):117-22
Authors: Yoshida T, Tanaka M, Mori Y, Ueda I
An obvious difficulty of the study of binding of volatile anesthetics to proteins is to prevent loss of the ligand during the procedure. A novel NMR tube was designed that...
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[NMR paper] NMR characterization of side chain flexibility and backbone structure in the type I a
NMR characterization of side chain flexibility and backbone structure in the type I antifreeze protein at near freezing temperatures.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles NMR characterization of side chain flexibility and backbone structure in the type I antifreeze protein at near freezing temperatures.
Biochemistry. 1996 Dec 24;35(51):16698-704
Authors: Gronwald W, Chao H, Reddy DV, Davies PL, Sykes BD, Sönnichsen FD
The flexibility of the polar side chains in the...
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[NMR paper] Investigation of a side-chain-side-chain hydrogen bond by mutagenesis, thermodynamics
Investigation of a side-chain-side-chain hydrogen bond by mutagenesis, thermodynamics, and NMR spectroscopy.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www3.interscience.wiley.com-aboutus-images-wiley_interscience_pubmed_logo_FREE_120x27.gif http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www.pubmedcentral.nih.gov-corehtml-pmc-pmcgifs-pubmed-pmc.gif Related Articles Investigation of a side-chain-side-chain hydrogen bond by mutagenesis, thermodynamics, and NMR spectroscopy.
Protein Sci. 1995 May;4(5):936-44
Authors: Hammen PK, Scholtz...