BioNMR
NMR aggregator & online community since 2003
BioNMR    
Learn or help to learn NMR - get free NMR books!
 

Go Back   BioNMR > Educational resources > Journal club
Advanced Search



Jobs Groups Conferences Literature Pulse sequences Software forums Programs Sample preps Web resources BioNMR issues


Webservers
NMR processing:
MDD
NMR assignment:
Backbone:
Autoassign
MARS
UNIO Match
PINE
Side-chains:
UNIO ATNOS-Ascan
NOEs:
UNIO ATNOS-Candid
UNIO Candid
ASDP
Structure from NMR restraints:
Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
UNIO Candid
Fragment-based:
BMRB CS-Rosetta
Rosetta-NMR (Robetta)
Template-based:
GeNMR
I-TASSER
Refinement:
Amber
Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
Simshift
Torsion angles from chemical shifts:
Preditor
TALOS
Promega- Proline
Secondary structure from chemical shifts:
CSI (via RCI server)
TALOS
MICS caps, β-turns
d2D
PECAN
Flexibility from chemical shifts:
RCI
Interactions from chemical shifts:
HADDOCK
Chemical shifts re-referencing:
Shiftcor
UNIO Shiftinspector
LACS
CheckShift
RefDB
NMR model quality:
NOEs, other restraints:
PROSESS
PSVS
RPF scores
iCing
Chemical shifts:
PROSESS
CheShift2
Vasco
iCing
RDCs:
DC
Anisofit
Pseudocontact shifts:
Anisofit
Protein geomtery:
Resolution-by-Proxy
PROSESS
What-If
iCing
PSVS
MolProbity
SAVES2 or SAVES4
Vadar
Prosa
ProQ
MetaMQAPII
PSQS
Eval123D
STAN
Ramachandran Plot
Rampage
ERRAT
Verify_3D
Harmony
Quality Control Check
NMR spectrum prediction:
FANDAS
MestReS
V-NMR
Flexibility from structure:
Backbone S2
Methyl S2
B-factor
Molecular dynamics:
Gromacs
Amber
Antechamber
Chemical shifts prediction:
From structure:
Shiftx2
Sparta+
Camshift
CH3shift- Methyl
ArShift- Aromatic
ShiftS
Proshift
PPM
CheShift-2- Cα
From sequence:
Shifty
Camcoil
Poulsen_rc_CS
Disordered proteins:
MAXOCC
Format conversion & validation:
CCPN
From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
Zyggregator
Isotope labeling:
UPLABEL
Solid-state NMR:
sedNMR


Reply
Thread Tools Search this Thread Rate Thread Display Modes
  #1  
Unread 08-22-2010, 02:27 PM
nmrlearner's Avatar
Senior Member
 
Join Date: Jan 2005
Posts: 17,577
Points: 193,617, Level: 100
Points: 193,617, Level: 100 Points: 193,617, Level: 100 Points: 193,617, Level: 100
Level up: 0%, 0 Points needed
Level up: 0% Level up: 0% Level up: 0%
Activity: 50.7%
Activity: 50.7% Activity: 50.7% Activity: 50.7%
Last Achievements
Award-Showcase
NMR Credits: 0
NMR Points: 193,617
Downloads: 0
Uploads: 0
Default 19F NMR relaxation studies on 5-fluorotryptophan- and tetradeutero-5-fluorotryptophan

19F NMR relaxation studies on 5-fluorotryptophan- and tetradeutero-5-fluorotryptophan-labeled E. coli glucose/galactose receptor.

Related Articles 19F NMR relaxation studies on 5-fluorotryptophan- and tetradeutero-5-fluorotryptophan-labeled E. coli glucose/galactose receptor.

J Biomol NMR. 1996 Jun;7(4):261-72

Authors: Luck LA, Vance JE, O'Connell TM, London RE

19F NMR relaxation studies have been carried out on a fluorotryptophan-labeled E. coli periplasmic glucose/galactose receptor (GGR). The protein was derived from E. coli grown on a medium containing a 50:50 mixture of 5-fluorotryptophan and [2,4,6,7-2H4]-5-fluorotryptophan. As a result of the large gamma-isotope shift, the two labels give rise to separate resonances, allowing relaxation contributions of the substituted indole protons to be selectively monitored. Spin-lattice relaxation rates were determined at field strengths of 11.75 T and 8.5 T, and the results were analyzed using a model-free formalism. In order to evaluate the contributions of chemical shift anisotropy to the observed relaxation parameters, solid-state NMR studies were performed on [2,4,6,7-2H4]-5-fluorotryptophan. Analysis of the observed 19F powder pattern lineshape resulted in anisotropy and asymmetry parameters of delta sigma = -93.5 ppm and eta = 0.24. Theoretical analyses of the relaxation parameters are consistent with internal motion of the fluorotryptophan residues characterized by order parameters S2 of approximately 1, and by correlation times for internal motion approximately 10(-11)s. Simultaneous least squares fitting of the spin-lattice relaxation and line-width data with tau i set at 10 ps yielded a molecular correlation time of 20 ns for the glucose-complexed GGR, and a mean order parameter S2 = 0.89 for fluorotryptophan residues 183, 127, 133, and 195. By contrast, the calculated order parameter for FTrp284, located on the surface of the protein, was 0.77. Significant differences among the spin-lattice relaxation rates of the five fluorotryptophan residues of glucose-complexed GGR were also observed, with the order of relaxation rates given by: R1F183 > R1F127 approximately R1F133 approximately R1F195 > R1F284. Although such differences may reflect motional variations among these residues, the effects are largely predicted by differences in the distribution of nearby hydrogen nuclei, derived from crystal structure data. In the absence of glucose, spin-lattice relaxation rates for fluorotryptophan residues 183, 127, 133, and 195 were found to decrease by a mean of 13%, while the value for residue 284 exhibits an increase of similar magnitude relative to the liganded molecule. These changes are interpreted in terms of a slower overall correlation time for molecular motion, as well as a change in the internal mobility of FTrp284, located in the hinge region of the receptor.

PMID: 8765734 [PubMed - indexed for MEDLINE]



Source: PubMed
Reply With Quote


Did you find this post helpful? Yes | No

Reply
Similar Threads
Thread Thread Starter Forum Replies Last Post
[NMR paper] Effects of Phe-to-Trp mutation and fluorotryptophan incorporation on the solution structure of cardiac troponin C, and analysis of its suitability as a potential probe for in situ NMR studies.
Effects of Phe-to-Trp mutation and fluorotryptophan incorporation on the solution structure of cardiac troponin C, and analysis of its suitability as a potential probe for in situ NMR studies. Related Articles Effects of Phe-to-Trp mutation and fluorotryptophan incorporation on the solution structure of cardiac troponin C, and analysis of its suitability as a potential probe for in situ NMR studies. Protein Sci. 2005 Sep;14(9):2447-60 Authors: Wang X, Mercier P, Letourneau PJ, Sykes BD 19F NMR spectroscopy is potentially a powerful tool for...
nmrlearner Journal club 0 12-01-2010 06:56 PM
[NMR paper] NMR relaxation studies on the hydrate layer of intrinsically unstructured proteins.
NMR relaxation studies on the hydrate layer of intrinsically unstructured proteins. Related Articles NMR relaxation studies on the hydrate layer of intrinsically unstructured proteins. Biophys J. 2005 Mar;88(3):2030-7 Authors: Bokor M, Csizmók V, Kovács D, Bánki P, Friedrich P, Tompa P, Tompa K Intrinsically unstructured/disordered proteins (IUPs) exist in a disordered and largely solvent-exposed, still functional, structural state under physiological conditions. As their function is often directly linked with structural disorder,...
nmrlearner Journal club 0 11-24-2010 10:03 PM
[NMR paper] Thermodynamic insights into proteins from NMR spin relaxation studies.
Thermodynamic insights into proteins from NMR spin relaxation studies. Related Articles Thermodynamic insights into proteins from NMR spin relaxation studies. Curr Opin Struct Biol. 2001 Oct;11(5):555-9 Authors: Spyracopoulos L, Sykes BD NMR spin relaxation measurements of picosecond to nanosecond timescale backbone and sidechain fluctuations of protein molecules, and subsequent entropic interpretation yield interesting, but sometimes counterintuitive, insights into proteins. The stabilities of proteins and protein interactions are achieved...
nmrlearner Journal club 0 11-19-2010 08:44 PM
[NMR paper] Backbone dynamics of the c-Jun leucine zipper: 15N NMR relaxation studies.
Backbone dynamics of the c-Jun leucine zipper: 15N NMR relaxation studies. http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles Backbone dynamics of the c-Jun leucine zipper: 15N NMR relaxation studies. Biochemistry. 1996 Apr 16;35(15):4867-77 Authors: MacKay JP, Shaw GL, King GF The backbone dynamics of the coiled-coil leucine zipper domain of c-Jun have been studied using proton-detected two-dimensional 1H-15N NMR spectroscopy. Longitudinal (T1) and transverse (T2) 15N relaxation times,...
nmrlearner Journal club 0 08-22-2010 02:27 PM
[NMR paper] 15N NMR relaxation studies of free and inhibitor-bound 4-oxalocrotonate tautomerase:
15N NMR relaxation studies of free and inhibitor-bound 4-oxalocrotonate tautomerase: backbone dynamics and entropy changes of an enzyme upon inhibitor binding. http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles 15N NMR relaxation studies of free and inhibitor-bound 4-oxalocrotonate tautomerase: backbone dynamics and entropy changes of an enzyme upon inhibitor binding. Biochemistry. 1996 Dec 17;35(50):16036-47 Authors: Stivers JT, Abeygunawardana C, Mildvan AS The solution secondary...
nmrlearner Journal club 0 08-22-2010 02:20 PM
[NMR paper] NMR assignments and relaxation studies of Thiobacillus versutus ferrocytochrome c-550
NMR assignments and relaxation studies of Thiobacillus versutus ferrocytochrome c-550 indicate the presence of a highly mobile 13-residues long C-terminal tail. 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 NMR assignments and relaxation studies of Thiobacillus versutus ferrocytochrome c-550 indicate the presence of a highly mobile 13-residues long...
nmrlearner Journal club 0 08-22-2010 02:20 PM
[NMR paper] 15N NMR relaxation studies of the FK506 binding protein: backbone dynamics of the unc
15N NMR relaxation studies of the FK506 binding protein: backbone dynamics of the uncomplexed receptor. Related Articles 15N NMR relaxation studies of the FK506 binding protein: backbone dynamics of the uncomplexed receptor. Biochemistry. 1993 Sep 7;32(35):9000-10 Authors: Cheng JW, Lepre CA, Chambers SP, Fulghum JR, Thomson JA, Moore JM Backbone dynamics of the major tacrolimus (FK506) binding protein (FKBP-12, 107 amino acids) have been studied using 15N relaxation data derived from proton-detected two-dimensional 1H-15N NMR spectroscopy....
nmrlearner Journal club 0 08-22-2010 03:01 AM
[NMR paper] Protein-water interactions from 2H NMR relaxation studies: influence of hydrophilic,
Protein-water interactions from 2H NMR relaxation studies: influence of hydrophilic, hydrophobic, and electrostatic interactions. Related Articles Protein-water interactions from 2H NMR relaxation studies: influence of hydrophilic, hydrophobic, and electrostatic interactions. Adv Exp Med Biol. 1991;302:541-60 Authors: Kumosinski TF, Pessen H, Farrell HM The importance of water interactions with proteins in food systems is well documented. A controversy exists, however, as to the nature of these interactions and the effect of protein structural...
nmrlearner Journal club 0 08-21-2010 11:16 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



BioNMR advertisements to pay for website hosting and domain registration. Nobody does it for us.



Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright, BioNMR.com, 2003-2013
Search Engine Friendly URLs by vBSEO 3.6.0

All times are GMT. The time now is 01:35 AM.


Map