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M2 TRANSMEMBRANE SEGMENT OF ALPHA-SUBUNIT OF NICOTINIC ACETYLCHOLINE RECEPTOR FROM TORPEDO CALIFORNICA, NMR, 20 STRUCTURES
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
DQF-COSY
CDCL3/CD3OH=1/1 WITH 0.1 M LICLO4
0.1 M LICLO4
4.0
1 atm
303
2
TOCSY
CDCL3/CD3OH=1/1 WITH 0.1 M LICLO4
0.1 M LICLO4
4.0
1 atm
303
3
NOESY
CDCL3/CD3OH=1/1 WITH 0.1 M LICLO4
0.1 M LICLO4
4.0
1 atm
303
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
UNITY
600
NMR Refinement
Method
Details
Software
distance geometry
REFINEMENT DETAILS CAN BE FOUND IN THE JRNL CITATION ABOVE. THE NMR STUDY HAS BEEN CONDUCTED USING THE SYNTHETIC PEPTIDE WITH METHIONINE 243 REPLACED BY NORLEUCINE. SUCH AN ISOSTERIC REPLACEMENT USUALLY DOES NOT AFFECT THE PEPTIDE CONFORMATION, WHILE SYMPLIFYING THE SYNTHESIS. TO AVOID DIFFICULTIES WHICH MAY ARISE FROM THE PRESENCE OF A NONSTANDARD AMINO ACID RESIDUE AS WELL AS FOR THE PURPOSE OF AGREEMENT BETWEEN THE NATIVE M2 FRAGMENT AND THE CONFORMERS TO BE DEPOSITED, THE NORLEUCINE RESIDUE WAS REPLACED BY METHIONINE.
FANTOM
NMR Ensemble Information
Conformer Selection Criteria
LEAST RESTRAINTS VIOLATION
Conformers Calculated Total Number
300
Conformers Submitted Total Number
20
Representative Model
4 (n/a)
Additional NMR Experimental Information
Details
THE STRUCTURE WAS DETERMINED USING 2D-1H-NMR SPECTROSCOPY IN THE MEDIUM WHICH SHOULD BE ADEQUATE FOR THE M2 SEGMENT WITH ITS NON-LIPID SURROUNDING IN THE INTACT NICOTINIC ACTYLCHOLINE RECEPTOR. THE PH GIVEN IN THE EXPERIMENTAL DETAILS IS AN APPROXIMATION ONLY FOR THE MIXTURE OF ORGANIC SOLVENTS USED.
Computation: NMR Software
#
Classification
Version
Software Name
Author
1
refinement
FANTOM
4.0
R.FRACZKIEWICZ,C.MUMENTHALER,B. VON FREYBERG, T.SCHAUMANN,W.BRAUN