1. FT NMR WORKSHOP/===/ S.A.I.F./===/ NEHU/==/ Shillong
FT NMR WORKSHOP/===/ S.A.I.F./===/ NEHU/==/ Shillong
INTRODUCTORY LECTURE
S.ARAVAMUDHAN
Total of 10 minutes show time for 18 slides with automatic timing for slide transit
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2. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
L-alanine
Glycine
SDBS-13C NMR
L-alanylglycine
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3. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
SDBS-13C NMR
glycylglycine
Glycine
Glycylglycylglycine
glycylglycylglycylglycine
Proton NMR spectra also have similar trends
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4. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
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5. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
TEXT COPY
Bundi, A. and Wuthrich, K., "1H-NMR Parameters of the Common Amino Acid Residues Measured in Aqueous Solutions of the Linear Tetrapeptides H-Gly-Gly-X-L-Ala-OH," Biopolymers 18, (1979). ; 2 ;
Richarz, R. and Wuthrich, K., "Carbon-13 NMR Chemical Shifts of the Common Amino Acid Residues Measured in Aqueous Solutions of the Linear Tetrapeptides H-Gly-Gly-X-L-Ala-OH," Biopolymers 17, (1978). ; 3 ; Wuthrich, K. "NMR in Biological Research: Peptides and Proteins," North Holland, Amsterdam (1975).
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6. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
The values have ben tabulated for all the 20 amino acids
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7. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
Click HERE for copy
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8. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
Similarly for all the 20 amino acids characteristics in NMR are enlisted
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9. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
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10. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
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11. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
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12. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
The fist step in sequential assignment is the identification of certain amino acids, with a characteristic pattern of cross signals, i.e. of glycine, alanine, threonine, valine, leucine and isoleucine.
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13. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
The HSQC Experiment:
double resonance
It correlates the nitrogen atom of an NHx group with the directly attached proton.
Each signal in a HSQC spectrum represents a proton that is bound to a nitrogen atom.
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14. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
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15. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
Thus, dipeptides are identified and subsequently prolonged to oligopeptides by the search for further sequential contacts. Some time along the line these oligopeptides can be placed at a unique place in the primary structure by comparison with the amino acid sequence of the protein - they are sequentially assigned.
The chain of sequential connectivites is interrupted by proline residues because these have no amide proton. Therefore, no HN(i)-Halpha(i-1) cross signal can be observed. However, if the proline (i) is in its trans conformation, the sequential HN(i-1)-Hdelta(i) and Halpha(i-1)-Hdelta(i) cross signals can be observed.
Another problem is, that this approach of sequential assignment breaks down for larger proteins because the vast number of signals leads to spectral overlap which hinders the identification of signals.
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16. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
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17. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
Organic Chemistry Info
Biomolecular Structure
Protein NMR - A Practical Guide
Assigned Chemical Shift Outliers for 'Diamagnetic' Proteins
data_Standard_amino_acid_chemical_shifts_pentapeptide_GGXGG_in_Urea
Bundi, A. and Wuthrich, K., "1H-NMR Parameters of the Common Amino Acid Residues Measured in Aqueous Solution
s of the Linear Tetrapeptides H-Gly-Gly-X-L-Ala-OH," Biopolymers 18, (1979).
Spectral Data Base: 1H, 13C, IR, Raman, Mass
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18. ppt files at http://www.ugc-inno-nehu.com/NMR_animation/FTNMR-2012/
The Internet references are mainly to provide a quick reinforcement to the materials delivered at this workshop, for an immediate follow up soon after the concluding session of the workshop.
The purpose should be to make use of the NMR technique with a better authenticity by acquiring necessary copyright permissions and based on ones own experiences by gaining confidence by consulting the original publications of standard authors by standard publications. Even such resources are available from the appropriate portals with proper registration and subscriptions.
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