HELIX-COIL TRANSITION OF POLY-α,L-GLUTAMIC ACID IN AQUEOUS SOLUTION STUDIED BY THE DISSOCIATION FIELD EFFECT RELAXATION METHOD

1973 ◽  
Vol 2 (4) ◽  
pp. 405-408 ◽  
Author(s):  
Tatsuya Yasunaga ◽  
Takayuki Sano ◽  
Kojiro Takahashi ◽  
Hidetoshi Takenaka ◽  
Satoshi Ito
Keyword(s):  
Aqueous Solution ◽  
Glutamic Acid ◽  
Field Effect ◽  
Relaxation Method ◽  
Coil Transition

Carbon-13 Chemical Shifts Accompanying Helix Formation

1973 ◽  
Vol 51 (4) ◽  
pp. 460-464 ◽  
Author(s):  
James R. Lyerla Jr. ◽  
Brian H. Barber ◽  
Murray H. Freedman
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Glutamic Acid ◽  
Chemical Shifts ◽  
Biological Significance ◽  
Structure Change ◽  
Shielding Effect ◽  
Amino Terminal ◽  
Helix Formation ◽  
Coil Transition

The helix–coil transition in an aqueous solution of poly-L-glutamic acid has been observed using 13C nuclear magnetic resonance. The transition from coil to helix results in pronounced deshielding of the carbonyl and C-α carbons of the polymer and a less dramatic shielding effect on the C-β carbon. These results are contrasted with the titration behavior of L-glutamic acid to delineate those shifts directly attributed to the secondary-structure change. The biological significance of this observation is supported by the 13C chemical shift differences observed for the 13C-enriched phenylalanyl residue 8 in the free 1–15 amino-terminal peptide of ribonuclease (RNase) and the 1–15 peptide:RNase S-protein complex.

Adsorption of a designed l-glutamic acid-pyrimidine derivative ligand on an activated carbon for the removal of Cu(II) from aqueous solution

2008 ◽  
Vol 116 (1-3) ◽  
pp. 445-451 ◽  
Author(s):  
María D. Gutiérrez-Valero ◽  
Paloma Arranz-Mascarós ◽  
M. Luz Godino-Salido ◽  
María D. López-León ◽  
Rafael López-Garzón ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Glutamic Acid ◽  
Pyrimidine Derivative

scholarly journals Mixed-ligand complexes of copper(II) ions with L-glutamic acid in the systems with triamines and non-covalent interaction between bioligands in aqueous solution

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Romualda Bregier-Jarzebowska
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Glutamic Acid ◽  
Mixed Ligand ◽  
Covalent Interaction ◽  
Metal Free ◽  
Overall Stability ◽  
Stability Constants Of Complexes ◽  
Formation Conditions ◽  
Amine Groups

AbstractThe interactions between L-glutamic acid (Glu) and 1,7-diamino-4-azaheptan (3,3-tri) and 1,8-diamino-4-azaoktan (Spd) in metal-free systems and in the appropriate Cu(II) ions complexes were studied by potentiometric and spectral methods. The composition and overall stability constants of complexes forming in the systems studied were determined and the reactions centres were identified. In the complex formation conditions, the ligands have positive and negative reaction centres, which are also the potential sites of metal coordination. Below pH 7 in metal-free systems, the terminal amine groups from both triamines and the oxygen atoms from –C

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