scholarly journals Structural Characterization of Picket-fence Porphyrinatoiron with .OMEGA.-Hydroxy-2,2-dimethylicosanoyl Side-chains vs. .OMEGA.-Cholinephosphoryl-2,2-dimethylicosanoyl Side-chains by FAB High-energy-CID MS/MS.

1998 ◽  
Vol 46 (3) ◽  
pp. 250-254 ◽  
Author(s):  
Toshimichi SHIBUE ◽  
Hisashi KAMBE ◽  
Hiroyuki NISHIDE ◽  
Eishun TSUCHIDA ◽  
Satoko AKASHI ◽  
...  
Keyword(s):  
Structural Characterization ◽  
High Energy ◽  
Side Chains ◽  
Picket Fence

Structural characterization of folded and extended conformations in peptides containing γ amino acids with proteinogenic side chains: crystal structures of γn, (αγ)n and γγδγ sequences

2015 ◽  
Vol 39 (5) ◽  
pp. 3319-3326 ◽  
Author(s):  
Madhusudana M. B. Reddy ◽  
K. Basuroy ◽  
S. Chandrappa ◽  
B. Dinesh ◽  
B. Vasantha ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Crystal Structures ◽  
Structural Characterization ◽  
Side Chains ◽  
Amino Acid Residues

γn amino acid residues can be incorporated into structures in γn and hybrid sequences containing folded and extended α and δ residues.

Synthesis, crystallization, X-ray structural characterization and solid-state assembly of a cyclic hexapeptoid with propargyl and methoxyethyl side chains

2017 ◽  
Vol 73 (3) ◽  
pp. 399-412 ◽  
Author(s):  
Consiglia Tedesco ◽  
Eleonora Macedi ◽  
Alessandra Meli ◽  
Giovanni Pierri ◽  
Giorgio Della Sala ◽  
...  
Keyword(s):  
Solid State ◽  
Hydrogen Bonds ◽  
Structural Characterization ◽  
Crystal Form ◽  
Side Chains ◽  
Crystal Forms ◽  
Hydrate Crystal ◽  
The Stability ◽  
Efficient Packing

The synthesis and the structural characterization of a cyclic hexapeptoid with four methoxyethyl and two propargyl side chains have disclosed the presence of a hydrate crystal form [form (I)] and an anhydrous crystal form [form (II)]. The relative amounts of form (I) and form (II) in the as-purified product were determined by Rietveld refinement and depend on the purification procedures. In crystal form (I), peptoid molecules assemble in a columnar arrangement by means of side-chain-to-backbone C=CH...OC hydrogen bonds. In the anhydrous crystal form (II), cyclopeptoid molecules form ribbons by means of backbone-to-backbone CH2...OC hydrogen bonds, thus mimicking β-sheet secondary structures in proteins. In both crystal forms side chains act as joints among the columns or the ribbons and contribute to the stability of the whole solid-state assembly. Water molecules in the hydrate crystal form (I) bridge columns of cyclic peptoid molecules, providing a more efficient packing.

Structural characterization of negatively charged glycosaminoglycans using high-energy (50–150keV) collisional activation

2009 ◽  
Vol 285 (1-2) ◽  
pp. 70-77 ◽  
Author(s):  
Christopher J. Taylor ◽  
Ruth M. Burke ◽  
Bohan Wu ◽  
Subhasis Panja ◽  
Steen Brøndsted Nielsen ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Collisional Activation ◽  
High Energy

Structural characterization of a peptoid with lysine-like side chains and biological activity using NMR and computational methods

2013 ◽  
Vol 11 (4) ◽  
pp. 640-647 ◽  
Author(s):  
Ulrich Sternberg ◽  
Esther Birtalan ◽  
Igor Jakovkin ◽  
Burkhard Luy ◽  
Ute Schepers ◽  
...  
Keyword(s):  
Biological Activity ◽  
Computational Methods ◽  
Structural Characterization ◽  
Side Chains
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