Keywords Parole chiave: Oligopeptide, Tert Butyloxycarbonylleucyl Aminosuccinyl Phenylalaninamide, Tert-Butyloxycarbonylleucyl-Aminosuccinyl-Phenylalaninamide, Article, Chemical Structure, Protein Conformation, X Ray Diffraction, Models, Molecular, Support, Non-U.S. Gov, X-Ray Diffraction, Non-U. S. Gov,
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References Riferimenti: Not available. Non disponibili.
Solid-state conformations of aminosuccinyl peptides: crystal structure of tert-butyloxycarbonyl-L-leucyl-L-aminosuccinyl-L-phenylalaninami de
The protected tripeptide tert-butyloxycarbonyl-L-leucyl-L-aminosuccinyl-L-phenylalaninamide crystallizes in the orthorhombic space group P2(1)2(1)2(1), with a = 6.214(3), b = 12.832(3), c = 33.094(4) A, Z = 4. The structure was solved by direct methods using MULTAN 80 and refined to an R value of 0.055 for 1458 reflections. The bond lengths and angles are in good agreement with the standard values. The peptide backbone adopts a type II' beta-bend conformation with a weak intramolecular hydrogen bond between the CO group of the leucyl residue and the C-terminal NH2 group. In agreement with previous studies, this structure confirms the high propensity of aminosuccinyl peptides to adopt a type II' beta-bend conformation. The role of this conformation in relation to the deamidation process in proteins is also discussed.
Solid-state conformations of aminosuccinyl peptides: crystal structure of tert-butyloxycarbonyl-L-leucyl-L-aminosuccinyl-L-phenylalaninami de
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