L-alanyl-L-alanyl-L-alanine: parallel pleated sheet arrangement in unhydrated crystal structure, and comparisons with the antiparallel sheet structure.
Biopolymers
; 31(2): 187-92, 1991 Feb 05.
Article
en En
| MEDLINE
| ID: mdl-2043749
The tripeptide L-alanyl-L-alanyl-L-alanine has been crystallized from a water/dimethylformamide solution in an unhydrated form, with cell dimensions a = 11.849, b = 10.004, c = 9.862 A, beta = 101.30 degrees, monoclinic space group P21 with 4 molecules per cell (2 independent molecules in the asymmetric unit). The structure was determined by direct methods and refined to a discrepancy index R = 0.057. The tri-L-alanine molecules are packed in a parallel pleated sheet arrangement with unusually long amide nitrogen-carbonyl oxygen contacts within sheets. Comparisons are made with the antiparallel pleated sheet structure of tri-L-alanine hemihydrate, previously crystallized from the same solvent system.
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01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oligopéptidos
/
Conformación Proteica
Idioma:
En
Revista:
Biopolymers
Año:
1991
Tipo del documento:
Article
País de afiliación:
Canadá
Pais de publicación:
Estados Unidos