Preferential conformation of substance P in solution.
Eur J Biochem
; 154(1): 77-85, 1986 Jan 02.
Article
em En
| MEDLINE
| ID: mdl-2417837
ABSTRACT
The three-dimensional structure of substance P has been studied by 1H-NMR, (500 MHz), and by circular dichroism (CD) in different solvents. The analysis of the different NMR parameters suggest that substance P adopts a rather extended structure in dimethylsulfoxide and pyridine. In water, besides the aggregation phenomenon, the monomeric substance P presents a complex conformational equilibrium. The addition of sodium dodecylsulfate to the aqueous solution induces, as shown by CD spectroscopy, a preferential alpha-helical conformation. And in methanol three structural conclusions may be drawn the flexibility of the N-terminal Arg-Pro-Lys, the alpha-helical structure of Pro4-Gln5-Gln6-Phe7-Phe8 and the interaction of the C-terminal carboxamide with the primary amides from both glutamines.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Substância P
Idioma:
En
Revista:
Eur J Biochem
Ano de publicação:
1986
Tipo de documento:
Article