Conformational stability of spectrin and fodrin.
Int J Biol Macromol
; 11(2): 73-6, 1989 Apr.
Article
em En
| MEDLINE
| ID: mdl-2489068
ABSTRACT
The conformational stability of erythrocyte spectrin and brain spectrin-like protein (fodrin) has been studied by circular dichroism. In agreement with previous reports the circular dichroism spectra of both proteins in the peptide region were almost identical. The essential differences, on the other hand, were found in the near u.v. range, most probably due to differences in the conformation of intrachain disulphide bonds. Heat denaturation curves, relating to the level of secondary structure (ellipticity at 221 nm) showed that fodrin is more stable than spectrin curves of reversible as well as irreversible denaturation are shifted to higher temperatures and also the amount of alpha-helices in the denatured state is higher. Spectrin conformation was found to be very sensitive to the presence of water-soluble organic solvents; the denaturation curves exhibit maxima and minima not typical of protein isothermic denaturation. The observed low conformational stability of spectrin is discussed in the context of its molecular environment and function in the red cell membrane.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Transporte
/
Espectrina
/
Proteínas dos Microfilamentos
/
Proteínas do Tecido Nervoso
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Int J Biol Macromol
Ano de publicação:
1989
Tipo de documento:
Article