Solution structures of calcitonin-gene-related-peptide analogues of calcitonin-gene-related peptide and amylin.
Biochem J
; 275 ( Pt 3): 785-8, 1991 May 01.
Article
em En
| MEDLINE
| ID: mdl-2039456
ABSTRACT
Near-u.v. and far-u.v. c.d. spectra of human alpha-calcitonin-gene-related peptide (h alpha CGRP), analogues and fragments of CGRP and amylin were recorded in aqueous solution and in trifluoroethanol (TFE)/water mixtures. All peptides contained significant amounts of alpha-helix in aqueous solution, and this amount increased on adding TFE. The helical content was unaffected by pH and salt. However, amylin contained much less helix than CGRP and the c.d. spectrum was more temperature-sensitive. A band in the near-u.v. c.d. spectrum of CGRP (but not present in the spectrum of amylin) was attributed to the disulphide bond in CGRP. The intensity of this band was pH-dependent and titrated with a pKa of 6.5, suggesting the involvement of histidine ionization.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peptídeo Relacionado com Gene de Calcitonina
/
Amiloide
Limite:
Humans
Idioma:
En
Revista:
Biochem J
Ano de publicação:
1991
Tipo de documento:
Article