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.
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May 1991
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Research Article|
May 01 1991
Solution structures of calcitonin-gene-related-peptide analogues of calcitonin-gene-related peptide and amylin
J A M Hubbard;
J A M Hubbard
*Celltech Ltd., 216 Bath Road, Slough, Berks. SLl 4EN, U.K.
2†Division of Physical Biochemistry, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 IAA, U.K.
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S R Martin;
S R Martin
*Celltech Ltd., 216 Bath Road, Slough, Berks. SLl 4EN, U.K.
4†Division of Physical Biochemistry, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 IAA, U.K.
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L C Chaplin;
L C Chaplin
*Celltech Ltd., 216 Bath Road, Slough, Berks. SLl 4EN, U.K.
5†Division of Physical Biochemistry, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 IAA, U.K.
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C Bose;
C Bose
*Celltech Ltd., 216 Bath Road, Slough, Berks. SLl 4EN, U.K.
6†Division of Physical Biochemistry, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 IAA, U.K.
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S M Kelly;
S M Kelly
‡Department of Biological and Molecular Sciences, University of Stirling, Stirling FK9 4LA, Scotland, U.K.
7†Division of Physical Biochemistry, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 IAA, U.K.
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N C Price
N C Price
‡Department of Biological and Molecular Sciences, University of Stirling, Stirling FK9 4LA, Scotland, U.K.
8†Division of Physical Biochemistry, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 IAA, U.K.
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Publisher: Portland Press Ltd
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© 1991 The Biochemical Society, London
1991
Biochem J (1991) 275 (3): 785–788.
Citation
J A M Hubbard, S R Martin, L C Chaplin, C Bose, S M Kelly, N C Price; Solution structures of calcitonin-gene-related-peptide analogues of calcitonin-gene-related peptide and amylin. Biochem J 1 May 1991; 275 (3): 785–788. doi: https://doi.org/10.1042/bj2750785
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