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Structure-activity studies on position 14 of human alpha-calcitonin gene-related peptide.

Abstract：

:A structure-activity study was performed to examine the role of position 14 of human alpha-calcitonin gene-related peptide (h-alpha-CGRP) in activating the CGRP receptor. Interestingly, position 14 of h-alpha-CGRP contains a glycyl residue and is part of an alpha-helix spanning residues 8-18. Analogues [Ala14]-h-alpha-CGRP, [Aib14]-h-alpha-CGRP, [Asp14]-h-alpha-CGRP, [Asn14]-h-alpha-CGRP, and [Pro14]-h-alpha-CGRP were synthesized by solid phase peptide methodology and purified by RP-HPLC. Secondary structure was measured by circular dichroism spectroscopy. Agonist activities were determined as the analogues' ability to stimulate amylase secretion from guinea pig pancreatic acini and to relax precontracted porcine coronary arteries. Analogues [Ala14]-h-alpha-CGRP, [Aib14]-h-alpha-CGRP, [Asp14]-h-alpha-CGRP, and [Asn14]-h-alpha-CGRP, all containing residues with a high helical propensity in position 14, were potent full agonists compared to h-alpha-CGRP in both tissues. Interestingly, replacement of Gly14 of h-alpha-CGRP with these residues did not substantially increase the helical content of these analogues. [Pro14]-h-alpha-CGRP, predictably, has significantly lower helical content and is a 20-fold less potent agonist on coronary artery, known to contain CGRP-1 receptor subtypes, and an antagonist on pancreatic acini, known to contain CGRP-2 receptor subtypes. In conclusion, the residue in position 14 plays a structural role in stabilizing the alpha-helix spanning residues 8-18. The alpha-helix is crucial for maintaining highly potent agonist effects of h-alpha-CGRP at CGRP receptors. The wide variety of functional groups that can be tolerated in position 14 with no substantial modification of agonist effects suggests the residue in this position is not in contact with the CGRP receptor. [Pro14]-h-alpha-CGRP may be a useful pharmacological tool to distinguish between CGRP-1 and CGRP-2 receptor subtypes.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Li J,Matsuura JE,Waugh DJ,Adrian TE,Abel PW,Manning MC,Smith DD

doi

10.1021/jm9608164

subject

Has Abstract

pub_date

1997-09-12 00:00:00

pages

3071-6

issue

19

eissn

0022-2623

issn

1520-4804

pii

jm9608164

journal_volume

40

pub_type

杂志文章

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