Journal
CHEMICAL BIOLOGY & DRUG DESIGN
Volume 75, Issue 1, Pages 40-50Publisher
WILEY
DOI: 10.1111/j.1747-0285.2009.00913.x
Keywords
CD36; conformational constraint; cyclic sulfamidate; Freidinger-Veber lactam; GHRP-6; GHS-R1a; lactam; lactam scanning; peptide; peptidomimetic; solid-phase synthesis
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Universite de Montreal, Canadian Institutes of Health Research [CIP-79 848]
- CIHR-Team in GPCR allosteric regulation (CTiGAR)
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (FQRNT)
- The Ministre du Developpement Economique
- de l'Innovation et de l'Exportation du Quebec
- Canadian Foundation
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Incorporation of amino lactams into biologically active peptides restricts conformational mobility and may enhance selectivity and increase potency. alpha- and beta-amino gamma-lactams (Agl and Bgl), in both S and R configurations, were introduced into the growth hormone secretagogue GHRP-6 using a Fmoc-compatible solid-phase protocol relying on N-alkylation with five- and six-membered cyclic sulfamidates, followed by lactam annulation under microwave heating. Using this protocol in conjunction with IRORI KanTM techniques furnished eleven new GHRP-6 analogs, and their binding affinity IC50 values on both the growth hormone secretagogue receptor 1a (GHS-R1a) and CD36 receptors are herein reported. The results indicate that selectivity towards one receptor or the other can be modulated by lactam substitution, typically at the Ala3 and the d-Phe5 positions.
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