Lang, Manja and De Pol, Silvia and Baldauf, Carsten and Hofmann, Hans-Jörg and Reiser, Oliver and Beck-Sickinger, Annette G. (2006) Identification of the Key Residue of Calcitonin Gene Related Peptide (CGRP) 27-37 to Obtain Antagonists with Picomolar Affinity at the CGRP Receptor. Journal of Medicinal Chemistry 49 (2), pp. 616-624.
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Other URL: http://dx.doi.org/10.1021/jm050613s
Calcitonin gene related peptide (CGRP) plays an important role in the CNS and in the cardiovascular system. To identify high-affinity antagonists in competitive binding studies, we identified a novel radioactive tracer, [³H-propionyl-K²⁴]-hαCGRP 8-37, which was labeled in solution by a recently developed strategy using photolabile protecting groups at reactive side chains. This tracer was shown to be as potent as commercially available 125I-tracers for the determination of agonists and to have increased sensitivity for antagonists. We applied it to investigate the predicted turn structures centered at Pro²⁹ and Pro³⁴. The substitution at positions 29 and 34 by turn-inducing amino acid mimetica showed that these turns are highly diverse. At position 29, a hydrophobic residue is preferred that constricts the secondary structure, whereas position 34 is required to stabilize the conformation of the backbone. All high-affinity analogues showed antagonistic properties with potency similar to CGRP 8-37.
|Date:||26 January 2006|
|Institutions:||Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Oliver Reiser|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Unknown|
|Owner:||Helge Knüttel (ADMIN)|
|Deposited On:||05 Sep 2006|
|Last Modified:||05 Aug 2009 13:22|