2rmi

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Template:STRUCTURE 2rmi

3D NMR structure of astressin

Overview

The C-terminally amidated CRF antagonist astressin binds to CRF-R1 or CRF-R2 receptors with low nanomolar affinity while the corresponding astressin-acid has >100 times less affinity. To understand the role of the amide group in binding, the conformations of astressin-amide and astressin-acid were studied in DMSO using NMR techniques. The 3D NMR structures show that the backbones of both analogs prefer an alpha-helical conformation, with a small kink around Gln(26). However, astressin-amide has a well-defined helical structure from Leu(27) to Ile(41) and a conformation very similar to the bioactive conformation reported by our group (Grace et al., Proc Natl Acad Sci USA 2007, 104, 4858-4863). In contrast, astressin-acid has an irregular helical conformation from Arg(35) onward, including a rearrangement of the side chains in that region. This structural difference highlights the crucial role of the C-terminal amidation for stabilization of astressin's bioactive conformation.

About this Structure

2RMI is a Single protein structure. Full crystallographic information is available from OCA.

Reference

Astressin-amide and astressin-acid are structurally different in dimethylsulfoxide., Grace CR, Cervini L, Gulyas J, Rivier J, Riek R, Biopolymers. 2007 Oct 5-15;87(2-3):196-205. PMID:17657708 Page seeded by OCA on Sun May 4 17:10:34 2008