2GFR

Solution structure of Amphibian tachykinin Uperolein bound to DPC micelles

Summary for 2GFR

• Entry DOI: 10.2210/pdb2gfr/pdb
• Descriptor: Uperolein (1 entity in total)
• Functional Keywords: helix, 3-10 helix, lipid induced conformation, dpc micelles, neuropeptide
• Total number of polymer chains: 1
• Total formula weight: 1235.37

Authors

Dike, A.,Cowsik, S.M. (deposition date: 2006-03-23, release date: 2006-10-03, Last modification date: 2024-10-16)

Primary citation

Dike, A.,Cowsik, S.M.
Solution structure of amphibian tachykinin Uperolein bound to DPC micelles.
J.Struct.Biol., 156:442-452, 2006

PubMed Abstract: Uperolein, a physalaemin-like endecapeptide, has been shown to be selective for Neurokinin 1 receptor. As a first step towards understanding the structure-activity relationship, we report the membrane-induced structure of Uperolein with the aid of circular dichroism and 2D (1)H NMR spectroscopy. Sequence-specific resonance assignments of protons have been made using correlation spectroscopy (TOCSY, DQF-COSY) and NOESY spectroscopy. The interproton distance constraints and dihedral angle constraints have been utilized to generate a family of structures using torsion angle molecular dynamics within program DYANA. The conformational range of the peptide revealed by NMR and CD studies has been analysed in terms of characteristic secondary features. Analysis of NMR data indicates that the global fold of Uperolein can be explained in terms of equilibrium between 3(10)-helix and alpha-helix from residues 5 to 11. An extended highly flexible N-terminus displays some degree of order and a possible turn structure. A comparison between the structures of Uperolein and Substance P, a prototype and endogenous Neurokinin 1 receptor agonist, indicates several common features in the distribution of hydrophobic and hydrophilic residues. Both the peptides show an amphiphilic character towards the middle region. The similarities suggest that the molecules interact with the receptor in an analogous manner.

PubMed: 16979908
DOI: 10.1016/j.jsb.2006.07.006

Experimental method

SOLUTION NMR