Obestatin conformational features: a strategy to unveil obestatin's biological role?
Obestatin and its derivative Ob(11-23) are recently discovered peptides produced in the rat stomach. They have proven to be involved in the regulation of energy balance, inhibiting feeding, causing reductions in food intake, body weight and jejunal contraction in rodents. The G-protein coupled receptor, GPR39, was originally proposed as being an obestatin target receptor, but this remains controversial. As such, the molecular mechanism for obestatin's effects in vivo is still uncertain. Here we report the CD and NMR conformational analysis of obestatin and Ob(11-23). Both peptides assume a regular secondary structure in the C-terminal region of the molecule. In this region, structural elements similar to other GPCR binding neuropeptides support the identity of obestatin as a new and functionally autonomous GPCR ligand. Conversely sequence and conformational specificity point to a new farmacoforic structure, on which innovative derivatives with a potential role in the treatment of obesity can be designed and synthetized.
Scrima
Mario
M
Department of Pharmaceutical Sciences, University of Salerno, I-84084 Fisciano, Italy.
Campiglia
Pietro
P
Esposito
Cinzia
C
Gomez-Monterrey
Isabel
I
Novellino
Ettore
E
D'Ursi
Anna Maria
AM
D000595:Amino Acid Sequence; D000818:Animals; D002942:Circular Dichroism; D054439:Ghrelin / Q000737:chemistry* / Q000502:physiology; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010446:Peptide Fragments / Q000737:chemistry*; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D051381:Rats
D054439:Ghrelin; D010446:Peptide Fragments