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J Biol Chem

Title:		"Backbone cyclic peptide antagonists, derived from the insect pheromone biosynthesis activating neuropeptide, inhibit sex pheromone biosynthesis in moths"
Author(s):		Altstein M; Ben-Aziz O; Daniel S; Schefler I; Zeltser I; Gilon C;
Address:		"Department of Entomology, The Volcani Center, Bet Dagan 50250, Israel"
Journal Title:		J Biol Chem
Year:		1999
Volume:		274
Issue:		25
Page Number:		17573 - 17579
DOI:		10.1074/jbc.274.25.17573
ISSN/ISBN:		0021-9258 (Print) 0021-9258 (Linking)
Abstract:		"We describe an application of the backbone cyclization and cycloscan concept for the design and synthesis of pheromone biosynthesis activating neuropeptide (PBAN) antagonists capable of inhibiting sex pheromone biosynthesis in Heliothis peltigera female moths. Two backbone cyclic (BBC) sub-libraries were designed and synthesized. The structure of the first sub-library ([Arg27]PBAN27-33NH2, termed the Ser sub-library) was based on the active C-terminal hexapeptide sequence (Tyr-Phe-Ser-Pro-Arg-Leu-NH2) of PBAN1-33NH2, which was found to comprise its active core. The second sub-library ([Arg27, D-Phe30]PBAN27-33NH2, termed the D-Phe sub-library) was based on the sequence of the lead antagonist Arg-Tyr-Phe-(D)Phe-Pro-Arg-Leu-NH2. In both sub-libraries the Pro residue was replaced by an Nalpha(omega-amino-alkyl)Gly building unit having various lengths of the alkyl chain. All the cyclic peptides in each sub-library had the same primary sequence and the same location of the ring. The members of each library differed from each other by the bridge size and bridge chemistry. Screening of the two libraries for pheromonotropic antagonists resulted in the disclosure of four compounds that fully inhibited sex pheromone biosynthesis at 1 nmol and were devoid of agonistic activity. All antagonistic peptides originated from the D-Phe sub-library. Substitution of the D-Phe30 amino acid with a Ser resulted in a loss of antagonistic activity. Agonistic activities were exhibited by peptides from both sub-libraries"
Keywords:		"Animals Drug Design Female Molecular Structure Moths/*drug effects Neuropeptides/*chemistry Peptide Library Peptides, Cyclic/*chemistry/pharmacology Pheromones/agonists/antagonists & inhibitors/*biosynthesis;"
Notes:		"MedlineAltstein, M Ben-Aziz, O Daniel, S Schefler, I Zeltser, I Gilon, C eng Research Support, Non-U.S. Gov't 1999/06/11 J Biol Chem. 1999 Jun 18; 274(25):17573-9. doi: 10.1074/jbc.274.25.17573"