title: Peptidomimetics in the discovery of new insect growth regulators: studies on the structure-activity relationships of the core pentapeptide region of allatostatins.
abstract: Cockroach-type allatostatins (ASTs) were discovered in cockroaches through their capacity to inhibit the production of juvenile hormone by the corpora allata (CA). ASTs were considered as potential insect growth regulator (IGR) candidates, but several disadvantages, including the absence of the effect in vivo and rapid degradation in vivo, precluded their application in pest management. The CA were selected as the target, and the core pentapeptide region (YDFGL) was chosen as the lead sequence in the search for new IGRs based on the allatostatins. We designed and synthesized 24 analogues, which mimicked each amino acid of the core region, to determine structure-activity relationships and the possibility of shortening the ASTs in the core region while retaining activity. The results suggest that the sequence FGLa is more important than Y/FX because Y/FX mimics show strong effects in vitro and in vivo. In particular, compound I3 was synthesized by substitution of Y/FX with 6-phenylhexnoic acid and exhibits higher activity in vitro than the complete core region. Furthermore, compound I3 has a clear effect in vivo on juvenile hormone (JH) biosynthesis of Diploptera punctata females, providing a possible application for cockroach management. On the basis of the structure-activity relationship of pentapeptide analogues, a general structure of potential potent AST analogues is proposed here. A new approach using peptidomimetics in the discovery of IGRs is demonstrated in our study.
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, People's Republic of China.
authors.forename: Zhen-peng
authors.initials: ZP
authors.lastname: Kai
authors.forename: Yong
authors.initials: Y
authors.lastname: Xie
authors.forename: Juan
authors.initials: J
authors.lastname: Huang
authors.forename: Stephen S
authors.initials: SS
authors.lastname: Tobe
authors.forename: Jin-rui
authors.initials: JR
authors.lastname: Zhang
authors.forename: Yun
authors.initials: Y
authors.lastname: Ling
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Yi-chen
authors.initials: YC
authors.lastname: Zhao
authors.forename: Xin-ling
authors.initials: XL
authors.lastname: Yang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003058:Cockroaches / Q000187:drug effects / Q000502:physiology; D005260:Female; D007605:Juvenile Hormones / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D008297:Male; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009479:Neuropeptides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D009842:Oligopeptides / Q000737:chemistry* / Q000494:pharmacology*; D057786:Peptidomimetics / Q000737:chemistry*; D013329:Structure-Activity Relationship
chemical_list: D007605:Juvenile Hormones; D009479:Neuropeptides; D009842:Oligopeptides; D057786:Peptidomimetics; C076523:allatostatin