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J Pept Sci. 2013 Sep;19(9):598-605. doi: 10.1002/psc.2538. Epub 2013 Jul 26.

A novel glucagon-like peptide 1 peptide identified from Ophisaurus harti.

Author information

1
Institutes for Advanced Interdisciplinary Research, East China Normal University, 3663 N. Zhongshan Road, Shanghai 200062, China.

Abstract

Glucagon-like peptide 1 receptor (GLP1R) is a promising target for the treatment of type 2 diabetes. Because of the short half-life of endogenous GLP1 peptide, other GLP1R agonists are considered to be appealing therapeutic candidates. A high-throughput assay has been established to screen for GLP1R agonists in a 60 000-well natural product compound library fractionated from 670 different herbs/materials widely used in traditional Chinese medicines (TCMs). The screening is based on primary screen of GLP1R⁺ reporter gene assay with the counter screen in GLP1R⁻ cell line. An active fraction, A089-147, was identified from the screening. Fraction A089-147 was isolated from dried Ophisaurus harti, and the fact that its GLP1R agonist activity was sensitive to trypsin treatment indicates its peptidic nature. The active ingredient of A089-147 was later identified as O. harti GLP1 through transcriptome analysis. Chemically synthesized O. harti GLP1 showed GLP1R agonist activity and sensitivity to dipeptidase IV digestion. This study illustrated a comprehensive screening strategy to identify novel GLP1R agonists from TCMs libraries and at the same time underlined the difficulty of identifying a non-peptidic GLP1R agonist. The novel O. harti GLP1 peptide yielded from this study confirmed broader application of TCMs libraries in active peptide identification.

KEYWORDS:

GLP1; GLP1R; High throughput screening; Ophisaurus harti; TCM; transcriptome; type 2 diabetes

PMID:
23893560
DOI:
10.1002/psc.2538
[Indexed for MEDLINE]

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