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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Preparation of functional human lysophosphatidic acid receptor 2 using a P9 ∗ expression system and an amphipathic polymer and investigation of its in vitro binding preference to G α proteins.
Human lysophosphatidic acid receptor 2 (LPA2 ), a member of the G-protein coupled receptor family, mediates lysophosphatidic acid (LPA)-dependent signaling by recruiting various G proteins. Particularly, it is directly implicated in the progression of colorectal and ovarian cancer through G protein signaling cascades. To investigate the biochemical binding properties of LPA2 against various alpha subunits of G protein (Gα ), a functional recombinant LPA2 was overexpressed in E. coli membrane with a P9∗ expression system, and the purified protein was stabilized with an amphipathic polymer that had been synthesized by coupling octylamine, glucosamine, and diethyl aminoproylamine at the carboxylic groups of poly-γ-glutamic acid. The purified LPA2 stabilized with the amphipathic polymer showed selective binding activity to the various Gα proteins as well as agonist-dependent dissociation from Gαi3 . Understanding the binding properties of LPA2 against various Gα proteins advances the understanding of downstream signaling cascades of LPA2 . The functional LPA2 prepared using a P9∗ expression system and an amphipathic polymer could also facilitate the development of LPA2 -targeting drugs.
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