Characterisation and pharmacological analysis of a crustacean G protein-coupled receptor: the red pigment-concentrating hormone receptor of Daphnia pulex.

Abstract:

:This is the first pharmacological characterisation of a neuropeptide G protein-coupled receptor (GPCR) in a crustacean. We cloned the ORF of the red pigment-concentrating hormone from a German strain of Daphnia pulex (Dappu-RPCH), as well as that of the cognate receptor (Dappu-RPCHR). Dappu-RPCHR has the hallmarks of the rhodopsin superfamily of GPCRs, and is more similar to insect adipokinetic hormone (AKH) receptor sequences than to receptor sequences for AKH/corazonin-like peptide or corazonin. We provide experimental evidence that Dappu-RPCH specifically activates the receptor (EC50 value of 65 pM) in a mammalian cell-based bioluminescence assay. We further characterised the properties of the ligands for the Dappu-RPCHR by investigating the activities of a variety of naturally-occurring peptides (insect AKH and crustacean RPCH peptides). The insect AKHs had lower EC50 values than the crustacean RPCHs. In addition, we tested a series of Dappu-RPCH analogues, where one residue at a time is systematically replaced by an alanine to learn about the relative importance of the termini and side chains for activation. Mainly amino acids in positions 1 to 4 and 8 of Dappu-RPCH appear responsible for effective activation of Dappu-RPCHR. The substitution of Phe4 in Dappu-RPCH had the most damaging effect on its agonistic activity.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Marco HG,Verlinden H,Vanden Broeck J,Gäde G

doi

10.1038/s41598-017-06805-9

subject

Has Abstract

pub_date

2017-07-31 00:00:00

pages

6851

issue

1

issn

2045-2322

pii

10.1038/s41598-017-06805-9

journal_volume

7

pub_type

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