May play a role in abscisic acid (ABA) signaling. May interact (via C-terminus) with GPA1. No visible phenotype under normal growth conditions. However, in growth conditions described in PubMed:17347412 mutant plants have decreased sensitivity to abscisic acid (ABA). Belongs to the LanC-like protein family. Was originally described as a plasma membrane G-protein coupled receptor (GPCR) that binds ABA. Binding of ABA to GCR2 results in the release of G protein and dissociation of the heterotrimeric complex to activate downstream ABA effectors and to trigger the ABA responses (PubMed:17347412). However, GCR2 has been controversial with respect to the reproducibility of the results (PubMed:17894782, PubMed:18714360 and PubMed:19286934). Moreover, GCR2 lacks the prototypical seven transmembrane domains of GPCRs, and is homologous to mammalian lanthionine synthetase C-like (LANCL) proteins (PubMed:17991845). Intriguingly, it was shown that human granulocytes and insulin-producing rat insulinoma cells release ABA, and that LANCL2 is necessary for ABA binding and signaling in these cells (PubMed:19667068). Truncated N-terminus.