Non-specific phospholipase C3 is involved in endoplasmic reticulum stress tolerance in Arabidopsis

Author:

Ngo Anh H12,Angkawijaya Artik Elisa1,Nakamura Yuki123ORCID,Kanehara Kazue2

Affiliation:

1. RIKEN Center for Sustainable Resource Science (CSRS) , Yokohama , Japan

2. Institute of Plant and Microbial Biology , Academia Sinica, Taipei , Taiwan

3. Department of Biological Sciences, Graduate School of Science, The University of Tokyo , Tokyo , Japan

Abstract

Abstract Non-specific phospholipase C (NPC) is an emerging family of lipolytic enzymes unique to plants and bacteria that play crucial roles in growth and stress responses. Among six copies of NPC isoforms found in Arabidopsis, the role of NPC3 remains elusive to date. Here, we show that NPC3 is a functional non-specific phospholipase C involved in tolerance to tunicamycin (TM)-induced endoplasmic reticulum (ER) stress through the synthesis of phosphocholine (PCho), a reaction product of NPC3. The npc3 mutant exhibited reduced sensitivity to TM treatment. Recombinant NPC3 possessed pronounced phospholipase C activity that hydrolyses phosphatidylcholine (PC). The hyposensitivity of npc3 to TM treatment was complemented by exogenous PCho, suggesting that NPC3-catalysed PCho production is involved in TM-induced ER stress tolerance. NPC3 was localized at the ER and was predominantly expressed in the roots, and it was further induced by TM-induced ER stress. Intriguingly, npc3 mutants showed a markedly reduced PCho content in shoots under ER stress. Our results indicate that ER stress induces NPC3 to produce PCho, which is involved in TM-induced ER stress tolerance.

Funder

Career Development

Academia Sinica

Institute of Plant and Microbial Biology

Research Scholar Fellowship

National Science and Technology Council, Taiwan

Japan Society for the Promotion of Science

Publisher

Oxford University Press (OUP)

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