Lovastatin insensitive 1, a novel pentatricopeptide repeat protein, is a potential regulatory factor of isoprenoid biosynthesis in Arabidopsis

Keiko Kobayashi, Masashi Suzuki, Jianwei Tang, Noriko Nagata, Kiyoshi Ohyama, Hikaru Seki, Reiko Kiuchi, Yasuko Kaneko, Miki Nakazawa, Minami Matsui, Shogo Matsumoto, Shigeo Yoshida, Toshiya Muranaka

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)
1 Downloads (Pure)

Abstract

Higher plants have two metabolic pathways for isoprenoid biosynthesis: the cytosolic mevalonate (MVA) pathway and the plastidal non-mevalonate (MEP) pathway. Despite the compartmentalization of these two pathways, metabolic flow occurs between them. However, little is known about the mechanisms that regulate the two pathways and the metabolic cross-talk. To identify such regulatory mechanisms, we isolated and characterized the Arabidopsis T-DNA insertion mutant lovastatin insensitive 1 (loi1), which is resistant to lovastatin and clomazone, inhibitors of the MVA and MEP pathways, respectively. The accumulation of the major products of these pathways, i.e. sterols and chlorophyll, was less affected by lovastatin and clomazone, respectively, in loi1 than in the wild type. Furthermore, the 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGR) activity analysis showed higher activity of HMGR in loi1-1 treated with lovastatin than that in the WT. We consider that the lovastatin-resistant phenotype of loi1-1 was derived from this post-transcriptional up-regulation of HMGR. The LOI1 gene encodes a novel pentatricopeptide repeat (PPR) protein. PPR proteins are thought to regulate the expression of genes encoded in organelle genomes by post-transcriptional regulation in mitochondria or plastids. Our results demonstrate that LOI1 is predicted to localize in mitochondria and has the ability to bind single-stranded nucleic acids. Our investigation revealed that the post-transcriptional regulation of mitochondrial RNA may be involved in isoprenoid biosynthesis in both the MVA and MEP pathways.

Original languageEnglish
Pages (from-to)322-331
Number of pages10
JournalPlant and Cell Physiology
Volume48
Issue number2
DOIs
Publication statusPublished - Feb 2007
Externally publishedYes

Keywords*

  • 3-Hydroxy-3-methylglutaryl coenzyme A reductase (HMGR)
  • Arabidopsis
  • Isoprenoid biosynthesis
  • Lovastatin
  • Mevalonate (MVA) pathway
  • Pentatricopeptide repeat (PPR)

Field of Science*

  • 1.6 Biological sciences

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database

Fingerprint

Dive into the research topics of 'Lovastatin insensitive 1, a novel pentatricopeptide repeat protein, is a potential regulatory factor of isoprenoid biosynthesis in Arabidopsis'. Together they form a unique fingerprint.

Cite this