Possible function of VIPP1 in thylakoids: Protection but not formation?

Lingang Zhang, Wataru Sakamoto

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

VIPP1 protein in photosynthetic organisms is homologous to bacterial PspA, which protects plasma membrane integrity upon stresses. Despite the proposed role of VIPP1 in thylakoid biogenesis, its precise function remains unclear. Recently, our in-depth analysis of Arabidopsis vipp1 mutants revealed VIPP1's involvement in the maintenance of chloroplast envelopes. Chloroplasts in intact vipp1 leaves exhibited spherical balloon-like morphology, which resulted from osmotic stress across envelopes. In fact, observation of VIPP1 fused to green fluorescence protein in vivo revealed that most VIPP1 is localized as a lattice-like macro complex attached along with the envelope. Because of the proposed function in thylakoids, we examined whether vipp1 also exhibited altered morphologies in thylakoids. Results show that thylakoid morphologies were detected irregularly, but vipp1 chloroplasts retained normal-appearing grana stacks. We infer that VIPP1 might influence thylakoids as well as envelopes, but that it is not involved directly in thylakoid membrane formation.

Original languageEnglish
JournalPlant Signaling and Behavior
Volume8
Issue number2
DOIs
Publication statusPublished - Feb 1 2013

Keywords

  • Arabidopsis
  • Chloroplast
  • Envelope membrane
  • Grana
  • Osmotic stress
  • PspA
  • Thylakoid biogenesis

ASJC Scopus subject areas

  • Plant Science

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