The shrimp mitochondrial FoF1-ATPase inhibitory factor 1 (IF1)

Cindy Chimeo, Analia Veronica Fernandez-Gimenez, Michelangelo Campanella, Ofelia Mendez-Romero, Adriana Muhlia-Almazan

Research output: Contribution to journalArticle

Abstract

The whiteleg shrimp species Litopenaeus vannamei is exposed to cyclic changes of the dissolved oxygen concentration of seawater and must neutralize the adverse effects of hypoxia by using ATP as energy source. In crustaceans, the mitochondrial FOF1-ATP synthase is pivotal to the homeostasis of ATP and function prevalently as a FOF1-ATPase. Hitherto, it is unknown whether these marine invertebrates are equipped with molecules able to control the FOF1-ATPase inhibiting the ATP consumption. In this study, we report two variants of the mitochondrial FOF1-ATPase Inhibitory Factor 1 (IF1) ubiquitously expressed across tissues of the Litopenaeus vannamei transcriptome: the IF1_Lv1 and the IF1_Lv2. The IF1_Lv1, with a full-length sequence of 550 bp, encodes a 104 aa long protein and its mRNA amounts are significantly affected by hypoxia and re-oxygenation. The IF1_Lv2, with a sequence of 654 bp, encodes instead for a protein of 85 aa. Both proteins share a 69 % homology and contain a conserved minimal inhibitory sequence (IATP domain) along with a G-rich region on their N-terminus typical of the invertebrate. In light of this characterization IF1 is here discussed as an adaptive mechanism evolved by this marine species to inhibit the FOF1-ATPase activity and avoid ATP dissipation to thrive in spite of the changes in oxygen tension.

Original languageEnglish
Pages (from-to)383-393
Number of pages11
JournalJournal of Bioenergetics and Biomembranes
Volume47
Issue number5
DOIs
Publication statusPublished - Aug 25 2015

Keywords

  • Hypoxia
  • IF, FF-ATPase
  • Inhibitor
  • Shrimp
  • Transcriptional regulation

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

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    Chimeo, C., Fernandez-Gimenez, A. V., Campanella, M., Mendez-Romero, O., & Muhlia-Almazan, A. (2015). The shrimp mitochondrial FoF1-ATPase inhibitory factor 1 (IF1). Journal of Bioenergetics and Biomembranes, 47(5), 383-393. https://doi.org/10.1007/s10863-015-9621-0