The nuclear encoded subunits gamma, delta and epsilon from the shrimp mitochondrial F1-ATP synthase, and their transcriptional response during hypoxia

Oliviert Martinez-Cruz, Aldo Arvizu-Flores, Rogerio R. Sotelo-Mundo, Adriana Muhlia-Almazan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The mitochondrial FOF1 ATP synthase produces ATP in a reaction coupled to an electrochemical proton gradient generated by the electron transfer chain. The enzyme also hydrolyzes ATP according to the energy requirements of the organism. Shrimp need to overcome low oxygen concentrations in water and other energetic stressors, which in turn lead to mitochondrial responses. The aim of this study was to characterize the full-length cDNA sequences of three subunits that form the central stalk of the F1 catalytic domain of the ATP synthase of the white shrimp Litopenaeus vannamei and their deduced proteins. The effect of hypoxia on shrimp was also evaluated by measuring changes in the mRNA amounts of these subunits. The cDNA sequences of the nucleus-encoded ATPγ, ATPδ and ATPε subunits are 1382, 477 and 277 bp long, respectively. The three deduced amino acid sequences exhibited highly conserved regions when compared to homologous sequences, and specific substitutions found in shrimp subunits are discussed through an homology structural model of F1 ATP-synthase that included the five deduced proteins, which confirm their functional structures and specific characteristics from the cognate complex of ATP synthases. Genes expression was evaluated during hypoxia-reoxygenation, and resulted in a generalized down-regulation of the F1 subunits and no coordinated changes were detected among these five subunits. The reduced mRNA levels suggest a mitochondrial response to an oxidative stress event, similar to that observed at ischemia-reperfusion in mammals. This model analysis and responses to hypoxia-reoxygenation may help to better understand additional mitochondrial adaptive mechanisms.

Original languageEnglish
Pages (from-to)223-234
Number of pages12
JournalJournal of Bioenergetics and Biomembranes
Volume47
Issue number3
DOIs
StatePublished - 1 Jun 2015

Bibliographical note

Publisher Copyright:
© 2015, Springer Science+Business Media New York.

Keywords

  • F ATP-synthase
  • Genes
  • Hypoxia
  • Nuclear subunits
  • Shrimp

Fingerprint

Dive into the research topics of 'The nuclear encoded subunits gamma, delta and epsilon from the shrimp mitochondrial F1-ATP synthase, and their transcriptional response during hypoxia'. Together they form a unique fingerprint.

Cite this