A chimera na+-Pump rhodopsin as an effective optogenetic silencer

Mohammad Razuanul Hoque, Toru Ishizuka, Keiichi Inoue, Rei Abe-Yoshizumi, Hiroyuki Igarashi, Takaaki Mishima, Hideki Kandori, Hiromu Yawo

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    10 Citations (Scopus)

    Abstract

    With the progress of optogenetics, the activities of genetically identified neurons can be optically silenced to determine whether the neurons in question are necessary for the network performance of the behavioral expression. This logical induction is expected to be improved by the application of the Na+ pump rhodopsins (NaRs), which hyperpolarize the membrane potential with negligible influence on the ionic/pH balance. Here, we made several chimeric NaRs between two NaRs, KR2 and IaNaR from Krokinobacter eikastus and Indibacter alkaliphilus, respectively. We found that one of these chimeras, named I1K6NaR, exhibited some improvements in the membrane targeting and photocurrent properties over native NaRs. The I1K6NaR-expressing cortical neurons were stably silenced by green light irradiation for a certain long duration. With its rapid kinetics and voltage dependency, the photoactivation of I1K6NaR would specifically counteract the generation of action potentials with less hyperpolarization of the neuronal membrane potential than KR2.

    Original languageEnglish
    Article numbere0166820
    JournalPloS one
    Volume11
    Issue number11
    DOIs
    Publication statusPublished - 2016 Nov

    ASJC Scopus subject areas

    • Biochemistry, Genetics and Molecular Biology(all)
    • Agricultural and Biological Sciences(all)
    • General

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    Hoque, M. R., Ishizuka, T., Inoue, K., Abe-Yoshizumi, R., Igarashi, H., Mishima, T., Kandori, H., & Yawo, H. (2016). A chimera na+-Pump rhodopsin as an effective optogenetic silencer. PloS one, 11(11), [e0166820]. https://doi.org/10.1371/journal.pone.0166820