Light-Dependent Cytoplasmic Recruitment Enhances the Dynamic Range of a Nuclear Import Photoswitch.


Journal Article

Cellular signal transduction is often regulated at multiple steps to achieve more complex logic or precise control of a pathway. For instance, some signaling mechanisms couple allosteric activation with localization to achieve high signal to noise. Here, we create a system for light-activated nuclear import that incorporates two levels of control. It consists of a nuclear import photoswitch, light-activated nuclear shuttle (LANS), and a protein engineered to preferentially interact with LANS in the dark, Zdk2. First, Zdk2 is tethered to a location in the cytoplasm that sequesters LANS in the dark. Second, LANS incorporates a nuclear localization signal (NLS) that is sterically blocked from binding to the nuclear import machinery in the dark. If activated with light, LANS both dissociates from its tethered location and exposes its NLS, which leads to nuclear accumulation. We demonstrate that this coupled system improves the dynamic range of LANS in mammalian cells, yeast, and Caenorhabditis elegans and provides tighter control of transcription factors that have been fused to LANS.

Full Text

Cited Authors

  • Yumerefendi, H; Wang, H; Dickinson, DJ; Lerner, AM; Malkus, P; Goldstein, B; Hahn, K; Kuhlman, B

Published Date

  • June 2018

Published In

Volume / Issue

  • 19 / 12

Start / End Page

  • 1319 - 1325

PubMed ID

  • 29446199

Pubmed Central ID

  • 29446199

Electronic International Standard Serial Number (EISSN)

  • 1439-7633

International Standard Serial Number (ISSN)

  • 1439-4227

Digital Object Identifier (DOI)

  • 10.1002/cbic.201700681


  • eng