Light‐Dependent Cytoplasmic Recruitment Enhances the Dynamic Range of a Nuclear Import Photoswitch
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 06, 2018
- Source ID
- 10.1002/cbic.201700681
Entities
People
- Andrew M. Lerner
- Bob Goldstein
- Brian Kuhlman
- Daniel J. Dickinson
- Hayretin Yumerefendi
- Hui Wang
- Klaus M Hahn
- Per Malkus
Organizations
- Duke University
- National Institutes of Health
- United States Department of Defense
- University of North Carolina at Chapel Hill
- University of Texas at Austin