1. Chromosomes and Gene Expression
  2. Structural Biology and Molecular Biophysics
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The nucleosomal acidic patch relieves auto-inhibition by the ISWI remodeler SNF2h

  1. Nathan Gamarra
  2. Stephanie L Johnson
  3. Michael J Trnka
  4. Alma L Burlingame
  5. Geeta J Narlikar  Is a corresponding author
  1. University of California, San Francisco, United States
Research Article
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Cite this article as: eLife 2018;7:e35322 doi: 10.7554/eLife.35322

Abstract

ISWI family chromatin remodeling motors use sophisticated autoinhibition mechanisms to control nucleosome sliding. Yet how the different autoinhibitory domains are regulated is not well understood. Here we show that an acidic patch formed by histones H2A and H2B of the nucleosome relieves the autoinhibition imposed by the AutoN and the NegC regions of the human ISWI remodeler SNF2h. Further, by single molecule FRET we show that the acidic patch helps control the distance travelled per translocation event. We propose a model in which the acidic patch activates SNF2h by providing a landing pad for the NegC and AutoN auto-inhibitory domains. Interestingly, the acidic patch also inhibits the INO80 complex, indicating that this substrate feature can regulate remodeling enzymes with substantially different mechanisms. We therefore hypothesize that regulating access to the acidic patch of the nucleosome plays a key role in coordinating the activities of different remodelers in the cell.

Data availability

Relevant source data is provided in the main and supplemental figures. Crosslinked residue pair identification along with number of spectral counts per identification are reported in Supplemental File 1, as well as in a web resource with links to annotated product ion spectra (see Experimental Methods). Raw mass spectrometry files are available on the Massive server (UCSD). Code used for the analysis of smFRET data can be found at the following link, which is also found in the main text. https://github.com/stephlj/Traces

The following data sets were generated

Article and author information

Author details

  1. Nathan Gamarra

    Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, United States
    Competing interests
    No competing interests declared.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-2430-8662
  2. Stephanie L Johnson

    Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, United States
    Competing interests
    No competing interests declared.
  3. Michael J Trnka

    Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, United States
    Competing interests
    No competing interests declared.
  4. Alma L Burlingame

    Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, United States
    Competing interests
    No competing interests declared.
  5. Geeta J Narlikar

    Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, United States
    For correspondence
    Geeta.Narlikar@ucsf.edu
    Competing interests
    Geeta J Narlikar, Reviewing editor, eLife.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-1920-0147

Funding

Leukemia and Lymphoma Society (Carrer Development Program Fellow Award)

  • Stephanie L Johnson

National Science Foundation (Predoctoral Fellowship)

  • Nathan Gamarra

National Institute of General Medical Sciences (R01GM073767)

  • Geeta J Narlikar

Dr. Miriam and Sheldon G. Adelson Medical Research Foundation

  • Alma L Burlingame

University of California, San Francisco (Program for Breakthrough Biomedical Research (PBBR))

  • Alma L Burlingame

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Reviewing Editor

  1. Jerry L Workman, Stowers Institute for Medical Research, United States

Publication history

  1. Received: January 25, 2018
  2. Accepted: April 16, 2018
  3. Accepted Manuscript published: April 17, 2018 (version 1)
  4. Version of Record published: May 30, 2018 (version 2)
  5. Version of Record updated: August 10, 2018 (version 3)

Copyright

© 2018, Gamarra et al.

This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.

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