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A monomeric mycobacteriophage immunity repressor utilizes two domains to recognize an asymmetric DNA sequence

Journal Article · · Nature Communications
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [6];  [7];  [2];  [3];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Western Carolina University, Cullowhee, NC (United States)
  2. Middle Tennessee State Univ., Murfreesboro, TN (United States)
  3. Western Carolina University, Cullowhee, NC (United States)
  4. Univ. of Utah, Salt Lake City, UT (United States); Western Carolina University, Cullowhee, NC (United States)
  5. New Mexico Consortium, Los Alamos, NM (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Wake Forest Univ., Winston-Salem, NC (United States)
Regulation of bacteriophage gene expression involves repressor proteins that bind and downregulate early lytic promoters. A large group of mycobacteriophages code for repressors that are unusual in also terminating transcription elongation at numerous binding sites (stoperators) distributed across the phage genome. Here we provide the X-ray crystal structure of a mycobacteriophage immunity repressor bound to DNA, which reveals the binding of a monomer to an asymmetric DNA sequence using two independent DNA binding domains. The structure is supported by small-angle X-ray scattering, DNA binding, molecular dynamics, and in vivo immunity assays. We propose a model for how dual DNA binding domains facilitate regulation of both transcription initiation and elongation, while enabling evolution of other superinfection immune specificities.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Howard Hughes Medical Institute; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); Western Carolina University
Grant/Contract Number:
89233218CNA000001; AC02-05CH11231
OSTI ID:
1881826
Report Number(s):
LA-UR-22-22632
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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