A monomeric mycobacteriophage immunity repressor utilizes two domains to recognize an asymmetric DNA sequence
Journal Article
·
· Nature Communications
- Univ. of Michigan, Ann Arbor, MI (United States); Western Carolina University, Cullowhee, NC (United States)
- Middle Tennessee State Univ., Murfreesboro, TN (United States)
- Western Carolina University, Cullowhee, NC (United States)
- Univ. of Utah, Salt Lake City, UT (United States); Western Carolina University, Cullowhee, NC (United States)
- New Mexico Consortium, Los Alamos, NM (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- 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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