Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 114, Issue 46, Pages 12225-12230Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1711285114
Keywords
chromosome structure; DNA-RNA interaction; noncoding RNA; Escherichia coli; HU protein
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Funding
- National Institutes of Health
- National Cancer Institute
- Center for Cancer Research
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Bacterial chromosome (nucleoid) conformation dictates faithful regulation of gene transcription. The conformation is condition-dependent and is guided by several nucleoid-associated proteins (NAPs) and at least one nucleoid-associated noncoding RNA, naRNA4. Here we investigated the molecular mechanism of how naRNA4 and the major NAP, HU, acting together organize the chromosome structure by establishing multiple DNA-DNA contacts (DNA condensation). We demonstrate that naRNA4 uniquely acts by forming complexes that may not involve long stretches of DNA-RNA hybrid. Also, uncommonly, HU, a chromosome-associated protein that is essential in the DNA-RNA interactions, is not present in the final complex. Thus, HU plays a catalytic (chaperone) role in the naRNA4-mediated DNA condensation process.
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