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Mammalian histones facilitate antimicrobial synergy by disrupting the bacterial proton gradient and chromosome organization

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9]
  1. Univ. of California, Irvine, CA (United States). Dept. of Developmental and Cell Biology; OSTI
  2. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  3. Univ. of California, Irvine, CA (United States). Dept. of Molecular Biology & Biochemistry
  4. Univ. of California, Irvine, CA (United States). Dept. of Materials Sciences and Engineering
  5. Univ. of California, Irvine, CA (United States). Dept. of Microbiology and Molecular Genetics
  6. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona (Spain). Cell Compartments and Signaling Group; Universitat de Barcelona (Spain). Faculty of Medicine. Dept. of Biomedical Sciences
  7. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona (Spain). Cell Compartments and Signaling Group; Universitat de Barcelona (Spain). Faculty of Medicine. Dept. of Biomedical Sciences; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona (Spain)
  8. Univ. of California, Irvine, CA (United States). Dept. of Developmental and Cell Biology; Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  9. Univ. of California, Irvine, CA (United States). Dept. of Developmental and Cell Biology; Univ. of California, Irvine, CA (United States). Dept. of Molecular Biology & Biochemistry
First proposed as antimicrobial agents, histones were later recognized for their role in condensing chromosomes. Histone antimicrobial activity has been reported in innate immune responses. However, how histones kill bacteria has remained elusive. The co-localization of histones with antimicrobial peptides (AMPs) in immune cells suggests that histones may be part of a larger antimicrobial mechanism in vivo. Here we report that histone H2A enters E. coli and S. aureus through membrane pores formed by the AMPs LL-37 and magainin-2. H2A enhances AMP-induced pores, depolarizes the bacterial membrane potential, and impairs membrane recovery. Inside the cytoplasm, H2A reorganizes bacterial chromosomal DNA and inhibits global transcription. Whereas bacteria recover from the pore-forming effects of LL-37, the concomitant effects of H2A and LL-37 are irrecoverable. Their combination constitutes a positive feedback loop that exponentially amplifies their antimicrobial activities, causing antimicrobial synergy. More generally, treatment with H2A and the pore-forming antibiotic polymyxin B completely eradicates bacterial growth.
Research Organization:
Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1817134
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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