Journal
CELL
Volume 174, Issue 4, Pages 917-+Publisher
CELL PRESS
DOI: 10.1016/j.cell.2018.06.013
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Funding
- University of California San Francisco Program for Breakthrough in Biomedical Research - Sandler Foundation
- NIH Office of the Director Early Independence Award [DP5-OD021344]
- NIH [P20GM103500, P30GM110732, R01GM110270, R01GM108888, R21 AI130670]
- National Science Foundation EPSCoR [EPS-110134]
- M. J. Murdock Charitable Trust
- Montana State University Agricultural Experimental Station (USDA NIFA)
- Amgen
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [T32AI060537, R21AI130670] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM110270, R01GM108888, T32GM007810, P20GM103500, P30GM110732] Funding Source: NIH RePORTER
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [DP5OD021344] Funding Source: NIH RePORTER
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Bacteria utilize CRISPR-Cas adaptive immune systems for protection from bacteriophages (phages), and some phages produce anti-CRISPR (Acr) proteins that inhibit immune function. Despite thorough mechanistic and structural information for some Acr proteins, how they are deployed and utilized by a phage during infection is unknown. Here, we show that Acr production does not guarantee phage replication when faced with CRISPR-Cas immunity, but instead, infections fail when phage population numbers fall below a critical threshold. Infections succeed only if a sufficient Acr does is contributed to a single cell by multiple phage genomes. The production of Acr proteins by phage genomes that fail to replicate leave the cell immunosuppressed, which predisposes the cell for successful infection by other phages in the population. This altruistic mechanism for CRISPR-Cas inhibition demonstrates inter-virus cooperation that may also manifest in other host-parasite interactions.
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