Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice.
BACKGROUND: Bacteriophages specific for Yersinia pestis are routinely used for plague diagnostics and could be an alternative to antibiotics in case of drug-resistant plague. A major concern of bacteriophage therapy is the emergence of phage-resistant mutants. The use of phage cocktails can overcome...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2011-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3182234?pdf=render |
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| author | Andrey A Filippov Kirill V Sergueev Yunxiu He Xiao-Zhe Huang Bryan T Gnade Allen J Mueller Carmen M Fernandez-Prada Mikeljon P Nikolich |
| author_facet | Andrey A Filippov Kirill V Sergueev Yunxiu He Xiao-Zhe Huang Bryan T Gnade Allen J Mueller Carmen M Fernandez-Prada Mikeljon P Nikolich |
| author_sort | Andrey A Filippov |
| collection | DOAJ |
| description | BACKGROUND: Bacteriophages specific for Yersinia pestis are routinely used for plague diagnostics and could be an alternative to antibiotics in case of drug-resistant plague. A major concern of bacteriophage therapy is the emergence of phage-resistant mutants. The use of phage cocktails can overcome this problem but only if the phages exploit different receptors. Some phage-resistant mutants lose virulence and therefore should not complicate bacteriophage therapy. METHODOLOGY/PRINCIPAL FINDINGS: The purpose of this work was to identify Y. pestis phage receptors using site-directed mutagenesis and trans-complementation and to determine potential attenuation of phage-resistant mutants for mice. Six receptors for eight phages were found in different parts of the lipopolysaccharide (LPS) inner and outer core. The receptor for R phage was localized beyond the LPS core. Most spontaneous and defined phage-resistant mutants of Y. pestis were attenuated, showing increase in LD₅₀ and time to death. The loss of different LPS core biosynthesis enzymes resulted in the reduction of Y. pestis virulence and there was a correlation between the degree of core truncation and the impact on virulence. The yrbH and waaA mutants completely lost their virulence. CONCLUSIONS/SIGNIFICANCE: We identified Y. pestis receptors for eight bacteriophages. Nine phages together use at least seven different Y. pestis receptors that makes some of them promising for formulation of plague therapeutic cocktails. Most phage-resistant Y. pestis mutants become attenuated and thus should not pose a serious problem for bacteriophage therapy of plague. LPS is a critical virulence factor of Y. pestis. |
| first_indexed | 2024-12-19T08:03:33Z |
| format | Article |
| id | doaj.art-3c31fa8540d64ad29e762d5e6e864841 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-19T08:03:33Z |
| publishDate | 2011-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-3c31fa8540d64ad29e762d5e6e8648412022-12-21T20:29:47ZengPublic Library of Science (PLoS)PLoS ONE1932-62032011-01-0169e2548610.1371/journal.pone.0025486Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice.Andrey A FilippovKirill V SergueevYunxiu HeXiao-Zhe HuangBryan T GnadeAllen J MuellerCarmen M Fernandez-PradaMikeljon P NikolichBACKGROUND: Bacteriophages specific for Yersinia pestis are routinely used for plague diagnostics and could be an alternative to antibiotics in case of drug-resistant plague. A major concern of bacteriophage therapy is the emergence of phage-resistant mutants. The use of phage cocktails can overcome this problem but only if the phages exploit different receptors. Some phage-resistant mutants lose virulence and therefore should not complicate bacteriophage therapy. METHODOLOGY/PRINCIPAL FINDINGS: The purpose of this work was to identify Y. pestis phage receptors using site-directed mutagenesis and trans-complementation and to determine potential attenuation of phage-resistant mutants for mice. Six receptors for eight phages were found in different parts of the lipopolysaccharide (LPS) inner and outer core. The receptor for R phage was localized beyond the LPS core. Most spontaneous and defined phage-resistant mutants of Y. pestis were attenuated, showing increase in LD₅₀ and time to death. The loss of different LPS core biosynthesis enzymes resulted in the reduction of Y. pestis virulence and there was a correlation between the degree of core truncation and the impact on virulence. The yrbH and waaA mutants completely lost their virulence. CONCLUSIONS/SIGNIFICANCE: We identified Y. pestis receptors for eight bacteriophages. Nine phages together use at least seven different Y. pestis receptors that makes some of them promising for formulation of plague therapeutic cocktails. Most phage-resistant Y. pestis mutants become attenuated and thus should not pose a serious problem for bacteriophage therapy of plague. LPS is a critical virulence factor of Y. pestis.http://europepmc.org/articles/PMC3182234?pdf=render |
| spellingShingle | Andrey A Filippov Kirill V Sergueev Yunxiu He Xiao-Zhe Huang Bryan T Gnade Allen J Mueller Carmen M Fernandez-Prada Mikeljon P Nikolich Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice. PLoS ONE |
| title | Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice. |
| title_full | Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice. |
| title_fullStr | Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice. |
| title_full_unstemmed | Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice. |
| title_short | Bacteriophage-resistant mutants in Yersinia pestis: identification of phage receptors and attenuation for mice. |
| title_sort | bacteriophage resistant mutants in yersinia pestis identification of phage receptors and attenuation for mice |
| url | http://europepmc.org/articles/PMC3182234?pdf=render |
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