Cor interacts with outer membrane proteins to exclude FhuA-dependent phages
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Superinfection exclusion (Sie) of FhuA-dependent phages is carried out by Cor in the Escherichia coli mEp167 prophage lysogenic strain. In this work, we present evidence that Cor is an outer membrane (OM) lipoprotein that requires the participation of additional outer membrane proteins (OMPs) to exclude FhuA-dependent phages. Two Cor species of ~13 and ~8.5 kDa, corresponding to the preprolipoprotein/prolipoprotein and lipoprotein, were observed by Western blot. Cell mutants for CorC17F, CorA18D and CorA57E lost the Sie phenotype for FhuA-dependent phages. A copurification affinity binding assay combined with LC_ESI_MS/MS showed that Cor bound to OMPs: OmpA, OmpC, OmpF, OmpW, LamB, and Slp. Interestingly, Sie for FhuA-dependent phages was reduced on Cor overexpressing FhuA+ mutant strains, where ompA, ompC, ompF, ompW, lamB, fhuE, genes were knocked out. The exclusion was restored when these strains were supplemented with plasmids expressing these genes. Sie was not lost in other Cor overexpressing FhuA+ null mutant strains JW3938(btuB-), JW5100(tolB-), JW3474(slp-). These results indicate that Cor interacts and requires some OMPs to exclude FhuA-dependent phages.
We especially thank the National Institute of Genetics (Japan) and Dr. Dimitris Georgellis for providing us BW25113 and the derivative knockout mutant strains (Keio Collection), and their corresponding plasmids (ASKA Collection). We also thank Dr. Thomas Silhavy for providing us Anti-LamB antibody. To Dr. Rosa Ma. Bermúdez Cruz, Dr. Jaime Ortega López, and two unknown reviewers for their critical observations and enriching discussions. To M. Sc. María Guadalupe Aguilar González for her support with nucleic acid sequencing and M. Sc. Marco A. Magos-Castro and M. Sc. Juan Carlos Osorio for their technical assistance. To Gabriela Mora for helping us in the administrative labor. This work was supported by Secretaria de Ciencia, Tecnología e Innovación de la Ciudad de México (SECYTI-CDMX), grant no. PICSA 11-107. E.S.A.H. was granted by CONACyT Mexico fellowship no. 210176.
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Conflict of interest
Authors: Emma S. Arguijo-Hernández, Javier Hernandez-Sanchez, Saida J. Briones-Peña, Norma Oviedo, Gabriel Guarneros and Luis Kameyama declare that have no conflicts of interest. Author: Guillermo Mendoza-Hernández passed away.
This article does not contain any studies with animals or human participants performed by any of the authors.
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