title: Two novel membrane proteins, TcpD and TcpE, are essential for conjugative transfer of pCW3 in Clostridium perfringens.
abstract: The anaerobic pathogen Clostridium perfringens encodes either toxin genes or antibiotic resistance determinants on a unique family of conjugative plasmids that have a novel conjugation region, the tcp locus. Studies of the paradigm conjugative plasmid from C. perfringens, the 47-kb tetracycline resistance plasmid pCW3, have identified several tcp-encoded proteins that are involved in conjugative transfer and form part of the transfer apparatus. In this study, the role of the conserved hypothetical proteins TcpD, TcpE, and TcpJ was examined. Mutation and complementation analyses showed that TcpD and TcpE were essential for the conjugative transfer of pCW3, whereas TcpJ was not required. To analyze the TcpD and TcpE proteins in C. perfringens, functional hemagglutinin (HA)-tagged derivatives were constructed. Western blots showed that TcpD and TcpE localized to the cell envelope fraction independently of the presence of other pCW3-encoded proteins. Finally, examination of the subcellular localization of TcpD and TcpE by immunofluorescence showed that these proteins were concentrated at both poles of C. perfringens donor cells, where they are postulated to form essential components of the multiprotein complex that comprises the transfer apparatus.
authors.affiliation: Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Department of Microbiology, Monash University, Clayton, Victoria, Australia.
authors.forename: Jessica A
authors.initials: JA
authors.lastname: Wisniewski
authors.affiliation: Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Department of Microbiology, Monash University, Clayton, Victoria, Australia.
authors.forename: Wee L
authors.initials: WL
authors.lastname: Teng
authors.affiliation: Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Department of Microbiology, Monash University, Clayton, Victoria, Australia.
authors.forename: Trudi L
authors.initials: TL
authors.lastname: Bannam
authors.affiliation: Australian Research Council Centre of Excellence in Structural and Functional Microbial Genomics, Department of Microbiology, Monash University, Clayton, Victoria, Australia julian.rood@monash.edu.
authors.forename: Julian I
authors.identifier: http://orcid.org/0000-0003-2126-7209
authors.initials: JI
authors.lastname: Rood
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D003016:Clostridium perfringens / Q000235:genetics / Q000378:metabolism*; D003227:Conjugation, Genetic; D022761:Gene Transfer, Horizontal; D010957:Plasmids / Q000235:genetics* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins