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Closed Access item Identification of Residues within Two Regions Involved in Self-association of Viral Histone-like Protein p6 from Phage Ø29

Authors:Abril, Ana M.
Salas, Margarita
Hermoso, José Miguel
Issue Date:26-May-2000
Publisher:American Society for Biochemistry and Molecular Biology
Citation:Journal of Biological Chemistry 275: 26404-26410 (2000)
Abstract:Protein p6 of Bacillus subtilis phage Ø29 is involved in the initiation of viral DNA replication and transcription by forming a multimeric nucleoprotein complex with the phage DNA. Based on this, together with its abundance and its capacity to bind to the whole viral genome, it has been proposed to be a viral histone-like protein. Protein p6 is in a monomer-dimer-oligomer equilibrium association. We have identified protein p6 mutants deficient in self-association by testing random mutants obtained by degenerated polymerase chain reaction in an in vivo assay for dimer formation. The mutations were mainly clustered in two regions located at the N terminus, and the central part of the protein. Site-directed single mutants, corresponding to those found in vivo, have been constructed and purified. Mutant p6A44V, located at the central part of the protein, showed an impaired dimer formation ability, and a reduced capacity to bind DNA and to activate the initiation of Ø29 DNA replication. Mutant p6I8T has at least 10-fold reduced self-association capacity, does not bind DNA nor activate Ø29 DNA initiation of replication. C-terminal deletion mutants showed an enhanced dimer formation capacity. The highly acidic tail, removed in these mutants, is proposed to modulate the protein p6 self-association.
Publisher version (URL):http://dx.doi.org/10.1074/jbc.M002739200
URI:http://hdl.handle.net/10261/39039
ISSN:0021-9258
E-ISSNmetadata.dc.identifier.doi = DOI:1083-351X
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Appears in Collections:(CBM) Artículos

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