The product of the bacteriophage lambdaWgene: purification and properties
| Autor: | Dimitra Tzamtzis, Marvin Gold, Helios Murialdo, Xuekun Xing, Abraham Haddad |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Viral Structural Proteins
Endodeoxyribonucleases Genes Viral biology Stereochemistry Chemistry DNA Recombinant Cell Biology Sulfur Radioisotopes biology.organism_classification Lambda Bacteriophage lambda Biochemistry Mass Spectrometry Bacteriophage Product (mathematics) Chromatography Gel Molecular Biology Gene Plasmids |
| Zdroj: | Biochemistry and Cell Biology. 81:307-315 |
| ISSN: | 1208-6002 0829-8211 |
| Popis: | Gene W is one of the 10 genes that control the morphogenesis of the bacteriophage λ head. The morpho genesis of the phage λ head proceeds through the synthesis of an intermediate assembly called the prohead. This is an empty shell into which the bacteriophage DNA is introduced packaged by the phage enzyme DNA terminase. The product of W (gpW) acts after DNA packaging, but before the addition of another phage product, gene product FII, and before the addition of tails. The role of gpW is unknown. The structure of N- and C-tagged gpW has been previously determined by nuclear magnetic resonance (NMR) spectroscopy. Here we report some of the properties of the native protein. The purification of gpW to homogeneity, overproduced by a plasmid derivative, is described. To obtain large amounts of the protein, the ribosome-binding site had to be modified, showing that inefficient translation of the message is the main mechanism limiting W gene expression. The molecular weight of the protein is in close agreement to the value predicted from the DNA sequence of the gene, which suggests that it is not post-transcriptionally modified. It behaves as a monomer in solution. Radioactively labeled gpW is incorporated into phage particles in in vitro complementation, showing that gpW is a structural protein. The stage at which gpW functions and other circumstantial evidence support the idea that six molecules of gpW polymerize on the connector before the incorporation of six molecules of gpFII and before the tail attaches.Key words: bacteriophage morphogenesis, lambda gene W, viral structure. |
| Databáze: | OpenAIRE |
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