Title: Structure, stability, and biological activity of bacteriophage T4 gene product 9 probed with mutagenesis and monoclonal antibodies
Authors: Kurochkina, Lidia P ×
Vishnevskiy, Alexandr Yu
Zhemaeva, Lyuba V
Sykilinda, Nina N
Strelkov, Sergei
Mesyanzhinov, Vadim V #
Issue Date: May-2006
Series Title: Journal of structural biology vol:154 issue:2 pages:122-9
Abstract: Gene product (gp) 9 connects the long tail fibers and triggers the structural transition of T4 phage baseplate at the beginning of infection process. Gp9 is a parallel homotrimer with 288 amino acid residues per chain that forms three domains. To investigate the role of the gp9 amino terminus, we have engineered a set of mutants with deletions and random substitutions in this part. The structure of the mutants was probed using monoclonal antibodies that bind to either N-terminal, middle, or C-terminal domains. Deletions of up to 12 N-terminal residues as well as random substitutions of the second, third and fourth residues yielded trimers that failed to incorporate in vitro into the T4 9(-)-particles and were not able to convert them into infectious virions. As detected using monoclonal antibodies, these mutants undergo structural changes in both N-terminal and middle domains. Furthermore, deletion of the first twenty residues caused profound structural changes in all three gp9 domains. In addition, N-terminally truncated proteins and randomized mutants formed SDS-resistant "conformers" due to unwinding of the N-terminal region. Co-expression of the full-length gp9 and the mutant lacking first 20 residues clearly shows the assembly of heterotrimers, suggesting that the gp9 trimerization in vivo occurs post-translationally. Collectively, our data indicate that the aminoterminal sequence of gp9 is important to maintain a competent structure capable of incorporating into the baseplate, and may be also required at intermediate stages of gp9 folding and assembly.
ISSN: 1047-8477
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biocrystallography
× corresponding author
# (joint) last author

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