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- W4210536547 abstract "Bacteriophage P4 is dependent on structural proteins supplied by a helper phage, P2, to assemble infectious virions. Bacteriophage P2 normally forms an icosahedral capsid with T = 7 symmetry from the gpN capsid protein, the gpO scaffolding protein and the gpQ portal protein. In the presence of P4, however, the same structural proteins are assembled into a smaller capsid with T = 4 symmetry. This size determination is effected by the P4-encoded protein Sid, which forms an external scaffold around the small P4 procapsids. Size responsiveness (sir) mutants in gpN fail to assemble small capsids even in the presence of Sid. We have produced large and small procapsids by co-expression of gpN with gpO and Sid, respectively, and applied cryo-electron microscopy and three-dimensional reconstruction methods to visualize these procapsids. gpN has an HK97-like fold and interacts with Sid in an exposed loop where the sir mutations are clustered. The T = 7 lattice of P2 has dextro handedness, unlike the laevo lattices of other phages with this fold observed so far." @default.
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- W4210536547 date "1933-04-01" @default.
- W4210536547 modified "2023-09-30" @default.
- W4210536547 title "Resolution of racemic trvvtovhane into its optically active constituents" @default.
- W4210536547 doi "https://doi.org/10.1016/s0016-0032(33)90088-5" @default.
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