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A recent perspective [Erickson, H. (2012). Bacterial actin homolog ParM: arguments for an apolar, antiparallel double helix. J. Mol. Biol., 422, 461–463] by Harold Erickson has suggested that published reconstructions of bacterial ParM filaments from three different laboratories may have artifactually imposed polarity upon a filament that is really bipolar, with the two strands running in opposite...
A stepwise addition protocol was developed to display cargo using bacteriophage P22 capsids and the phage decoration (Dec) protein. Three-dimensional image reconstructions of frozen-hydrated samples of P22 particles with nanogold-labeled Dec bound to them revealed the locations of the N- and C-termini of Dec. Each terminus is readily accessible for molecular display through affinity tags such as nickel-nitrilotriacetic...
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