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The three-dimensional crystal structure of the bacteriophage φ29 connector has been solved and refined to 2.1 Å resolution. This 422 kDa oligomeric protein connects the head of the phage to its tail and translocates the DNA into the prohead during packaging. Each monomer has an elongated shape and is composed of a central, mainly α-helical domain that includes a three-helix bundle, a distal α/β domain...
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