Background: Vaccinia viral protein A27 associates with viral membrane protein A17 for anchoring to the viral membrane. Results: A27 specifically interacts with two binding regions within the N-terminal domain of A17. Conclusion: The A27-A17 interaction is mediated through a specific and cooperative binding mechanism. Significance: As demonstrated, the F1 and F2 bindings are critical for A27 anchoring to the viral membrane and virion assembly.
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