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Rap1a immunity proteins The structures of the immunity proteins, Rap1a, responsible for the inhibition and neutralization of Ssp1 endopeptidase, revealed two distinct folds. The structure of the Ssp1-Rap1a complex revealed a tightly bound heteromeric assembly with two effector molecules flanking a Rap1a dimer. The Rap1a subunit displays a compact globular structure constructed from five alpha-helices that assemble to form the highly stable symmetric dimer.
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