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Defensins are key players of the innate immune system known to act against bacteria, fungi and viruses. Here we report the 0.98-Å crystal structure of SPE10, a dimeric plant defensin. SPE10 associates as a dimer through a unique amino acid triplet involving residues R36–W42–R40. The helix from one subunit interacts with arginines R36 and R40 from the other subunit, forming a sheet-like dimer with...
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