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darobactin maturation radical SAM/SPASM protein DarE The radical SAM/SPASM protein DarE is a maturase for the ribosomally translated, post-translationally modified peptide natural product (RiPP) darobactin, including forms A, B, C, D, and E. The mature form is just seven amino acids long, with two cross-links, a Trp1-Trp3 linkage and a Trp3-Lys5 (or Arg5) linkage.
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