Full-length sdeC genes were amplified by PCR and cloned into the bacterial expression vector pQE-80L (Qiagen) with BamHI and SacI restriction sites to generate a 6xHis-SdeC-StrepII fusion construct (Supplemental Table S1). Purification was as previously described22 (link). Purified aliquots were stored at −80°C in 10% glycerol to minimize or eliminate freeze thaw cycle degradation.