1,10-Phenanthroline (18851-33-7) is a high affinity chelator of divalent metal ions and may be used to inhibit zinc metalloenzymes. It is a potent inhibitor of JAMM-type isopeptidases (DUBs) acting via chelation of an active site Zn. It may be used when preparing cell lysates for enrichment of ubiquitinated proteins which are especially sensitive to DUBs in the JAMM family.