Metalloproteins represent ~30% of the PDB archive. Ensuring FAIR data practices for metalloproteins is highly impactful. wwPDB will update existing polyatomic metal containing PDB entries and CCDs to make metalloprotein structures findable and reusable with more complete chemical description and metal coordination annotation. About ~900 metal-containing polyatomic CCDs and ~13000 affected PDB entries will be updated and publicly available in Q3 2026. The updates include standardization of calculated charge, improved ideal coordinate calculation, metal coordination and pi bond annotation, and coordination geometry annotation in the CCDs and impacted PDB entries. This remediation effort includes adoption of metalloprotein community software (FindGeo from MetalPDB and MetalCoord from CCP4). Details are available at wwPDB.org. <https://www.wwpdb.org/documentation/metalloprotein-remediation> The PDBx/mmCIF dictionary extensions, examples of PDBx/mmCIF files of remediated data representing various cases, and the corresponding proposed Chemical Component Dictionary definitions are provided at GitHub <https://github.com/wwPDB/metallo-extension> for testing and adoption by key stakeholders during the development stage, including the metalloprotein community, refinement software developers, cheminformaticians, and 3D visualization software. For any further information please contact us at info@wwpdb.org. Full news: https://www.wwpdb.org/news/news?year=2025#68fbbb6b829c3fea8eaf395b On behalf of the wwPDB -- IRINA PERSIKOVA, Ph.D. Deputy Biocuration Lead, RCSB Protein Data Bank Research Associate, Institute for Quantitative Biomedicine Rutgers, The State University of New Jersey 174 Frelinghuysen Road, Piscataway NJ 08854 P: 848.445.4938 | E: irina.persikova@rcsb.org <mailto:irina.persikova@rcsb.org> rcsb.org <www.rcsb.org> | iqb.rutgers.edu <http://iqb.rutgers.edu> | facebook <https://www.facebook.com/RCSBPDB> | twitter <https://twitter.com/buildmodels>