Metallothionein

UniProtKB accession:  J2EKT7

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UniProtKB description:  Metallothioneins are small proteins that have a high content of cysteine residues which allow them to bind heavy metal ions through clusters of thiolate bonds (PubMed:30191219). Preferentially, binds four Cd(2+) ions (PubMed:30191219). Also binds three Zn(2+) ions but with less affinity (PubMed:30191219). Required for long-term viability (PubMed:32793167). May play a role in the storage or sequestration of metals when present in excess (PubMed:32793167).