Metal ion transporters are specialized proteins that facilitate the movement of metal ions across cell membranes. These transporters are crucial for maintaining cellular metal ion homeostasis, which is essential for various biological processes, including enzyme function and cellular signaling. They help cells absorb necessary metals like iron, copper, and zinc, while also preventing toxic accumulation of excess metals. Different types of metal ion transporters exist, each tailored to specific metals and cellular needs. For example, SLC metal transporters are a family of solute carrier proteins that play a significant role in transporting essential metal ions. Dysfunction in these transporters can lead to various health issues, including Wilson's disease and hemochromatosis.