ADAMs (short for a disintegrin and metalloproteinase) are a family of single-pass transmembrane and secreted metalloendopeptidases.[1][2] All ADAMs are characterized by a particular domain organization featuring a pro-domain, a metalloprotease, a disintegrin, a cysteine-rich, an epidermal-growth factor like and a transmembrane domain, as well as a C-terminal cytoplasmic tail.[3] Nonetheless, not all human ADAMs have a functional protease domain, which indicates that their biological function mainly depends on protein–protein interactions.[4] Those ADAMs which are active proteases are classified as sheddases because they cut off or shed extracellular portions of transmembrane proteins.[4] For example, ADAM10 can cut off part of the HER2 receptor, thereby activating it.[5] ADAM genes are found in animals, choanoflagellates, fungi and some groups of green algae. Most green algae and all land plants likely lost ADAM proteins.[6]
ADAMs are categorized under the EC3.4.24.46 enzyme group, and in the MEROPS peptidase family M12B.[3] The terms adamalysin and MDC family (metalloproteinase-like, disintegrin-like, cysteine rich) have been used to refer to this family historically.[7]