|, AD10, AD18, CD156c, HsT18717, MADM, RAK, kuz, CDw156, ADAM metallopeptidase domain 10|
|RNA expression pattern|
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|PDB structures||RCSB PDB PDBe PDBsum|
Members of the ADAM family are cell surface proteins with a unique structure possessing both potential adhesion and protease domains. Sheddase, a generic name for the ADAM metallopeptidase, functions primarily to cleave membrane proteins at the cellular surface. Once cleaved, the sheddases release soluble ectodomains with an altered location and function.
Although a single sheddase may “shed” a variety of substances, multiple sheddases can cleave the same substrate resulting in different consequences.This gene encodes an ADAM family member that cleaves many proteins including TNF-alpha and E-cadherin.
ADAM10 cleaves ephrin, within the ephrin/eph complex, formed between two cell surfaces. When ephrin is freed from the opposing cell, the entire ephrin/eph complex is endocytosed. This shedding in trans had not been previously shown, but may well be involved in other shedding events.
Although no crystallographic x-ray diffraction analyses have been published that depict the entire structure of ADAM10, one domain has been studied using this technique. The disintigrin and cysteine-rich domain (shown to the right) plays an essential role in regulation of protease activity in vivo. Recent experimental evidence suggests that this region, which is distinct from the active site, may be responsible for substrate specificity of the enzyme. It is proposed that this domain binds to particular regions of the enzyme’s substrate, allowing peptide bond hydrolysis to occur in well defined locations on certain substrate proteins.
The proposed active site of ADAM10 has been identified by sequence analysis, and is identical to enzymes in the Snake Venom metalloprotein domain family. The consensus sequence for catalytically active ADAM proteins is HEXGHNLGXXHD. Structural analysis of ADAM17, which has the same active site sequence as ADAM10, suggests that the three histidines in this sequence bind a Zn2+ atom, and that the glutamate is the catalytic residue.
Although the exact mechanism of ADAM10 has not been thoroughly investigated, its active site is homologous to those of well studied zinc-proteases such as carboxypeptidase A and thermolysin. Therefore it is proposed that ADAM10 utilizes a similar mechanism as these enzymes. In zinc proteases, the key catalytic elements have been identified as a glutamate residue and a Zn2+ ion coordinated to histidine residues.
The proposed mechanism begins with deprotonation of a water molecule by glutamate. The resultant hydroxide initiates a nucleophillic attack on a carbonyl carbon on the peptide backbone, producing a tetrahedral intermediate. This step is facilitated by electron withdrawal from oxygen by Zn2+ and by zinc’s subsequent stabilization of the negative charge on the oxygen atom in the intermediate state. As electrons move down from the oxygen atom to re-form the double bond, the tetrahedral intermediate collapses to products with protonation of -NH by the glutamate residue.
Interaction with the malaria parasite
A number of different proteins on the surface of Plasmodium falciparum malaria parasites help the invaders bind to red blood cells. But once attached to host blood cells, the parasites need to shed the 'sticky' surface proteins that would otherwise interfere with entrance into the cell. The Sheddase enzyme, specifically called PfSUB2 in this example, is required for the parasites to invade cells; without it, the parasites die. The sheddase is stored in and released from cellular compartments near the tip of the parasite, according to the study. Once on the surface, the enzyme attaches to a motor that shuttles it from front to back, liberating the sticky surface proteins. With these proteins removed, the parasite gains entrance into a red blood cell. The entire invasion lasts about 30 seconds and without this ADAM metallopeptidase, malaria would be ineffective at invading the red blood cells.
In combination with low doses of herceptin, selective ADAM10 inhibitors decrease proliferation in HER2 over-expressing cell lines while inhibitors, that do not inhibit ADAM10, have no impact. These results are consistent with ADAM10 being a major determinant of HER2 shedding, the inhibition of which, may provide a novel therapeutic approach for treating breast cancer and a variety of other cancers with active HER2 signaling.
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- ADAM10 human gene location in the UCSC Genome Browser.
- ADAM10 human gene details in the UCSC Genome Browser.