Abstract
The heat shock protein 90 kDa (Hsp90) family of chaperones is highly sought-after for the treatment of cancer and neurodegenerative diseases. Glucose regulated protein 94 (Grp94) is the endoplasmic reticulum localized isoform that is responsible for the maturation of proteins involved in cell adhesion and the immune response, including Toll-like receptors, immunoglobulins, and integrins. Consequently, Grp94 has been implicated in many different diseases including cancer metastasis, glaucoma, and viral infection. 5'-(N-Ethylcarboxamido)adenosine (NECA) was identified from a high-throughput screen as one of the first molecules to exhibit isoform selectivity toward Grp94, with the ethyl group projecting into a unique pocket within the ATP binding site of Grp94. This pocket has since been exploited by several groups to develop Grp94 selective inhibitors. Despite success in the development of other classes of inhibitors, relatively little work has been done to further develop inhibitors with the NECA scaffold. Unfortunately, NECA is also a potent adenosine receptor agonist, which is likely to confound any biological activity. Therefore, structure-activity relationship studies were performed on the NECA scaffold leading to the discovery of several molecules that displayed similar selectivity and affinity as the parent compound.
Published Version
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