Heat shock protein family A member 9 nucleotide-binding domain (HSPA9 NBD)

The **nucleotide-binding domain (NBD) of heat shock protein family A member 9 (HSPA9)**, commonly known as Mortalin or mitochondrial Hsp70, is a crucial molecular chaperone primarily localized in the mitochondrial matrix. The Mortalin NBD binds and hydrolyzes ATP, driving the conformational changes necessary for the import, folding, and quality control of mitochondria-targeted proteins. Mortalin regulates diverse cellular processes including mitochondrial function, iron-sulfur (Fe-S) cluster biogenesis, p53 localization and activity, apoptosis, and cellular stress response. Genetic mutations within this domain are linked to diseases such as EVEN-PLUS syndrome and have implications in cancer and neurodegeneration. Mortalin’s interaction with tumor suppressor protein p53 is a therapeutic target, exemplified by the investigational compound MKT-077, which disrupts this interaction and sensitizes cancer cells to apoptosis[1][2][3][4][6][7]. The Mortalin NBD is essential for mitochondrial protein homeostasis, and its dysfunction or targeted inhibition can have pleiotropic cellular effects.

Other names

MortalinHSPA9GRP75mtHsp70mitochondrial Hsp70

Inhibition of ATPase activity of Mortalin NBD; Disruption of Mortalin–p53 interaction; Modulation of mitochondrial stress and apoptosis pathways