Heat shock protein beta-11 (HSPB11) (HSPB11)

Heat shock protein 16.2 (HSP16.2), widely recognized in human nomenclature as heat shock protein beta-11 (HSPB11), is a small heat shock protein (sHSP) that serves dual roles as a molecular chaperone and a component of the intraflagellar transport (IFT) machinery. In its chaperone capacity, it functions as an ATP-independent 'holdase' that sequesters misfolded proteins to prevent their aggregation during cellular stress. It also exerts significant anti-apoptotic effects by stabilizing mitochondrial membranes and inhibiting mitochondrial fission through the modulation of DLP1 phosphorylation. Clinically, HSP16.2 is a notable biomarker and potential therapeutic target in oncology; its elevated expression is strongly correlated with increased malignancy, poor response to radiochemotherapy, and survival in brain, esophageal, and hepatocellular cancers. In neurodegenerative research, it is investigated for its ability to mitigate proteotoxicity by interacting with amyloid-beta and alpha-synuclein aggregates. Additionally, HSP16.2 is a well-established biomarker for longevity and individual stress resistance in model organisms like C. elegans, where its induction levels early in life predict future lifespan.

Other names

Heat shock protein 16.2HSP16.2Intraflagellar transport protein 25 homologIFT25C1orf41PP25Small heat shock protein 16.2

Acts as an ATP-independent molecular chaperone (holdase) that prevents the irreversible aggregation of misfolded proteins and stabilizes mitochondrial membranes to inhibit apoptosis. It also functions as a component of the intraflagellar transport (IFT) complex B, facilitating ciliary transport and Hedgehog (Shh) signaling pathway modulation.