Recombinant Human Heat shock protein HSP 90-alpha (HSP90AA1), Truncated

Uniprot Id

P07900

Target Species

Human

Target Name

HSP90AA1

Target Full Name

Heat shock protein HSP 90-alpha

Target Function

Molecular chaperone that promotes the maturation, structural maintenance and proper regulation of specific target proteins involved for instance in cell cycle control and signal transduction. Undergoes a functional cycle that is linked to its ATPase activity which is essential for its chaperone activity. This cycle probably induces conformational changes in the client proteins, thereby causing their activation. Interacts dynamically with various co-chaperones that modulate its substrate recognition, ATPase cycle and chaperone function. Engages with a range of client protein classes via its interaction with various co-chaperone proteins or complexes, that act as adapters, simultaneously able to interact with the specific client and the central chaperone itself. Recruitment of ATP and co-chaperone followed by client protein forms a functional chaperone. After the completion of the chaperoning process, properly folded client protein and co-chaperone leave HSP90 in an ADP-bound partially open conformation and finally, ADP is released from HSP90 which acquires an open conformation for the next cycle. Plays a critical role in mitochondrial import, delivers preproteins to the mitochondrial import receptor TOMM70. Apart from its chaperone activity, it also plays a role in the regulation of the transcription machinery. HSP90 and its co-chaperones modulate transcription at least at three different levels. In the first place, they alter the steady-state levels of certain transcription factors in response to various physiological cues(PubMed:25973397). Second, they modulate the activity of certain epigenetic modifiers, such as histone deacetylases or DNA methyl transferases, and thereby respond to the change in the environment. Third, they participate in the eviction of histones from the promoter region of certain genes and thereby turn on gene expression. Binds bacterial lipopolysaccharide (LPS) and mediates LPS-induced inflammatory response, including TNF secretion by monocytes. Antagonizes STUB1-mediated inhibition of TGF-beta signaling via inhibition of STUB1-mediated SMAD3 ubiquitination and degradation. Mediates the association of TOMM70 with IRF3 or TBK1 in mitochodria outer membrane which promotes host antiviral response.

Target Subcellular Location

Nucleus. Cytoplasm. Melanosome. Cell membrane. Mitochondrion. Note=Identified by mass spectrometry in melanosome fractions from stage I to stage IV.

Target Protein Families

Heat shock protein 90 family

Target Research Area

Neuroscience

Target Synonyms

Heat shock 86 kDa; Heat shock protein 90kDa alpha cytosolic class A member 1; Heat shock protein 90kDa alpha cytosolic class B member 1; Heat shock protein HSP 90 alpha ; Heat shock protein HSP 90 beta; Heat shock protein HSP 90-alpha; HS90A_HUMAN; HSP 84; HSP 86; Hsp 90; HSP86; HSP90A; HSP90AA1; HSP90AB1; HSP90B; HSPC1; HSPC2; HSPCAL1 ; HSPCAL4; Renal carcinoma antigen NY-REN-38

Target Background

The protein encoded by this gene is an inducible molecular chaperone that functions as a homodimer. The encoded protein aids in the proper folding of specific target proteins by use of an ATPase activity that is modulated by co-chaperones. Two transcript variants encoding different isoforms have been found for this gene.