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Heat shock protein 65 (HSP65)
- Target
- HSP65
- Molecular classification
- Molecular chaperone, Chaperonin, Heat shock protein (HSP60 family)
01
Overview
Heat shock protein 65 (HSP65) is a highly conserved molecular chaperone predominantly found in prokaryotes, where it supports ATP-dependent folding and assembly of newly synthesized polypeptides and plays an essential role in maintaining cellular protein homeostasis under stress. In mycobacteria (Mycobacterium tuberculosis, Mycobacterium bovis BCG), HSP65 is an immunodominant antigen and serves as the main antigen in immune response to infection. Due to sequence homology with eukaryotic HSP60 proteins, HSP65 is also implicated in molecular mimicry and autoimmune diseases. It's commonly exploited in diagnostic assays, vaccine research, and as a biomarker for infection and autoimmunity[3][4][1].\n\nThis entry is specific for the bacterial heat shock protein HSP65, as commonly referenced in immunology, infection, and autoimmune disease research.
- Other names
- 60 kDa chaperonin 2 proteingroEL proteinGroEL2 proteinAntigen A proteincell wall protein AM. tuberculosis cell wall protein AProtein Cpn60 2 protein
02
Mechanism of action
Null (no approved drugs; mechanism in vaccine and experimental settings is immune activation via antigenicity of HSP65)
03
Biological functions
Protein foldingPrevention of protein aggregationProtein degradationAntigenicity in infection and autoimmunityATP-dependent polypeptide assembly
04
Disease associations
Infection (tuberculosis, leprosy)Autoimmunity (adjuvant arthritis, molecular mimicry)Cancer (researched as a biomarker and vaccine target)
05
Safety considerations
Autoimmune activation due to molecular mimicry between microbial HSP65 and host HSP60 proteinsPotential induction of arthritis and other autoimmune conditions in animal models following immunization with HSP65
06
Biomarkers
Presence of anti-HSP65 antibodies (in TB diagnosis and autoimmunity studies)HSP65 protein levels in tissues (research biomarker for mycobacterial infection)
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