TRIM32
Function
E3 ubiquitin ligase that plays a role in various biological processes including neural stem cell differentiation, innate immunity, inflammatory resonse and autophagy (PubMed:19349376, PubMed:31123703). Plays a role in virus-triggered induction of IFN-beta and TNF-alpha by mediating the ubiquitination of STING1. Mechanistically, targets STING1 for 'Lys-63'-linked ubiquitination which promotes the interaction of STING1 with TBK1 (PubMed:22745133). Regulates bacterial clearance and promotes autophagy in Mycobacterium tuberculosis-infected macrophages (PubMed:37543647). Negatively regulates TLR3/4-mediated innate immune and inflammatory response by triggering the autophagic degradation of TICAM1 in an E3 activity-independent manner (PubMed:28898289). Plays an essential role in oxidative stress induced cell death by inducing loss of transmembrane potential and enhancing mitochondrial reactive oxygen species (ROS) production during oxidative stress conditions (PubMed:32918979). Ubiquitinates XIAP and targets it for proteasomal degradation (PubMed:21628460). Ubiquitinates DTNBP1 (dysbindin) and promotes its degradation (PubMed:19349376). May ubiquitinate BBS2 (PubMed:22500027). Ubiquitinates PIAS4/PIASY and promotes its degradation in keratinocytes treated with UVB and TNF-alpha (By similarity). Also acts as a regulator of autophagy by mediating formation of unanchored 'Lys-63'-linked polyubiquitin chains that activate ULK1: interaction with AMBRA1 is required for ULK1 activation (PubMed:31123703). Positively regulates dendritic branching by promoting ubiquitination and subsequent degradation of the epigenetic factor CDYL (PubMed:34888944). Under metabolic stress and phosphorylation by CHK2, mediates 'Lys-63'-linked ubiquitination of ATG7 at 'Lys-45' to initiate autophagy (PubMed:37943659).
(Microbial infection) May play a significant role in mediating the biological activity of the HIV-1 Tat protein in vivo (PubMed:7778269). Binds specifically to the activation domain of HIV-1 Tat and can also interact with the HIV-2 and EIAV Tat proteins in vivo (PubMed:7778269).
Involvement in disease
Muscular dystrophy, limb-girdle, autosomal recessive 8
LGMDR8
An autosomal recessive degenerative myopathy characterized by pelvic girdle, shoulder girdle and quadriceps muscle weakness. Clinical phenotype and severity are highly variable. Disease progression is slow and most patients remain ambulatory into the sixth decade of life.
None
The disease is caused by variants affecting the gene represented in this entry.
Bardet-Biedl syndrome 11
BBS11
A syndrome characterized by usually severe pigmentary retinopathy, early-onset obesity, polydactyly, hypogenitalism, renal malformation and intellectual disability. Secondary features include diabetes mellitus, hypertension and congenital heart disease. Bardet-Biedl syndrome inheritance is autosomal recessive, but three mutated alleles (two at one locus, and a third at a second locus) may be required for clinical manifestation of some forms of the disease.
None
The disease is caused by variants affecting the gene represented in this entry. It has been suggested that TRIM32 might be the E3 ubiquitin ligase for BBS2, a component of the BBSome complex involved in ciliogenesis, that is ubiquitinated and degraded by the proteasome (PubMed:22500027).
Pathway
Protein modification; protein ubiquitination.
Post-translational modifications
Ubiquitinated.
Phosphorylation at Ser-55 by CHEK2 under oxidative stress, activates the E3 ligase activity and promotes ATG7 ubiquitination leading to positive regulation of the autophagosme assembly.
Sequence Similarities
Belongs to the TRIM/RBCC family.
Tissue Specificity
Spleen, thymus, prostate, testis, ovary, intestine, colon and skeletal muscle.
Cellular localization
- Cytoplasm
- Mitochondrion
- Endoplasmic reticulum
- Localized in cytoplasmic bodies, often located around the nucleus.
Alternative names
HT2A, TRIM32, E3 ubiquitin-protein ligase TRIM32, 72 kDa Tat-interacting protein, RING-type E3 ubiquitin transferase TRIM32, Tripartite motif-containing protein 32, Zinc finger protein HT2A