Calcium-dependent acyltransferase that catalyzes the formation of covalent bonds between peptide-bound glutamine and various primary amines, such as gamma-amino group of peptide-bound lysine, or mono- and polyamines, thereby producing cross-linked or aminated proteins, respectively (PubMed:9252372, PubMed:23941696, PubMed:31991788). Involved in many biological processes, such as bone development, angiogenesis, wound healing, cellular differentiation, chromatin modification and apoptosis (PubMed:1683874, PubMed:7935379, PubMed:9252372, PubMed:27270573). Acts as a protein-glutamine gamma- glutamyltransferase by mediating the cross-linking of proteins, such as ACO2, HSPB6, FN1, HMGB1, RAP1GDS1, SLC25A4/ANT1, SPP1 and WDR54 (PubMed:23941696, PubMed:24349085, PubMed:29618516, PubMed:30458214). Under physiological conditions, the protein cross-linking activity is inhibited by GTP; inhibition is relieved by Ca(2+) in response to various stresses (PubMed:7649299, PubMed:7592956, PubMed:18092889). When secreted, catalyzes cross-linking of proteins of the extracellular matrix, such as FN1 and SPP1 resulting in the formation of scaffolds (PubMed:12506096). Plays a key role during apoptosis, both by (1) promoting the cross-linking of cytoskeletal proteins resulting in condensation of the cytoplasm, and by (2) mediating cross-linking proteins of the extracellular matrix, resulting in the irreversible formation of scaffolds that stabilize the integrity of the dying cells before their clearance by phagocytosis, thereby preventing the leakage of harmful intracellular components (PubMed:7935379, PubMed:9252372). In addition to protein cross-linking, can use different monoamine substrates to catalyze a vast array of protein post-translational modifications: mediates aminylation of serotonin, dopamine, noradrenaline or histamine into glutamine residues of target proteins to generate protein serotonylation, dopaminylation, noradrenalinylation or histaminylation, respectively (PubMed:23797785, PubMed:30867594). Mediates protein serotonylation of small GTPases during activation and aggregation of platelets, leading to constitutive activation of these GTPases (By similarity). Plays a key role in chromatin organization by mediating serotonylation and dopaminylation of histone H3 (PubMed:30867594, PubMed:32273471). Catalyzes serotonylation of 'Gln-5' of histone H3 (H3Q5ser) during serotonergic neuron differentiation, thereby facilitating transcription (PubMed:30867594). Acts as a mediator of neurotransmission-independent role of nuclear dopamine in ventral tegmental area (VTA) neurons: catalyzes dopaminylation of 'Gln- 5' of histone H3 (H3Q5dop), thereby regulating relapse-related transcriptional plasticity in the reward system (PubMed:32273471). Regulates vein remodeling by mediating serotonylation and subsequent inactivation of ATP2A2/SERCA2 (By similarity). Also acts as a protein deamidase by mediating the side chain deamidation of specific glutamine residues of proteins to glutamate (PubMed:9623982, PubMed:20547769). Catalyzes specific deamidation of protein gliadin, a component of wheat gluten in the diet (PubMed:9623982). May also act as an isopeptidase cleaving the previously formed cross-links (PubMed:26250429, PubMed:27131890). Also able to participate in signaling pathways independently of its acyltransferase activity: acts as a signal transducer in alpha-1 adrenergic receptor-mediated stimulation of phospholipase C-delta (PLCD) activity and is required for coupling alpha-1 adrenergic agonists to the stimulation of phosphoinositide lipid metabolism (PubMed:8943303). {By
SimilarityUniProtKB:P08587, By
SimilarityUniProtKB:P21981, Experimental EvidencePubMed:12506096, Experimental EvidencePubMed:1683874, Experimental EvidencePubMed:18092889, Experimental EvidencePubMed:20547769, Experimental EvidencePubMed:23797785, Experimental EvidencePubMed:23941696, Experimental EvidencePubMed:24349085, Experimental EvidencePubMed:26250429, Experimental EvidencePubMed:27131890, Experimental EvidencePubMed:29618516, Experimental EvidencePubMed:30458214, Experimental EvidencePubMed:30867594, Experimental EvidencePubMed:31991788, Experimental EvidencePubMed:32273471, Experimental EvidencePubMed:7592956, Experimental EvidencePubMed:7649299, Experimental EvidencePubMed:7935379, Experimental EvidencePubMed:8943303, Experimental EvidencePubMed:9252372, Experimental EvidencePubMed:9623982, Curator InferencePubMed:27270573}. [Isoform 2]: Has cytotoxic activity: is able to induce apoptosis independently of its acyltransferase activity. {Experimental EvidencePubMed:17116873}.
Note=TGM2 constitutes the major autoantigen in celiac disease, a multifactorial chronic disorder of the small intestine caused by intolerance to gluten (PubMed:9212111, PubMed:9623982). Celiac disease is characterized by immune-mediated enteropathy associated with failed intestinal absorption and malnutrition: intestinal inflammation is precipitated by ingestion of the protein gliadin, a component of wheat gluten in the diet (PubMed:9212111, PubMed:9623982). TGM2 is the main target for celiac disease-associated anti-endomysium autoantibodies (PubMed:9212111). It mediates its effect by catalyzing specific deamidation of gliadin; this deamidation creates an epitope that binds efficiently to HLA-DQ2 and is recognized by gut-derived T-cells (PubMed:9623982). {Experimental EvidencePubMed:9212111, Experimental EvidencePubMed:9623982}.
TGF-beta-activated kinase 1 and MAP3K7-binding protein 2 (Mitogen-activated protein kinase kinase kinase 7-interacting protein 2) (TAK1-binding protein 2) (TAB-2) (TGF-beta-activated kinase 1-binding protein 2)
Epididymis secretory protein Li 103 (Epididymis secretory sperm binding protein) (HSPA1A) (HSPA1B) (Heat shock 70kDa protein 1A) (Heat shock 70kDa protein 1B) (cDNA FLJ75127, highly similar to Homo sapiens heat shock 70kDa protein 1A, mRNA)
Ceramide transfer protein (hCERT) (Collagen type IV alpha-3-binding protein) (Goodpasture antigen-binding protein) (GPBP) (START domain-containing protein 11) (StARD11) (StAR-related lipid transfer protein 11)
SERTA domain-containing protein 1 (CDK4-binding protein p34SEI1) (SEI-1) (p34(SEI-1)) (Transcriptional regulator interacting with the PHD-bromodomain 1) (TRIP-Br1)
RNA-binding protein 25 (Arg/Glu/Asp-rich protein of 120 kDa) (RED120) (Protein S164) (RNA-binding motif protein 25) (RNA-binding region-containing protein 7)
RING1 and YY1-binding protein (Apoptin-associating protein 1) (APAP-1) (Death effector domain-associated factor) (DED-associated factor) (YY1 and E4TF1-associated factor 1)
Dynamin-1-like protein (EC 3.6.5.5) (Dnm1p/Vps1p-like protein) (DVLP) (Dynamin family member proline-rich carboxyl-terminal domain less) (Dymple) (Dynamin-like protein) (Dynamin-like protein 4) (Dynamin-like protein IV) (HdynIV) (Dynamin-related protein 1)
National and Kapodistrian University of Athens
Department of Biology
Biophysics & Bioinformatics Laboratory