Annexin A2 also known as annexin II is a protein that in humans is encoded by the ANXA2 gene. [5]
Annexin 2 is involved in diverse cellular processes such as cell motility (especially that of the epithelial cells), linkage of membrane-associated protein complexes to the actin cytoskeleton, endocytosis, fibrinolysis, ion channel formation, and cell matrix interactions. It is a calcium-dependent phospholipid-binding protein whose function is to help organize exocytosis of intracellular proteins to the extracellular domain. Annexin II is a pleiotropic protein meaning that its function is dependent on place and time in the body.
The ANXA2 gene, located at 15q22.2, has three pseudogenes located on chromosomes 4, 9 and 10, respectively. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [6]
This protein is a member of the annexin family. Members of this calcium-dependent phospholipid-binding protein family play a role in the regulation of cellular growth and in signal transduction pathways. This protein functions as an autocrine factor which heightens osteoclast formation and bone resorption. [6] Epigenetic regulation of Annexin A2 has been identified as a key determinant of mesenchymal transformation in brain tumors. [7] Maternal deficiency of the ANXA2 gene contributes to shallow decidual invasion by placental cytotrophoblast cells. These findings highlight the maternal contribution to the pathogenesis of severe preeclampsia. [8]
Annexin A2 has been proposed to function inside the cell in sorting of endosomes and outside the cell in anticoagulant reactions.
Annexin A2 has been shown to interact with Prohibitin, [9] CEACAM1, [10] S100A10, [11] [12] PCNA, [13] complement Factor H, [14] and a number of viral factors including the HPV16 minor capsid protein L2. [15] [16]
Annexin is a common name for a group of cellular proteins. They are mostly found in eukaryotic organisms.
Proliferating cell nuclear antigen (PCNA) is a DNA clamp that acts as a processivity factor for DNA polymerase δ in eukaryotic cells and is essential for replication. PCNA is a homotrimer and achieves its processivity by encircling the DNA, where it acts as a scaffold to recruit proteins involved in DNA replication, DNA repair, chromatin remodeling and epigenetics.
Growth factor receptor-bound protein 2, also known as Grb2, is an adaptor protein involved in signal transduction/cell communication. In humans, the GRB2 protein is encoded by the GRB2 gene.
Annexin A1, also known as lipocortin I, is a protein that is encoded by the ANXA1 gene in humans.
Annexin A5 is a cellular protein in the annexin group. In flow cytometry, annexin V is commonly used to detect apoptotic cells by its ability to bind to phosphatidylserine, a marker of apoptosis when it is on the outer leaflet of the plasma membrane. The function of the protein is unknown; however, annexin A5 has been proposed to play a role in the inhibition of blood coagulation by competing for phosphatidylserine binding sites with prothrombin and also to inhibit the activity of phospholipase A1. These properties have been found by in vitro experiments.
Non-receptor tyrosine-protein kinase TYK2 is an enzyme that in humans is encoded by the TYK2 gene.
Tyrosine-protein kinase HCK is an enzyme that in humans is encoded by the HCK gene.
Calcium/calmodulin-dependent protein kinase type II subunit alpha (CAMKIIα), a.k.a.Ca2+/calmodulin-dependent protein kinase II alpha, is one subunit of CamKII, a protein kinase (i.e., an enzyme which phosphorylates proteins) that in humans is encoded by the CAMK2A gene.
Receptor tyrosine-protein kinase erbB-4 is an enzyme that in humans is encoded by the ERBB4 gene. Alternatively spliced variants that encode different protein isoforms have been described; however, not all variants have been fully characterized.
MAP kinase-activated protein kinase 2 is an enzyme that in humans is encoded by the MAPKAPK2 gene.
Dual specificity protein phosphatase 1 is an enzyme that in humans is encoded by the DUSP1 gene.
Annexin A6 is a protein that in humans is encoded by the ANXA6 gene.
cAMP-dependent protein kinase type II-alpha regulatory subunit is an enzyme that in humans is encoded by the PRKAR2A gene.
Flap endonuclease 1 is an enzyme that in humans is encoded by the FEN1 gene.
Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) also known as CD66a, is a human glycoprotein, and a member of the carcinoembryonic antigen (CEA) gene family.
Tyrosine-protein phosphatase non-receptor type 12 is an enzyme that in humans is encoded by the PTPN12 gene.
Discoidin domain receptor family, member 1, also known as DDR1 or CD167a, is a human gene.
S100 calcium-binding protein A10 (S100A10), also known as p11, is a protein that is encoded by the S100A10 gene in humans and the S100a10 gene in other species. S100A10 is a member of the S100 family of proteins containing two EF-hand calcium-binding motifs. S100 proteins are localized in the cytoplasm and/or nucleus of a wide range of cells. They regulate a number of cellular processes such as cell cycle progression and differentiation. The S100 protein is implicated in exocytosis and endocytosis by reorganization of F-actin.
Annexin A4 is a protein that in humans is encoded by the ANXA4 gene.
Annexin A3 is a protein that in humans is encoded by the ANXA3 gene.