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Interferon regulatory factors (IRF) are proteins which regulate transcription of interferons (see regulation of gene expression). [1] Interferon regulatory factors contain a conserved N-terminal region of about 120 amino acids, which folds into a structure that binds specifically to the IRF-element (IRF-E) motifs, which is located upstream of the interferon genes. [2]
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IRF3 is a member of the interferon regulatory transcription factor (IRF) family. [5] IRF3 was originally discovered as a homolog of IRF1 and IRF2.IRF3 has been further characterized and shown to contain several functional domains including a nuclear export signal, a DNA-binding domain, a C-terminal IRF association domain and several regulatory phosphorylation sites. [6]
IRF5 is a direct transducer to interferon signaling and is activated via phosphorylation. [11] The IRF family can also initiate the JAK/STAT signaling pathway by binding to transmembrane receptors that activate JAK. [12] IRFs, IFNs, and the JAK/STAT signaling pathway work together to fight viral infections in mammals through specific signals. [13]
[27] [28] Reducing IFN-α activity may prevent signaling via STAT1, STAT2, or IRF9 (as with JEV infection) or through the JAK-STAT pathway (as with DEN-2 infection). [26] Several poxviruses encode soluble IFN receptor homologs—like the B18R protein of the vaccinia virus—that bind to and prevent IFN interacting with its cellular receptor ...
After recognizing viral DNA, DNA sensors initiate the downstream signaling pathways by activating STING-mediated interferon response. [15] Adenovirus, herpes simplex virus, HSV-1 and HSV-2, as well as the negative-stranded RNA virus, vesicular stomatitis virus (VSV), have been shown to be able to activate a STING-dependent innate immune ...
Interferon regulatory factor 1 was the first member of the interferon regulatory transcription factor (IRF) family identified. Initially described as a transcription factor able to activate expression of the cytokine Interferon beta, [6] IRF-1 was subsequently shown to function as a transcriptional activator or repressor of a variety of target genes.
Akt/PKB signalling pathway; AMPK signalling pathway; cAMP-dependent pathway; Eph/ephrin signalling pathway; Hedgehog signalling pathway; Hippo signalling pathway; Insulin signal transduction pathway; JAK-STAT signalling pathway; MAPK/ERK signalling pathway; mTOR signalling pathway; Nodal signalling pathway; Notch signalling pathway; PI3K/AKT ...