c Fos (FOS) Rabbit Polyclonal Antibody

Specifications

Product Data
Applications	IP, WB
Recommend Dilution	WB 1:500 - 1:2000
Reactivity	Human
Host	Rabbit
Clonality	Polyclonal
Immunogen	A synthetic peptide of human FOS
Formulation	PBS with 0.05% proclin300,50% glycerol,pH7.3.
Concentration	lot specific
Purification	Affinity purification
Conjugation	Unconjugated
Storage Condition	Store at -20°C as received.
Predicted Protein Size	41 kDa
Gene Name	Fos proto-oncogene, AP-1 transcription factor subunit
Database Link	NP_005243 Entrez Gene 2353 Human UniProt ID P01100
Background	The Fos family of nuclear oncogenes includes c-Fos, FosB, Fos-related antigen 1 (FRA1), and Fos-related antigen 2 (FRA2) (1). While most Fos proteins exist as a single isoform, the FosB protein exists as two isoforms: full-length FosB and a shorter form, FosB2 (Delta FosB), that lacks the carboxy-terminal 101 amino acids (1-3). The expression of Fos proteins is rapidly and transiently induced by a variety of extracellular stimuli including growth factors, cytokines, neurotransmitters, polypeptide hormones, and stress. Fos proteins dimerize with Jun proteins (c-Jun, JunB, and JunD) to form Activator Protein-1 (AP-1), a transcription factor that binds to TRE/AP-1 elements and activates transcription. Fos and Jun proteins contain the leucine-zipper motif that mediates dimerization and an adjacent basic domain that binds to DNA. The various Fos/Jun heterodimers differ in their ability to transactivate AP-1 dependent genes. In addition to increased expression, phosphorylation of Fos proteins by Erk kinases in response to extracellular stimuli may further increase transcriptional activity (4-6). Phosphorylation of c-Fos at Ser32 and Thr232 by Erk5 increases protein stability and nuclear localization (5). Phosphorylation of FRA1 at Ser252 and Ser265 by Erk1/2 increases protein stability and leads to overexpression of FRA1 in cancer cells (6). Following growth factor stimulation, expression of FosB and c-Fos in quiescent fibroblasts is immediate, but very short-lived, with protein levels dissipating after several hours (7). FRA1 and FRA2 expression persists longer and appreciable levels can be detected in asynchronously growing cells (8). Deregulated expression of c-Fos, FosB, or FRA2 can result in neoplastic cellular transformation; however, Delta FosB lacks the ability to transform cells (2,3).
Synonyms	AP-1; C-FOS; p55
Reference Data
Protein Families	Druggable Genome, Transcription Factors
Protein Pathways	B cell receptor signaling pathway, Colorectal cancer, MAPK signaling pathway, Pathways in cancer, T cell receptor signaling pathway, Toll-like receptor signaling pathway

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