Polyadenylate-Binding Protein 4 (PABPC4) ELISA Kit for Human

Poly(A)-binding proteins (PABPs) bind to the poly(A) tail present at the 3-prime ends of most eukaryotic mRNAs. PABPC4 or IPABP (inducible PABP) was isolated as an activation-induced T-cell mRNA encoding a protein. Activation of T cells increased PABPC4 mRNA levels in T cells approximately 5-fold. PABPC4 contains 4 RNA-binding domains and proline-rich C terminus. PABPC4 is localized primarily to the cytoplasm. It is suggested that PABPC4 might be necessary for regulation of stability of labile mRNA species in activated T cells. PABPC4 was also identified as an antigen, APP1 (activated-platelet protein-1), expressed on thrombin-activated rabbit platelets. PABPC4 may also be involved in the regulation of protein translation in platelets and megakaryocytes or may participate in the binding or stabilization of polyadenylates in platelet dense granules. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2008]

PABP 4: poly(A) binding protein 4 may be involved in cytoplasmic regulatory processes of mRNA metabolism. Can probably bind to cytoplasmic RNA sequences other than poly(A) in vivo. Expressed at low levels in resting normal T cells; following T-cell activation, however, mRNA levels are rapidly up-regulated. Localized primarily to the cytoplasm. It is suggested that PABPC4 might be necessary for regulation of stability of labile mRNA species in activated T cells.

Protein type: RNA-binding; Translation

Chromosomal Location of Human Ortholog: 1p34.3

Cellular Component: cytoplasm; cytosol; intracellular ribonucleoprotein complex; nucleus; stress granule

Molecular Function: mRNA binding; poly(A) binding; poly(C) RNA binding; poly(U) binding; protein binding; RNA binding

Biological Process: blood coagulation; regulation of mRNA stability; RNA catabolic process; RNA processing; translation