The region featured in this family is found towards the C-terminus of poly(A)-binding proteins (PABPs). These are eukaryotic proteins that, through their binding of the 3' poly(A) tail on mRNA, have very important roles in the pathways of gene expression. They seem to provide a scaffold on which other proteins can bind and mediate processes such as export, translation and turnover of the transcripts. Moreover, they may act as antagonists to the binding of factors that allow mRNA degradation, regulating mRNA longevity. PABPs are also involved in nuclear transport. PABPs interact with poly(A) tails via RNA-recognition motifs (pfam00076). Note that the PABP C-terminal region is also found in members of the hyperplastic discs protein (HYD) family of ubiquitin ligases that contain HECT domains - these are also included in this family. Length = 72
>gnl|CDD|197769 smart00517, PolyA, C-terminal domain of Poly(A)-binding protein
These eukaryotic proteins recognize the poly-A of mRNA and consists of four tandem RNA recognition domains at the N-terminus (rrm: pfam00076) followed by a PABP-specific domain (pfam00658) at the C-terminus. The protein is involved in the transport of mRNA's from the nucleus to the cytoplasm. There are four paralogs in Homo sapiens which are expressed in testis (GP:11610605_PABP3 ), platelets (SP:Q13310_PABP4 ), broadly expressed (SP:P11940_PABP1) and of unknown tissue range (SP:Q15097_PABP2). Length = 562
There are four paralogs in Homo sapiens which are expressed in testis, platelets, broadly expressed, or of unknown tissue range.
>PF00658 PABP: Poly-adenylate binding protein, unique domain; InterPro: IPR002004 The polyadenylate-binding protein (PABP) has a conserved C-terminal domain (PABC), which is also found in the hyperplastic discs protein (HYD) family of ubiquitin ligases that contain HECT domains (IPR000569 from INTERPRO) []
PABP recognises the 3' mRNA poly(A) tail and plays an essential role in eukaryotic translation initiation and mRNA stabilisation/degradation. PABC domains of PABP are peptide-binding domains that mediate PABP homo-oligomerisation and protein-protein interactions. In mammals, the PABC domain of PABP functions to recruit several different translation factors to the mRNA poly(A) tail [].; GO: 0003723 RNA binding; PDB: 3KUR_E 1JH4_A 2RQH_B 3KUI_A 3KUS_A 3KUJ_A 3KTR_A 2X04_A 3PTH_A 1JGN_A ....