Polyadenylate-binding protein 1 - P11940 (PABP1_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P11940: 28
Binds the poly(A) tail of mRNA, including that of its own transcript. May be involved in cytoplasmic regulatory processes of mRNA metabolism such as pre-mRNA splicing. Its function in translational initiation regulation can either be enhanced by PAIP1 or repressed by PAIP2. Can probably bind to cytoplasmic RNA sequences other than poly(A) in vivo. Involved in translationally coupled mRNA turnover. Implicated with other RNA-binding proteins in the cytoplasmic deadenylation/translational and decay interplay of the FOS mRNA mediated by the major coding-region determinant of instability (mCRD) domain. Involved in regulation of nonsense-mediated decay (NMD) of mRNAs containing premature stop codons; for the recognition of premature termination codons (PTC) and initiation of NMD a competitive interaction between UPF1 and PABPC1 with the ribosome-bound release factors is proposed. By binding to long poly(A) tails, may protect them from uridylation by ZCCHC6/ZCCHC11 and hence contribute to mRNA stability (PubMed:25480299). Positively regulates the replication of dengue virus (DENV) (PubMed:26735137). UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
May interact with SETX (PubMed:21700224). May form homodimers. Component of a multisubunit autoregulatory ribonucleoprotein complex (ARC), at least composed of IGF2BP1, PABPC1 and CSDE1 (PubMed:16356927). Directly interacts with IGF2BP1. Part of a complex associated with the FOS mCRD domain and consisting of HNRPD, SYNCRIP, PAIP1 and CSDE1/UNR (PubMed:11051545). Interacts with the PABPC1-interacting motif-1 (PAM1) and -2 (PAM2) of PAIP1 and PAIP2 (PubMed:9548260, PubMed:11172725, PubMed:11438674, PubMed:11997512, PubMed:11287632, PubMed:20096703). Interacts with PAIP1 with a 1:1 stoichiometry and with PAIP2 with a 1:2 stoichiometry. The interaction with CSDE1 is direct and RNA-independent. Found in a mRNP complex with YBX2 (By similarity). Interacts with TENT2/GLD2 (By similarity). Identified in the spliceosome C complex (PubMed:11991638). Identified in a mRNP complex, at least composed of DHX9, DDX3X, ELAVL1, HNRNPU, IGF2BP1, ILF3, PABPC1, PCBP2, PTBP2, STAU1, STAU2, SYNCRIP and YBX1. Identified in a IGF2BP1-dependent mRNP granule complex containing untranslated mRNAs. Interacts with NFX1 (PubMed:17267499). Interacts with PIWIL1 (By similarity). Interacts with AGO1, AGO2, GSPT1 and GSPT2 (PubMed:17932509, PubMed:18447585, Ref.51). Interacts with human cytomegalovirus/HHV-5 protein UL69 (PubMed:20133758). Interacts with LARP4B (Ref.53). Interacts (via the second and third RRM domains and the C-terminus) with PAIP2B (via central acidic portion and C-terminus) (PubMed:16804161, PubMed:11287632). Interacts with LARP1 (PubMed:20430826, PubMed:24532714, PubMed:25940091). Interacts with RYDEN (PubMed:26735137). Found in a complex with RYDEN and LARP1 (PubMed:26735137). Interacts with LARP4 (PubMed:21098120). Interacts with ZFC3H1 in a RNase-sensitive manner (PubMed:27871484). Interacts with TRIM71 (via NHL repeats) in an RNA-dependent manner (PubMed:23125361). Interacts with TENT5C; the interaction has no effect on TENT5C poly(A) polymerase function (PubMed:28931820). UniProt
The RNA-binding domains RRM2 and RRM3 and the C-terminus (last 138 amino acids) regions interact with the PABPC1-interacting motif-1 (PAM1) and -2 (PAM2) of PAIP2, respectively. UniProt
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