The protein encoded by this gene associates with basic transcription factor 3 (BTF3) to form the nascent polypeptide-associated complex (NAC). NAC binds to nascent proteins as they emerge from the ribosome, blocking interaction with the signal recognition particle (SRP) and preventing mistranslocation to the endoplasmic reticulum. However, nascent proteins with an exposed signal peptide will not be bound by the encoded protein, enabling them to bind the SRP and enter the secretory pathway. This protein has been determined to be an IgE autoantigen in atopic dermatitis patients. Several transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Oct 2011]
Function:
Prevents inappropriate targeting of non-secretory polypeptides to the endoplasmic reticulum (ER). Binds to nascent polypeptide chains as they emerge from the ribosome and blocks their interaction with the signal recognition particle (SRP), which normally targets nascent secretory peptides to the ER. Also reduces the inherent affinity of ribosomes for protein translocation sites in the ER membrane (M sites). May act as a specific coactivator for JUN, binding to DNA and stabilizing the interaction of JUN homodimers with target gene promoters.
Subcellular Location:
Cytoplasm. Nucleus. Predominantly cytoplasmic. Also found in nucleus.
Tissue Specificity:
Ubiquitously expressed.
Post-translational modifications:
Phosphorylation of Ser-43 by ILK during cell adhesion may promote nuclear localization. Phosphorylation of Thr-159 by GSK3B may promote proteasome mediated degradation (By similarity). Phosphorylated upon DNA damage, probably by ATM or ATR.
Similarity:
Belongs to the NASLCalpha family.
Contains 1 NASLCA/B (NASLCalpha/beta) domain.
Contains 1 UBA domain.
SWISS:
Q13765
Gene ID:
4666
Database links:
Entrez Gene: 4666 Human
Omim: 601234 Human
SwissProt: Q13765 Human
Unigene: 505735 Human
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