ID:DDX1_HUMAN DESCRIPTION: RecName: Full=ATP-dependent RNA helicase DDX1; EC=3.6.4.13; AltName: Full=DEAD box protein 1; AltName: Full=DEAD box protein retinoblastoma; Short=DBP-RB; FUNCTION: Acts as an ATP-dependent RNA helicase, able to unwind both RNA-RNA and RNA-DNA duplexes. Possesses 5' single-stranded RNA overhang nuclease activity. Possesses ATPase activity on various RNA, but not DNA polynucleotides. May play a role in RNA clearance at DNA double-strand breaks (DSBs), thereby facilitating the template-guided repair of transcriptionally active regions of the genome. Together with RELA, acts as a coactivator to enhance NF-kappa-B-mediated transcriptional activation. Acts as a positive transcriptional regulator of cyclin CCND2 expression. Binds to the cyclin CCND2 promoter region. Associates with chromatin at the NF- kappa-B promoter region via association with RELA. Binds to poly(A) RNA. May be involved in 3'-end cleavage and polyadenylation of pre-mRNAs. Required for HIV-1 Rev function as well as for HIV-1 replication. Binds to the RRE sequence of HIV-1 mRNAs. CATALYTIC ACTIVITY: ATP + H(2)O = ADP + phosphate. SUBUNIT: Interacts with PHF5A (via C-terminus) (By similarity). Interacts with MBNL1. Interacts with CSTF2. Interacts with HNRNPK. Interacts with ATM. Interacts with RELA (via C-terminus). Interacts (via C-terminus) with the replicase polyprotein 1ab Nsp14 of the avian infectious bronchitis virus (IBV). Interacts with Rev of HIV-1. Interacts with severe acute respiratory syndrome coronavirus (SARS-CoV) (via N-terminus). Component of the tRNA-splicing ligase complex. SUBCELLULAR LOCATION: Nucleus. Cytoplasm. Cytoplasmic granule. Note=Localized with MBNL1, TIAL1 and YBX1 in stress granules upon stress. Localized with CSTF2 in cleavage bodies. Forms large aggregates called DDX1 bodies. Relocalized into multiple foci (IR- induced foci or IRIF) after IR treatment, a process that depends on the presence of chromosomal DNA and/or RNA-DNA duplexes. Relocalized at sites of DNA double-strand breaks (DSBs) in an ATM- dependent manner after IR treatment. Colocalized with RELA in the nucleus upon TNF-alpha induction. Relocalized to the cytoplasm with a perinuclear staining pattern in avian infectious bronchitis virus (IBV)-infected cells. Required for proper localization of HIV-1 Rev. TISSUE SPECIFICITY: Highest levels of transcription in 2 retinoblastoma cell lines and in tissues of neuroectodermal origin including the retina, brain, and spinal cord. DOMAIN: The helicase domain is involved in the stimulation of RELA transcriptional activity. PTM: Phosphorylated. Phosphorylated by ATM kinase; phosphorylation is increased in response to ionizing radiation (IR). SIMILARITY: Belongs to the DEAD box helicase family. DDX1 subfamily. SIMILARITY: Contains 1 B30.2/SPRY domain. SIMILARITY: Contains 1 helicase ATP-binding domain. SIMILARITY: Contains 1 helicase C-terminal domain. CAUTION: According to some authors the unwinding activity is ADP- dependent and not ATP-dependent (PubMed:18710941).
The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.
ModBase Predicted Comparative 3D Structure on Q92499
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Orthologous Genes in Other Species
Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
US Server
Sequence and Links to Tools and Databases 
Common Gene Haplotype Alleles 
