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Identification
HMDB Protein ID HMDBP10642
Secondary Accession Numbers
  • 16872
Name Spliceosome RNA helicase DDX39B
Synonyms
  1. 56 kDa U2AF65-associated protein
  2. ATP-dependent RNA helicase p47
  3. DEAD box protein UAP56
  4. HLA-B-associated transcript 1 protein
Gene Name DDX39B
Protein Type Enzyme
Biological Properties
General Function Involved in nucleic acid binding
Specific Function Component of the THO subcomplex of the TREX complex. The TREX complex specifically associates with spliced mRNA and not with unspliced pre-mRNA. It is recruited to spliced mRNAs by a transcription-independent mechanism. Binds to mRNA upstream of the exon-junction complex (EJC) and is recruited in a splicing- and cap-dependent manner to a region near the 5' end of the mRNA where it functions in mRNA export. The recruitment occurs via an interaction between ALYREF/THOC4 and the cap-binding protein NCBP1. DDX39B functions as a bridge between ALYREF/THOC4 and the THO complex. The TREX complex is essential for the export of Kaposi's sarcoma-associated herpesvirus (KSHV) intronless mRNAs and infectious virus production. The recruitment of the TREX complex to the intronless viral mRNA occurs via an interaction between KSHV ORF57 protein and ALYREF/THOC4. Splice factor that is required for the first ATP-dependent step in spliceosome assembly and for the interaction of U2 snRNP with the branchpoint. Has both RNA-stimulated ATP binding/hydrolysis activity and ATP-dependent RNA unwinding activity. Even with the stimulation of RNA, the ATPase activity is weak. Can only hydrolyze ATP but not other NTPs. The RNA stimulation of ATPase activity does not have a strong preference for the sequence and length of the RNA. However, ssRNA stimulates the ATPase activity much more strongly than dsRNA. Can unwind 5' or 3' overhangs or blunt end RNA duplexes in vitro. The ATPase and helicase activities are not influenced by U2AF2 and ALYREF/THOC4.
Pathways
  • Influenza A
  • mRNA surveillance pathway
  • RNA transport
  • Spliceosome
Reactions
Adenosine triphosphate + Water → ADP + Phosphate details
GO Classification
Biological Process
spliceosomal complex assembly
RNA secondary structure unwinding
intronless viral mRNA export from host nucleus
Cellular Component
cytoplasm
spliceosomal complex
nuclear speck
transcription export complex
Function
binding
catalytic activity
hydrolase activity
nucleoside binding
purine nucleoside binding
adenyl nucleotide binding
adenyl ribonucleotide binding
atp binding
atp-dependent helicase activity
atpase activity
atpase activity, coupled
nucleic acid binding
nucleoside-triphosphatase activity
helicase activity
hydrolase activity, acting on acid anhydrides
hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides
pyrophosphatase activity
Molecular Function
ATP-dependent RNA helicase activity
ATP binding
ATP-dependent protein binding
U4 snRNA binding
U6 snRNA binding
Cellular Location
  1. Nucleus
  2. Nucleus speckle
Gene Properties
Chromosome Location 6
Locus 6p21.3
SNPs BAT1
Gene Sequence
>1287 bp
ATGGCAGAGAACGATGTGGACAATGAGCTCTTGGACTATGAAGATGATGAGGTGGAGACA
GCAGCTGGGGGAGATGGGGCTGAGGCCCCTGCCAAGAAGGATGTCAAGGGCTCCTATGTC
TCCATCCACAGCTCTGGCTTTCGTGACTTCCTGCTCAAGCCAGAGTTGCTCCGGGCCATT
GTCGACTGTGGCTTTGAGCATCCGTCAGAAGTCCAGCATGAGTGCATCCCTCAGGCCATT
CTGGGAATGGATGTCCTGTGCCAGGCCAAGTCGGGCATGGGAAAGACAGCAGTGTTTGTC
TTGGCCACACTGCAACAGCTGGAGCCAGTTACTGGGCAGGTGTCTGTACTGGTGATGTGT
CACACTCGGGAGTTGGCTTTTCAGATCAGCAAGGAATATGAGCGCTTCTCTAAATACATG
CCCAATGTCAAGGTTGCTGTTTTTTTTGGTGGTCTGTCTATCAAGAAGGATGAAGAGGTG
CTGAAGAAGAACTGCCCGCATATCGTCGTGGGGACTCCAGGCCGTATCCTAGCCCTGGCT
CGAAATAAGAGCCTCAACCTCAAACACATTAAACACTTTATTTTGGATGAATGTGATAAG
ATGCTTGAACAGCTCGACATGCGTCGGGATGTCCAGGAAATTTTTCGCATGACCCCCCAC
GAGAAGCAGGTCATGATGTTCAGTGCTACCTTGAGCAAAGAGATCCGTCCAGTCTGCCGC
AAGTTCATGCAAGATCCAATGGAGATCTTCGTGGATGATGAGACGAAGTTGACGCTGCAT
GGGTTGCAGCAGTACTACGTGAAACTGAAGGACAACGAGAAGAACCGGAAGCTCTTTGAC
CTTCTGGATGTCCTTGAGTTCAACCAGGTGGTGATCTTTGTGAAGTCTGTGCAGCGGTGC
ATTGCCTTGGCCCAGCTACTAGTGGAGCAGAACTTCCCAGCCATTGCCATCCACCGTGGG
ATGCCCCAGGAGGAGAGGCTTTCTCGGTATCAGCAGTTTAAAGATTTTCAACGACGAATT
CTTGTGGCTACCAACCTATTTGGCCGAGGCATGGACATCGAGCGGGTGAACATTGCTTTT
AATTATGACATGCCTGAGGATTCTGACACCTACCTGCATCGGGTGGCCAGAGCAGGCCGG
TTTGGCACCAAGGGCTTGGCTATCACATTTGTGTCCGATGAGAATGATGCCAAGATCCTC
AATGATGTGCAGGATCGCTTTGAGGTCAATATTAGTGAGCTGCCTGATGAGATAGACATC
TCCTCCTACATTGAACAGACACGGTAG
Protein Properties
Number of Residues 428
Molecular Weight 48990.945
Theoretical pI 5.668
Pfam Domain Function
Signals Not Available
Transmembrane Regions Not Available
Protein Sequence
>Spliceosome RNA helicase BAT1
MAENDVDNELLDYEDDEVETAAGGDGAEAPAKKDVKGSYVSIHSSGFRDFLLKPELLRAI
VDCGFEHPSEVQHECIPQAILGMDVLCQAKSGMGKTAVFVLATLQQLEPVTGQVSVLVMC
HTRELAFQISKEYERFSKYMPNVKVAVFFGGLSIKKDEEVLKKNCPHIVVGTPGRILALA
RNKSLNLKHIKHFILDECDKMLEQLDMRRDVQEIFRMTPHEKQVMMFSATLSKEIRPVCR
KFMQDPMEIFVDDETKLTLHGLQQYYVKLKDNEKNRKLFDLLDVLEFNQVVIFVKSVQRC
IALAQLLVEQNFPAIAIHRGMPQEERLSRYQQFKDFQRRILVATNLFGRGMDIERVNIAF
NYDMPEDSDTYLHRVARAGRFGTKGLAITFVSDENDAKILNDVQDRFEVNISELPDEIDI
SSYIEQTR
GenBank ID Protein 587146
UniProtKB/Swiss-Prot ID Q13838
UniProtKB/Swiss-Prot Entry Name UAP56_HUMAN
PDB IDs
GenBank Gene ID Z37166
GeneCard ID BAT1
GenAtlas ID BAT1
HGNC ID HGNC:13917
References
General References
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