Non-structural protein NS1 - P03134 (NS1_MUMIP)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P03134: 7
 
Function
Multifunctional protein which displays endonuclease and helicase activities required for initiating and directing viral DNA replication (PubMed:12050365). Also plays a role in viral packaging and transactivation of several promoters (PubMed:7636987). Binds site-specifically to 2-3 approximate tandem copies of the tetranucleotide 5'TGGT3' within the origins of replication (Ori), unwinds this hairpin region and nicks one DNA strand thereby initiating the rolling circle replication (RCR) (PubMed:17898054, PubMed:12050365, PubMed:9349487). Cooperatively binds Ori with host PIF and probably other host factors, which activate the nickase function of NS1 (PubMed:11435581, PubMed:12050365). Becomes covalently attached to the 5' end of the nick and provides a 3'OH for priming DNA synthesis (PubMed:12050365). The helicase activity unwinds DNA in a 3'-5' direction on the longer strand (PubMed:12050365). Participates in the transcriptional regulation of several promoters including the viral p38 promoter that regulates the expression of VP1 and VP2 transcripts (PubMed:7636987, PubMed:8551622). Inhibits the host cell cycle during the G1/S transition, the S-phase, and the G2/M transition (PubMed:9188601, PubMed:11602746). These arrests may provide essential cellular factors for viral DNA replication. Promotes apoptosis in host cell (PubMed:21295324). UniProt
Pathway Maps
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Subunit Structure
Homooligomer; when bound to DNA (By similarity). Interacts with human SYNCRIP (PubMed:9847309). Interacts with host transcription factor SP1; this interaction allows high levels of viral P38 promoter transactivation by NS1 (PubMed:7799962, PubMed:9454706). UniProt
Domain
In the N-terminus, the endonuclease region is involved in binding to the origin of replication (By similarity). In the middle, there are the ATPase and helicase activities (By similarity). The C-terminus probably contains a transactivation domain (PubMed:7799962). UniProt
  • Other Gene names: NS1
This protein in other organisms (by gene name):
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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Validation Track

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Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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