6K5R

Complex of SUMO2 with Phosphorylated viral SIM IE2


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Casein kinase-2-mediated phosphorylation increases the SUMO-dependent activity of the cytomegalovirus transactivator IE2.

Tripathi, V.Chatterjee, K.S.Das, R.

(2019) J Biol Chem 294: 14546-14561

  • DOI: 10.1074/jbc.RA119.009601
  • Primary Citation of Related Structures:  
    6K5R, 6K5T

  • PubMed Abstract: 
  • Many viral factors manipulate the host post-translational modification (PTM) machinery for efficient viral replication. In particular, phosphorylation and SUMOylation can distinctly regulate the activity of the human cytomegalovirus (HCMV) transactivator immediate early 2 (IE2) ...

    Many viral factors manipulate the host post-translational modification (PTM) machinery for efficient viral replication. In particular, phosphorylation and SUMOylation can distinctly regulate the activity of the human cytomegalovirus (HCMV) transactivator immediate early 2 (IE2). However, the molecular mechanism of this process is unknown. Using various structural, biochemical, and cell-based approaches, here we uncovered that IE2 exploits a cross-talk between phosphorylation and SUMOylation. A scan for small ubiquitin-like modifier (SUMO)-interacting motifs (SIMs) revealed two SIMs in IE2, and a real-time SUMOylation assay indicated that the N-terminal SIM (IE2-SIM1) enhances IE2 SUMOylation up to 4-fold. Kinetic analysis and structural studies disclosed that IE2 is a SUMO cis- E3 ligase. We also found that two putative casein kinase 2 (CK2) sites adjacent to IE2-SIM1 are phosphorylated in vitro and in cells. The phosphorylation drastically increased IE2-SUMO affinity, IE2 SUMOylation, and cis- E3 activity of IE2. Additional salt bridges between the phosphoserines and SUMO accounted for the increased IE2-SUMO affinity. Phosphorylation also enhanced the SUMO-dependent transactivation activity and auto-repression activity of IE2. Together, our findings highlight a novel mechanism whereby SUMOylation and phosphorylation of the viral cis- E3 ligase and transactivator protein IE2 work in tandem to enable transcriptional regulation of viral gene.


    Organizational Affiliation

    National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru-560065, India rana@ncbs.res.in.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Small ubiquitin-related modifier 3A77Homo sapiensMutation(s): 0 
Gene Names: SUMO3SMT3ASMT3H1
Find proteins for P55854 (Homo sapiens)
Explore P55854 
Go to UniProtKB:  P55854
NIH Common Fund Data Resources
PHAROS:  P55854
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ASP-THR-ALA-GLY-CYS-ILE-VAL-ILE-SEP-ASP-SEP-GLUB12Human herpesvirus 5 strain AD169Mutation(s): 0 
Gene Names: UL122
Find proteins for P19893 (Human cytomegalovirus (strain AD169))
Explore P19893 
Go to UniProtKB:  P19893
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
BL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 6K5R Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Database references