Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 10.34 kDa 
• Atom Count: 717 
• Residue Count: 89 
• Unique protein chains: 2

6K5T

Complex of SUMO1 and phosphorylated hcmv protein IE2

• DOI: 10.2210/pdb6K5T/pdb

• Classification: PROTEIN BINDING/TRANSCRIPTION
• Organism(s): Homo sapiens, Human herpesvirus 5 strain AD169
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-05-31 Released: 2019-08-07 
• Deposition Author(s): Tripathi, V., Chatterjee, K.S.

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Experimental Data Snapshot

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

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

• PubMed: 31371453 
• 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). 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.

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Organizational Affiliation: 

National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru-560065, India [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Small ubiquitin-related modifier 1	A	77	Homo sapiens	Mutation(s): 0  Gene Names: SUMO1, SMT3C, SMT3H3, UBL1, OK/SW-cl.43
Find proteins for P63165 (Homo sapiens) Explore P63165  Go to UniProtKB:  P63165
NIH Common Fund Data Resources
PHAROS  P63165 GTEx  ENSG00000116030

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
12-mer from Viral transcription factor IE2	B	12	Human herpesvirus 5 strain AD169	Mutation(s): 0  Gene Names: UL122
Find proteins for P19893 (Human cytomegalovirus (strain AD169)) Explore P19893  Go to UniProtKB:  P19893

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	B	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 6K5T Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2019-05-31 
• Released Date: 2019-08-07 
Deposition Author(s): Tripathi, V., Chatterjee, K.S.

Revision History 

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