Crystal Structure of VpsO (VC0937) Kinase domain

Experimental Data Snapshot

  • Resolution: 2.87 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 

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This is version 1.3 of the entry. See complete history


A tyrosine phosphoregulatory system controls exopolysaccharide biosynthesis and biofilm formation in Vibrio cholerae.

Schwechheimer, C.Hebert, K.Tripathi, S.Singh, P.K.Floyd, K.A.Brown, E.R.Porcella, M.E.Osorio, J.Kiblen, J.T.M.Pagliai, F.A.Drescher, K.Rubin, S.M.Yildiz, F.H.

(2020) PLoS Pathog 16: e1008745-e1008745

  • DOI: https://doi.org/10.1371/journal.ppat.1008745
  • Primary Citation of Related Structures:  
    6U1P, 6U1Q

  • PubMed Abstract: 

    Production of an extracellular matrix is essential for biofilm formation, as this matrix both secures and protects the cells it encases. Mechanisms underlying production and assembly of matrices are poorly understood. Vibrio cholerae, relies heavily on biofilm formation for survival, infectivity, and transmission. Biofilm formation requires Vibrio polysaccharide (VPS), which is produced by vps gene-products, yet the function of these products remains unknown. Here, we demonstrate that the vps gene-products vpsO and vpsU encode respectively for a tyrosine kinase and a cognate tyrosine phosphatase. Collectively, VpsO and VpsU act as a tyrosine phosphoregulatory system to modulate VPS production. We present structures of VpsU and the kinase domain of VpsO, and we report observed autocatalytic tyrosine phosphorylation of the VpsO C-terminal tail. The position and amount of tyrosine phosphorylation in the VpsO C-terminal tail represses VPS production and biofilm formation through a mechanism involving the modulation of VpsO oligomerization. We found that tyrosine phosphorylation enhances stability of VpsO. Regulation of VpsO phosphorylation by the phosphatase VpsU is vital for maintaining native VPS levels. This study provides new insights into the mechanism and regulation of VPS production and establishes general principles of biofilm matrix production and its inhibition.

  • Organizational Affiliation

    Department of Microbiology and Environmental Toxicology, University of California-Santa Cruz, Santa Cruz, California, United States of America.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
235Vibrio choleraeMutation(s): 3 
Gene Names: vpsO
Find proteins for Q9KTG5 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KTG5 
Go to UniProtKB:  Q9KTG5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KTG5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.87 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 171.43α = 90
b = 171.43β = 90
c = 44.39γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-19
    Type: Initial release
  • Version 1.1: 2020-10-07
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description
  • Version 1.3: 2023-11-15
    Changes: Data collection