5UTT

SrtA sortase from Actinomyces oris


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Cell-to-cell interaction requires optimal positioning of a pilus tip adhesin modulated by gram-positive transpeptidase enzymes.

Chang, C.Wu, C.Osipiuk, J.Siegel, S.D.Zhu, S.Liu, X.Joachimiak, A.Clubb, R.T.Das, A.Ton-That, H.

(2019) Proc Natl Acad Sci U S A 116: 18041-18049

  • DOI: 10.1073/pnas.1907733116
  • Primary Citation of Related Structures:  
    5UTT

  • PubMed Abstract: 
  • Assembly of pili on the gram-positive bacterial cell wall involves 2 conserved transpeptidase enzymes named sortases: One for polymerization of pilin subunits and another for anchoring pili to peptidoglycan. How this machine controls pilus length and ...

    Assembly of pili on the gram-positive bacterial cell wall involves 2 conserved transpeptidase enzymes named sortases: One for polymerization of pilin subunits and another for anchoring pili to peptidoglycan. How this machine controls pilus length and whether pilus length is critical for cell-to-cell interactions remain unknown. We report here in Actinomyces oris , a key colonizer in the development of oral biofilms, that genetic disruption of its housekeeping sortase SrtA generates exceedingly long pili, catalyzed by its pilus-specific sortase SrtC2 that possesses both pilus polymerization and cell wall anchoring functions. Remarkably, the srtA- deficient mutant fails to mediate interspecies interactions, or coaggregation, even though the coaggregation factor CafA is present at the pilus tip. Increasing ectopic expression of srtA in the mutant progressively shortens pilus length and restores coaggregation accordingly, while elevated levels of shaft pilins and SrtC2 produce long pili and block coaggregation by SrtA + bacteria. With structural studies, we uncovered 2 key structural elements in SrtA that partake in recognition of pilin substrates and regulate pilus length by inducing the capture and transfer of pilus polymers to the cell wall. Evidently, coaggregation requires proper positioning of the tip adhesin CafA via modulation of pilus length by the housekeeping sortase SrtA.


    Organizational Affiliation

    Molecular Biology Institute, University of California, Los Angeles, CA 90095.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SortaseABCD190Actinomyces orisMutation(s): 0 
Gene Names: AXE84_04905
Find proteins for A0A0X8K1J2 (Actinomyces oris)
Explore A0A0X8K1J2 
Go to UniProtKB:  A0A0X8K1J2
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download CCD File 
A, B, C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.183α = 90
b = 75.085β = 89.96
c = 77.652γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction
HKL-3000phasing
MOLREPphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272200700058C
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272201200026C

Revision History 

  • Version 1.0: 2017-03-01
    Type: Initial release
  • Version 1.1: 2017-09-20
    Changes: Author supporting evidence, Refinement description
  • Version 1.2: 2017-11-01
    Changes: Author supporting evidence
  • Version 1.3: 2019-08-21
    Changes: Data collection, Database references
  • Version 1.4: 2019-11-13
    Changes: Database references
  • Version 1.5: 2019-12-11
    Changes: Author supporting evidence