4MLS

Crystal structure of the SpyTag and SpyCatcher-deltaN1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.984 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Analysis and Optimization of the Covalent Association between SpyCatcher and a Peptide Tag.

Li, L.Fierer, J.O.Rapoport, T.A.Howarth, M.

(2014) J.Mol.Biol. 426: 309-317

  • DOI: 10.1016/j.jmb.2013.10.021
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Peptide tagging is a key strategy for observing and isolating proteins. However, the interactions of proteins with peptides are nearly all rapidly reversible. Proteins tagged with the peptide SpyTag form an irreversible covalent bond to the SpyCatche ...

    Peptide tagging is a key strategy for observing and isolating proteins. However, the interactions of proteins with peptides are nearly all rapidly reversible. Proteins tagged with the peptide SpyTag form an irreversible covalent bond to the SpyCatcher protein via a spontaneous isopeptide linkage, thereby offering a genetically encoded way to create peptide interactions that resist force and harsh conditions. Here, we determined the crystal structure of the reconstituted covalent complex of SpyTag and SpyCatcher at 2.1Å resolution. The structure showed the expected reformation of the β-sandwich domain seen in the parental streptococcal adhesin, but flanking sequences at both N- and C-termini of SpyCatcher were disordered. In addition, only 10 out of 13 amino acids of the SpyTag peptide were observed to interact with SpyCatcher, pointing to specific contacts important for rapid split protein reconstitution. Based on these structural insights, we expressed a range of SpyCatcher variants and identified a minimized SpyCatcher, 32 residues shorter, that maintained rapid reaction with SpyTag. Together, these results give insight into split protein β-strand complementation and enhance a distinct approach to ultrastable molecular interaction.


    Organizational Affiliation

    Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fibronectin binding protein
A
95Streptococcus pyogenesMutation(s): 2 
Gene Names: fba2
Find proteins for Q8G9G1 (Streptococcus pyogenes)
Go to UniProtKB:  Q8G9G1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SpyTag
B
13N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.984 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.210 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 71.129α = 90.00
b = 30.474β = 98.93
c = 39.878γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-13
    Type: Initial release
  • Version 1.1: 2014-01-22
    Type: Database references