Crystal structure of full-length endolysin R21 from phage 21

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.212 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Regulation of a muralytic enzyme by dynamic membrane topology.

Sun, Q.Kuty, G.F.Arockiasamy, A.Xu, M.Young, R.Sacchettini, J.C.

(2009) Nat Struct Mol Biol 16: 1192-1194

  • DOI: https://doi.org/10.1038/nsmb.1681
  • Primary Citation of Related Structures:  
    3HDE, 3HDF

  • PubMed Abstract: 

    R(21), the lysozyme of coliphage 21, has an N-terminal signal-anchor-release (SAR) domain that directs its secretion in a membrane-tethered, inactive form and then its release and activation in the periplasm. Both genetic and crystallographic studies show that the SAR domain, once extracted from the bilayer, refolds into the body of the enzyme and effects muralytic activation by repositioning one residue of the canonical lysozyme catalytic triad.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
165Enterobacteria phage P21Mutation(s): 0 
Gene Names: R
Membrane Entity: Yes 
Find proteins for P27359 (Enterobacteria phage P21)
Explore P27359 
Go to UniProtKB:  P27359
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27359
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.249α = 90
b = 94.814β = 90
c = 97.65γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-11-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description