2B44

Truncated S. aureus LytM, P 32 2 1 crystal form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.181 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal structures of active LytM.

Firczuk, M.Mucha, A.Bochtler, M.

(2005) J Mol Biol 354: 578-590

  • DOI: https://doi.org/10.1016/j.jmb.2005.09.082
  • Primary Citation of Related Structures:  
    2B0P, 2B13, 2B44

  • PubMed Abstract: 

    Lysostaphin-type enzymes are metalloendopeptidases that are present in bacteriophages and in bacteria. They share the catalytic domain, but normally contain other domains as well. The well-characterized enzymes in this group are all specific for the pentaglycine crosslinks in the cell walls of some Gram-positive bacterial species. Lysostaphin-type enzymes are synthesized as secreted preproenzymes and require proteolytic activation for maturation. Although lysostaphin, the prototypical peptidase in the group, is widely used as a tool in biotechnology and developed as an antistaphylococcal agent, the detailed structure of this enzyme is unknown. So far, only one lysostaphin-type enzyme, the Staphylococcus aureus autolysin LytM, has been crystallized in its full-length, inactive form. Here, we describe the synthesis of a convenient reporter substrate, characterize the metal and pH-dependence of an active LytM fragment, and present its crystal structure in three crystal forms at different pH values that either support or do not support activity. In all structures, we find an extended, long and narrow groove that has the active site at its bottom and is delineated on the sides by the most flexible regions of the molecule. In two cases, the groove is partially filled by a loop of a neighbouring molecule in the crystal. As the loop contains three consecutive glycine residues, this crystal packing effect supports the interpretation that the groove is the substrate-binding cleft. To characterize the substrate-binding mode more closely, a phosphinate analogue of tetraglycine was synthesized. Although tetraglycine is a substrate of the active LytM fragment, the phosphinate analogue turned out to be a very poor inhibitor. Crystals that were grown in its presence contained an L+-tartrate molecule from the crystallization buffer and not the phosphinate in the active site.


  • Organizational Affiliation

    International Institute of Molecular and Cell Biology, ul. Trojdena 4, 02-109 Warsaw, Poland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycyl-glycine endopeptidase lytM
A, B
133Staphylococcus aureusMutation(s): 0 
Gene Names: lytM
EC: 3.4.24.75
UniProt
Find proteins for O33599 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore O33599 
Go to UniProtKB:  O33599
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO33599
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.181 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.434α = 90
b = 100.434β = 90
c = 103.038γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-10
    Type: Initial release
  • Version 1.1: 2008-03-19
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description