1IKI

COMPLEX OF STREPTOMYCES R61 DD-PEPTIDASE WITH THE PRODUCTS OF A SPECIFIC PEPTIDOGLYCAN SUBSTRATE FRAGMENT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.111 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structures of two kinetic intermediates reveal species specificity of penicillin-binding proteins.

McDonough, M.A.Anderson, J.W.Silvaggi, N.R.Pratt, R.F.Knox, J.R.Kelly, J.A.

(2002) J.Mol.Biol. 322: 111-122

  • Primary Citation of Related Structures:  1IKG

  • PubMed Abstract: 
  • Penicillin-binding proteins (PBPs), the target enzymes of beta-lactam antibiotics such as penicillins and cephalosporins, catalyze the final peptidoglycan cross-linking step of bacterial cell-wall biosynthesis. beta-Lactams inhibit this reaction beca ...

    Penicillin-binding proteins (PBPs), the target enzymes of beta-lactam antibiotics such as penicillins and cephalosporins, catalyze the final peptidoglycan cross-linking step of bacterial cell-wall biosynthesis. beta-Lactams inhibit this reaction because they mimic the D-alanyl-D-alanine peptide precursors of cell-wall structure. Prior crystallographic studies have described the site of beta-lactam binding and inhibition, but they have failed to show the binding of D-Ala-D-Ala substrates. We present here the first high-resolution crystallographic structures of a PBP, D-Ala-D-Ala-peptidase of Streptomyces sp. strain R61, non-covalently complexed with a highly specific fragment (glycyl-L-alpha-amino-epsilon-pimelyl-D-Ala-D-Ala) of the cell-wall precursor in both enzyme-substrate and enzyme-product forms. The 1.9A resolution structure of the enzyme-substrate Henri-Michaelis complex was achieved by using inactivated enzyme, which was formed by cross-linking two catalytically important residues Tyr159 and Lys65. The second structure at 1.25A resolution of the uncross-linked, active form of the DD-peptidase shows the non-covalent binding of the two products of the carboxypeptidase reaction. The well-defined substrate-binding site in the two crystallographic structures shows a subsite that is complementary to a portion of the natural cell-wall substrate that varies among bacterial species. In addition, the structures show the displacement of 11 water molecules from the active site, the location of residues responsible for substrate binding, and clearly demonstrate the necessity of Lys65 and or Tyr159 for the acylation step with the donor peptide. Comparison of the complexed structures described here with the structures of other known PBPs suggests the design of species-targeted antibiotics as a counter-strategy towards beta-lactamase-elicited bacterial resistance.


    Related Citations: 
    • BINDING OF CEPHALOTHIN AND CEFOTAXIME TO D-ALA-D-ALA-PEPTIDASE REVEALS A FUNCTIONAL BASIS OF A NATURAL MUTATION IN A LOW-AFFINITY PENICILLIN-BINDING PROTEIN AND IN EXTENDED-SPECTRUM BETA-LACTAMASES
      KUZIN, A.P.,LIU, H.,KELLY, J.A.,KNOX, J.R.
      (1995) Biochemistry 34: 9532
    • A 1.2-A SNAPSHOT OF THE FINAL STEP OF BACTERIAL CELL WALL BIOSYNTHESIS
      LEE, W.,MCDONOUGH, M.A.,KOTRA, L.,LI, Z.H.,SILVAGGI, N.R.,TAKEDA, Y.,KELLY, J.A.,MOBASHERY, S.
      (2001) Proc.Natl.Acad.Sci.USA 98: 1427
    • THE REFINED CRYSTALLOGRAPHIC STRUCTURE OF A DD-PEPTIDASE PENICILLIN-TARGET ENZYME AT 1.6 A RESOLUTION
      KELLY, J.A.,KUZIN, A.P.
      (1995) J.Mol.Biol. 254: 223


    Organizational Affiliation

    Department of Molecular and Cell Biology and Institute for Materials Science, University of Connecticut, Storrs 06269-3125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
D-ALANYL-D-ALANINE CARBOXYPEPTIDASE
A
349Streptomyces sp. (strain R61)EC: 3.4.16.4
Find proteins for P15555 (Streptomyces sp. (strain R61))
Go to UniProtKB:  P15555
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DAL
Query on DAL

Download SDF File 
Download CCD File 
A
D-ALANINE
C3 H7 N O2
QNAYBMKLOCPYGJ-UWTATZPHSA-N
 Ligand Interaction
REY
Query on REY

Download SDF File 
Download CCD File 
A
GLYCYL-L-ALPHA-AMINO-EPSILON-PIMELYL-D-ALANINE
C12 H21 N3 O6
ZMQJQOKNTYQVHO-SFYZADRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.111 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 50.859α = 90.00
b = 66.799β = 90.00
c = 100.263γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction
SHELXL-97refinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-09-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance
  • Version 1.3: 2018-01-31
    Type: Experimental preparation