1BKH

MUCONATE LACTONIZING ENZYME FROM PSEUDOMONAS PUTIDA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Evolution of an enzyme active site: the structure of a new crystal form of muconate lactonizing enzyme compared with mandelate racemase and enolase.

Hasson, M.S.Schlichting, I.Moulai, J.Taylor, K.Barrett, W.Kenyon, G.L.Babbitt, P.C.Gerlt, J.A.Petsko, G.A.Ringe, D.

(1998) Proc.Natl.Acad.Sci.USA 95: 10396-10401


  • PubMed Abstract: 
  • Muconate lactonizing enzyme (MLE), a component of the beta-ketoadipate pathway of Pseudomonas putida, is a member of a family of related enzymes (the "enolase superfamily") that catalyze the abstraction of the alpha-proton of a carboxylic acid in the ...

    Muconate lactonizing enzyme (MLE), a component of the beta-ketoadipate pathway of Pseudomonas putida, is a member of a family of related enzymes (the "enolase superfamily") that catalyze the abstraction of the alpha-proton of a carboxylic acid in the context of different overall reactions. New untwinned crystal forms of MLE were obtained, one of which diffracts to better than 2.0-A resolution. The packing of the octameric enzyme in this crystal form is unusual, because the asymmetric unit contains three subunits. The structure of MLE presented here contains no bound metal ion, but is very similar to a recently determined Mn2+-bound structure. Thus, absence of the metal ion does not perturb the structure of the active site. The structures of enolase, mandelate racemase, and MLE were superimposed. A comparison of metal ligands suggests that enolase may retain some characteristics of the ancestor of this enzyme family. Comparison of other residues involved in catalysis indicates two unusual patterns of conservation: (i) that the position of catalytic atoms remains constant, although the residues that contain them are located at different points in the protein fold; and (ii) that the positions of catalytic residues in the protein scaffold are conserved, whereas their identities and roles in catalysis vary.


    Organizational Affiliation

    Departments of Biochemistry and Chemistry and the Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02254-9110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MUCONATE LACTONIZING ENZYME
A, B, C
369Pseudomonas putidaGene Names: catB
Find proteins for Q51958 (Pseudomonas putida)
Go to UniProtKB:  Q51958
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.157 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 136.180α = 90.00
b = 136.180β = 90.00
c = 265.110γ = 90.00
Software Package:
Software NamePurpose
PROCESSdata reduction
X-PLORphasing
X-PLORrefinement
X-PLORmodel building
MOSFLMdata reduction
RIGAKUdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-10-21
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance