3MUC

MUCONATE CYCLOISOMERASE VARIANT I54V


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for the activity of two muconate cycloisomerase variants toward substituted muconates.

Schell, U.Helin, S.Kajander, T.Schlomann, M.Goldman, A.

(1999) Proteins 34: 125-136

  • Primary Citation of Related Structures:  
    2MUC, 3MUC

  • PubMed Abstract: 
  • We have refined to 2.3 A resolution two muconate cycloisomerase (MCIase) variant structures, F329I and I54V, that differ from each other and from wild-type in their activity toward cis,cis-muconate (CCM) and substituted CCMs. The working and free R-factors for F329I are 17 ...

    We have refined to 2.3 A resolution two muconate cycloisomerase (MCIase) variant structures, F329I and I54V, that differ from each other and from wild-type in their activity toward cis,cis-muconate (CCM) and substituted CCMs. The working and free R-factors for F329I are 17.4/21.6% and for I54V, 17.6/22.3% with good stereochemistry. Except for the mutated residue, there are no significant changes in structure. To understand the differences in enzymatic properties we docked substituted CCMs and CCM into the active sites of the variants and wild type. The extra space the mutations create appears to account for most of the enzymatic differences. The lack of other structural changes explains why, although structurally equivalent changes occur in chloromuconate cycloisomerase (CMCIase), the changes in themselves do not convert a MCIase into a dehalogenating CMCIase. Reanalysis of the CMCIase structure revealed only one general acid/base, K169. The structural implication is that, in 2-chloro-CCM conversion by CMCIase, the lactone ring of 5-chloromuconolactone rotates before dehalogenation to bring the acidic C4 proton next to K169. Therefore, K169 alone performs both required protonation and deprotonation steps, the first at C5 as in MCIase, and the second, after ring rotation, at C4. This distinguishes CMCIase from alpha/beta barrel isomerases and racemases, which use two different bases.


    Related Citations: 
    • The Refined X-Ray Structure of Muconate Lactonizing Enzyme from Pseudomonas Putida Prs2000 at 1.85 A Resolution
      Helin, S., Kahn, P.C., Guha, B.L., Mallows, D.G., Goldman, A.
      (1995) J Mol Biol 254: 918
    • Crystal Structure of Chloromuconate Cycloisomerase from Alcaligenes Eutrophus Jmp134 (Pjp4) at 3 A Resolution
      Hoier, H., Schloemann, M., Hammer, A., Glusker, J.P., Carrell, H.L., Goldman, A., Stezowski, J.J., Heinemann, U.
      (1994) Acta Crystallogr D Biol Crystallogr 50: 75

    Organizational Affiliation

    Institute for Microbiology, University of Stuttgart, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (MUCONATE CYCLOISOMERASE)A, B369Pseudomonas putidaMutation(s): 0 
Gene Names: catB
EC: 5.5.1.1
Find proteins for P08310 (Pseudomonas putida)
Explore P08310 
Go to UniProtKB:  P08310
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.6α = 90
b = 139.6β = 90
c = 84.2γ = 90
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-11-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance