1J0E

ACC deaminase mutant reacton intermediate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Reaction intermediate structures of 1-aminocyclopropane-1-carboxylate deaminase: insight into PLP-dependent cyclopropane ring-opening reaction

Ose, T.Fujino, A.Yao, M.Watanabe, N.Honma, M.Tanaka, I.

(2003) J.BIOL.CHEM. 278: 41069-41076

  • DOI: 10.1074/jbc.M305865200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The pyridoxal 5'-phosphate-dependent enzymes have been evolved to catalyze diverse substrates and to cause the reaction to vary. 1-Aminocyclopropane-1-carboxylate deaminase catalyzes the cyclopropane ring-opening reaction followed by deamination spec ...

    The pyridoxal 5'-phosphate-dependent enzymes have been evolved to catalyze diverse substrates and to cause the reaction to vary. 1-Aminocyclopropane-1-carboxylate deaminase catalyzes the cyclopropane ring-opening reaction followed by deamination specifically. Since it was discovered in 1978, the enzyme has been widely investigated from the mechanistic and physiological viewpoints because the substrate is a precursor of the plant hormone ethylene and the enzymatic reaction includes a cyclopropane ring-opening. We have previously reported the crystal structure of the native enzyme. Here we report the crystal structures of the two reaction intermediates created by the mutagenesis complexed with the substrate. The substrate was validated in the active site of two forms: 1). covalent-bonded external aldimine with the coenzyme in the K51T form and 2). the non-covalent interaction around the coenzyme in the Y295F form. The orientations of the substrate in both structures were quite different form each other. In concert with other site-specific mutation experiments, this experiment revealed the ingenious and unique strategies that are used to achieve the specific activity. The substrate incorporated into the active site is reactivated by a two-phenol charge relay system to lead to the formation of a Schiff base with the coenzyme. The catalytic Lys51 residue may play a novel role to abstract the methylene proton from the substrate in cooperation with other factors, the carboxylate group of the substrate and the electron-adjusting apparatuses of the coenzyme.


    Related Citations: 
    • Crystal structure of 1-aminocyclopropane-1-carboxylate deaminase from Hansenula saturnus
      Yao, M.,Ose, T.,Sugimoto, H.,Horiuchi, A.,Nakagawa, A.,Wakatsuki, S.,Yokoi, D.,Murakami, T.,Honma, M.,Tanaka, I.
      (2000) J.Biol.Chem. 275: 34557


    Organizational Affiliation

    Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
1-aminocyclopropane-1-carboxylate deaminase
A, B, C, D
341Cyberlindnera saturnusMutation(s): 2 
EC: 3.5.99.7
Find proteins for Q7M523 (Cyberlindnera saturnus)
Go to UniProtKB:  Q7M523
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1AC
Query on 1AC

Download SDF File 
Download CCD File 
A, B, C, D
1-AMINOCYCLOPROPANECARBOXYLIC ACID
C4 H7 N O2
PAJPWUMXBYXFCZ-UHFFFAOYSA-N
 Ligand Interaction
PLP
Query on PLP

Download SDF File 
Download CCD File 
A, B, C, D
PYRIDOXAL-5'-PHOSPHATE
VITAMIN B6 Phosphate
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.202 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 65.400α = 90.00
b = 269.586β = 90.00
c = 186.913γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-12
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance