5HHZ

Crystal structure of maize cytokinin oxidase/dehydrogenase 4 (ZmCKO4) in complex with 6-(3-methylpyrrol-1-yl)-9H-purine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Cytokinin metabolism in maize: Novel evidence of cytokinin abundance, interconversions and formation of a new trans-zeatin metabolic product with a weak anticytokinin activity.

Hluska, T.Dobrev, P.I.Tarkowska, D.Frebortova, J.Zalabak, D.Kopecny, D.Plihal, O.Kokas, F.Briozzo, P.Zatloukal, M.Motyka, V.Galuszka, P.

(2016) Plant Sci. 247: 127-137

  • DOI: 10.1016/j.plantsci.2016.03.014

  • PubMed Abstract: 
  • Cytokinins (CKs) are an important group of phytohormones. Their tightly regulated and balanced levels are essential for proper cell division and plant organ development. Here we report precise quantification of CK metabolites and other phytohormones ...

    Cytokinins (CKs) are an important group of phytohormones. Their tightly regulated and balanced levels are essential for proper cell division and plant organ development. Here we report precise quantification of CK metabolites and other phytohormones in maize reproductive organs in the course of pollination and kernel maturation. A novel enzymatic activity dependent on NADP(+) converting trans-zeatin (tZ) to 6-(3-methylpyrrol-1-yl)purine (MPP) was detected. MPP shows weak anticytokinin properties and inhibition of CK dehydrogenases due to their ability to bind to an active site in the opposite orientation than substrates. Although the physiological significance of tZ side-chain cyclization is not anticipated as the MPP occurrence in maize tissue is very low, properties of the novel CK metabolite indicate its potential for utilization in plant in vitro tissue culture. Furthermore, feeding experiments with different isoprenoid CKs revealed distinct preferences in glycosylation of tZ and cis-zeatin (cZ). While tZ is preferentially glucosylated at the N9 position, cZ forms mainly O-glucosides. Since O-glucosides, in contrast to N9-glucosides, are resistant to irreversible cleavage catalyzed by CK dehydrogenases, the observed preference of maize CK glycosyltransferases to O-glycosylate zeatin in the cis-position might be a reason why cZ derivatives are over-accumulated in different maize tissues and organs.


    Organizational Affiliation

    Department of Molecular Biology, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytokinin dehydrogenase 4
A
524Zea maysMutation(s): 0 
Gene Names: CKX4
EC: 1.5.99.12
Find proteins for E3T1W8 (Zea mays)
Go to UniProtKB:  E3T1W8
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZME
Query on ZME

Download SDF File 
Download CCD File 
A
6-(3-methyl-1H-pyrrol-1-yl)-9H-purine
C10 H9 N5
BCVQNVIMHTYJMD-UHFFFAOYSA-N
 Ligand Interaction
FAD
Query on FAD

Download SDF File 
Download CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.197 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 80.066α = 90.00
b = 80.066β = 90.00
c = 203.213γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
Cootmodel building
XDSdata reduction
DNAdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-05-04
    Type: Initial release