4NRM

Crystal structure of human ALKBH5 in complex with citrate and acetate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structures of the human RNA demethylase Alkbh5 reveal basis for substrate recognition

Feng, C.Liu, Y.Wang, G.Deng, Z.Zhang, Q.Wu, W.Tong, Y.Cheng, C.Chen, Z.

(2014) J.Biol.Chem. 289: 11571-11583

  • DOI: 10.1074/jbc.M113.546168
  • Primary Citation of Related Structures:  4NRO, 4NRP, 4NRQ, 4O7X

  • PubMed Abstract: 
  • N(6)-Methylation of adenosine is the most ubiquitous and abundant modification of nucleoside in eukaryotic mRNA and long non-coding RNA. This modification plays an essential role in the regulation of mRNA translation and RNA metabolism. Recently, hum ...

    N(6)-Methylation of adenosine is the most ubiquitous and abundant modification of nucleoside in eukaryotic mRNA and long non-coding RNA. This modification plays an essential role in the regulation of mRNA translation and RNA metabolism. Recently, human AlkB homolog 5 (Alkbh5) and fat mass- and obesity-associated protein (FTO) were shown to erase this methyl modification on mRNA. Here, we report five high resolution crystal structures of the catalytic core of Alkbh5 in complex with different ligands. Compared with other AlkB proteins, Alkbh5 displays several unique structural features on top of the conserved double-stranded β-helix fold typical of this protein family. Among the unique features, a distinct "lid" region of Alkbh5 plays a vital role in substrate recognition and catalysis. An unexpected disulfide bond between Cys-230 and Cys-267 is crucial for the selective binding of Alkbh5 to single-stranded RNA/DNA by bringing a "flipping" motif toward the central β-helix fold. We generated a substrate binding model of Alkbh5 based on a demethylation activity assay of several structure-guided site-directed mutants. Crystallographic and biochemical studies using various analogs of α-ketoglutarate revealed that the active site cavity of Alkbh5 is much smaller than that of FTO and preferentially binds small molecule inhibitors. Taken together, our findings provide a structural basis for understanding the substrate recognition specificity of Alkbh5 and offer a foundation for selective drug design against AlkB members.


    Organizational Affiliation

    From the State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RNA demethylase ALKBH5
A
230Homo sapiensGene Names: ALKBH5 (ABH5, OFOXD1)
EC: 1.14.11.-
Find proteins for Q6P6C2 (Homo sapiens)
Go to Gene View: ALKBH5
Go to UniProtKB:  Q6P6C2
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
FLC
Query on FLC

Download SDF File 
Download CCD File 
A
CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 56.726α = 90.00
b = 56.726β = 90.00
c = 146.315γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
BALBESphasing
HKL-2000data collection
HKL-2000data scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-19
    Type: Initial release
  • Version 1.1: 2015-10-21
    Type: Database references