4ZVX

Structure of apo human ALDH7A1 in space group P4212


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Basis of Substrate Recognition by Aldehyde Dehydrogenase 7A1.

Luo, M.Tanner, J.J.

(2015) Biochemistry 54: 5513-5522

  • DOI: 10.1021/acs.biochem.5b00754
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Aldehyde dehydrogenase 7A1 (ALDH7A1) is part of lysine catabolism and catalyzes the NAD(+)-dependent oxidation of α-aminoadipate semialdehyde to α-aminoadipate. Herein, we describe a structural study of human ALDH7A1 focused on substrate recognition. ...

    Aldehyde dehydrogenase 7A1 (ALDH7A1) is part of lysine catabolism and catalyzes the NAD(+)-dependent oxidation of α-aminoadipate semialdehyde to α-aminoadipate. Herein, we describe a structural study of human ALDH7A1 focused on substrate recognition. Five crystal structures and small-angle X-ray scattering data are reported, including the first crystal structure of any ALDH7 family member complexed with α-aminoadipate. The product binds with the ε-carboxylate in the oxyanion hole, the aliphatic chain packed into an aromatic box, and the distal end of the product anchored by electrostatic interactions with five conserved residues. This binding mode resembles that of glutamate bound to the proline catabolic enzyme ALDH4A1. Analysis of ALDH7A1 and ALDH4A1 structures suggests key interactions that underlie substrate discrimination. Structures of apo ALDH7A1 reveal dramatic conformational differences from the product complex. Product binding is associated with a 16 Å movement of the C-terminus into the active site, which stabilizes the active conformation of the aldehyde substrate anchor loop. The fact that the C-terminus is part of the active site was hitherto unknown. Interestingly, the C-terminus and aldehyde anchor loop are disordered in a new tetragonal crystal form of the apoenzyme, implying that these parts of the enzyme are highly flexible. Our results suggest that the active site of ALDH7A1 is disassembled when the aldehyde site is vacant, and the C-terminus is a mobile element that forms quaternary structural interactions that aid aldehyde binding. These results are relevant to the c.1512delG genetic deletion associated with pyridoxine-dependent epilepsy, which alters the C-terminus of ALDH7A1.


    Organizational Affiliation

    Department of Chemistry, University of Missouri-Columbia , Columbia, Missouri 65211, United States.,Department of Biochemistry, University of Missouri-Columbia , Columbia, Missouri 65211, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-aminoadipic semialdehyde dehydrogenase
A, B
513Homo sapiensMutation(s): 0 
Gene Names: ALDH7A1 (ATQ1)
EC: 1.2.1.31
Find proteins for P49419 (Homo sapiens)
Go to Gene View: ALDH7A1
Go to UniProtKB:  P49419
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.169 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 159.323α = 90.00
b = 159.323β = 90.00
c = 79.801γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2015-05-18 
  • Released Date: 2015-08-26 
  • Deposition Author(s): Tanner, J.J.

Revision History 

  • Version 1.0: 2015-08-26
    Type: Initial release
  • Version 1.1: 2015-09-16
    Type: Database references