7MER

Structure of ALDH4A1 complexed with trans-4-Hydroxy-L-proline


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.165 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural basis for the stereospecific inhibition of the dual proline/hydroxyproline catabolic enzyme ALDH4A1 by trans-4-hydroxy-L-proline.

Bogner, A.N.Stiers, K.M.McKay, C.M.Becker, D.F.Tanner, J.J.

(2021) Protein Sci 30: 1714-1722

  • DOI: https://doi.org/10.1002/pro.4131
  • Primary Citation of Related Structures:  
    7MER, 7MES

  • PubMed Abstract: 

    Aldehyde dehydrogenase 4A1 (ALDH4A1) catalyzes the final steps of both proline and hydroxyproline catabolism. It is a dual substrate enzyme that catalyzes the NAD + -dependent oxidations of L-glutamate-γ-semialdehyde to L-glutamate (proline metabolism), and 4-hydroxy-L-glutamate-γ-semialdehyde to 4-erythro-hydroxy-L-glutamate (hydroxyproline metabolism). Here we investigated the inhibition of mouse ALDH4A1 by the six stereoisomers of proline and 4-hydroxyproline using steady-state kinetics and X-ray crystallography. Trans-4-hydroxy-L-proline is the strongest of the inhibitors studied, characterized by a competitive inhibition constant of 0.7 mM, followed by L-proline (1.9 mM). The other compounds are very weak inhibitors (approximately 10 mM or greater). Insight into the selectivity for L-stereoisomers was obtained by solving crystal structures of ALDH4A1 complexed with trans-4-hydroxy-L-proline and trans-4-hydroxy-D-proline. The structures suggest that the 10-fold greater preference for the L-stereoisomer is due to a serine residue that hydrogen bonds to the amine group of trans-4-hydroxy-L-proline. In contrast, the amine group of the D-stereoisomer lacks a direct interaction with the enzyme due to a different orientation of the pyrrolidine ring. These results suggest that hydroxyproline catabolism is subject to substrate inhibition by trans-4-hydroxy-L-proline, analogous to the known inhibition of proline catabolism by L-proline. Also, drugs targeting the first enzyme of hydroxyproline catabolism, by elevating the level of trans-4-hydroxy-L-proline, may inadvertently impair proline catabolism by the inhibition of ALDH4A1.


  • Organizational Affiliation

    Department of Biochemistry, University of Missouri, Columbia, Missouri, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Delta-1-pyrroline-5-carboxylate dehydrogenase, mitochondrial
A, B
563Mus musculusMutation(s): 0 
Gene Names: Aldh4a1
EC: 1.2.1.88
UniProt
Find proteins for Q8CHT0 (Mus musculus)
Explore Q8CHT0 
Go to UniProtKB:  Q8CHT0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8CHT0
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
1PE
Query on 1PE

Download Ideal Coordinates CCD File 
D [auth A],
H [auth B]
PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
HYP (Subject of Investigation/LOI)
Query on HYP

Download Ideal Coordinates CCD File 
C [auth A],
F [auth B]
4-HYDROXYPROLINE
C5 H9 N O3
PMMYEEVYMWASQN-DMTCNVIQSA-N
PEG
Query on PEG

Download Ideal Coordinates CCD File 
G [auth B]DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.056α = 90
b = 94.6β = 90
c = 132.587γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1R01GM132640

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-09
    Type: Initial release
  • Version 1.1: 2021-07-28
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Database references, Refinement description