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Structural Basis of Substrate Recognition by Aldehyde Dehydrogenase 7A1
Min Luo1, John J Tanner1,2
1Department of Chemistry, University of Missouri-Columbia , Columbia, Missouri 65211, United States.
Biochemistry
|August 12, 2015
Summary
Aldehyde dehydrogenase 7A1 (ALDH7A1) undergoes significant structural changes upon product binding, revealing a flexible C-terminus crucial for active site formation and substrate recognition in lysine catabolism.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Aldehyde dehydrogenase 7A1 (ALDH7A1) plays a key role in lysine catabolism, catalyzing the oxidation of α-aminoadipate semialdehyde.
- Understanding ALDH7A1's substrate recognition is crucial, particularly given its link to pyridoxine-dependent epilepsy.
Purpose of the Study:
- To elucidate the structural basis of substrate recognition in human ALDH7A1.
- To investigate the conformational changes associated with product binding and their implications for enzyme activity.
Main Methods:
- X-ray crystallography was employed to determine five distinct crystal structures of human ALDH7A1.
- Small-angle X-ray scattering (SAXS) data were collected to complement structural insights.
- Comparative structural analysis with ALDH4A1 was performed to understand substrate discrimination.
Main Results:
- The first crystal structure of an ALDH7 family member complexed with its product, α-aminoadipate, was determined.
- Product binding induces a significant conformational change, involving a 16 Å movement of the C-terminus into the active site.
- The C-terminus and aldehyde anchor loop are flexible and disordered in the apoenzyme, suggesting a dynamic active site assembly.
Conclusions:
- ALDH7A1's active site is not pre-formed but assembled upon substrate or product binding, with the C-terminus acting as a mobile element.
- The identified substrate binding mode and conformational flexibility provide insights into ALDH7A1 function and substrate discrimination.
- These findings are relevant to understanding the molecular basis of pyridoxine-dependent epilepsy caused by ALDH7A1 mutations.
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