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NADP-Dependent Aldehyde Dehydrogenase from Archaeon Pyrobaculum sp.1860: Structural and Functional Features.
Ekaterina Yu Bezsudnova1, Tatiana E Petrova2, Natalia V Artemova1
1A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave. 33, Bld. 2, Moscow 119071, Russia.
Archaea (Vancouver, B.C.)
|December 14, 2016
Summary
The first thermostable archaeal aldehyde dehydrogenase, AlDHPyr1147, functions optimally at high temperatures. Structural analysis reveals unique mechanisms for substrate oxidation and proton transfer, distinct from mesophilic counterparts.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Archaea possess unique enzymes adapted to extreme environments.
- NADP-dependent aldehyde dehydrogenases are crucial in metabolic pathways.
- Thermostable enzymes offer advantages in industrial applications.
Purpose of the Study:
- To functionally and structurally characterize the first identified archaeal thermostable NADP-dependent aldehyde dehydrogenase, AlDHPyr1147.
- To elucidate the structural basis for its thermostability and catalytic mechanism.
Main Methods:
- In vitro enzyme activity assays at varying temperatures.
- X-ray crystallography to determine apo, binary, and ternary complex structures.
- Comparative structural analysis with mesophilic analogues.
Main Results:
- AlDHPyr1147 exhibits irreversible oxidation of short aliphatic aldehydes between 60-85°C.
- Its NADP+ affinity at 60°C is comparable to mesophilic enzymes at 25°C.
- Structural data revealed strengthened dimeric contacts and unique conformational flexibility.
- Proton relay systems appear blocked, with proton release likely occurring via the substrate channel.
Conclusions:
- AlDHPyr1147 is a novel thermostable archaeal aldehyde dehydrogenase with unique structural features.
- Its catalytic mechanism differs from previously characterized dehydrogenases, particularly in proton transfer.
- The findings provide insights into enzyme adaptation to extreme thermal conditions.
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