Related Experiment Videos
Structure and properties of an engineered transketolase from maize
Stefan Gerhardt1, Stefanie Echt, Marco Busch
1Lehrstuhl für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
Plant Physiology
|August 13, 2003
Summary
Researchers cloned the maize plastid transketolase (TK) gene and determined its structure. The enzyme is a homodimer similar to yeast TK, with active sites at the subunit interface.
Area of Science:
- Plant molecular biology
- Enzymology
- Structural biology
Background:
- Plastid transketolase (TK) is a key enzyme in the pentose phosphate pathway.
- Understanding TK structure is crucial for plant metabolic engineering.
Purpose of the Study:
- To clone and characterize the gene for maize plastid transketolase (TK).
- To elucidate the three-dimensional structure of maize plastid TK.
Main Methods:
- Gene cloning using Southern blotting with a heterologous probe.
- Recombinant protein expression in E. coli and purification.
- X-ray crystallography and molecular replacement for structure determination.
Main Results:
- The maize plastid TK gene was successfully cloned.
- A functional recombinant enzyme was produced and crystallized.
- The crystal structure revealed a C2 symmetric homodimer, similar to yeast TK, with active sites at the subunit interface.
Conclusions:
- The structure of maize plastid TK provides insights into its catalytic mechanism.
- This structural information can be utilized for optimizing metabolic pathways in plants.