Structure and expression of human dihydropteridine reductase

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Dihydropteridine reductase (DHPR) is crucial for aromatic amino acid metabolism.
• DHPR is an essential component of pterin-dependent hydroxylating systems.

Purpose of the Study:

• To isolate and characterize the cDNA for human DHPR.
• To confirm the identity and functionality of the human DHPR cDNA clone.

Main Methods:

• Screening a human liver cDNA library using an antibody against sheep DHPR.
• Determining nucleic acid and amino acid sequences of human DHPR.
• Gene transfer of recombinant human DHPR into COS cells.

Main Results:

• A full-length cDNA clone for human DHPR was isolated and sequenced.
• The human DHPR amino acid sequence showed high homology to sheep DHPR.
• Transfected COS cells expressed DHPR enzymatic activity.

Conclusions:

• The isolated cDNA clone represents the authentic, full-length human DHPR.
• The study provides a functional clone for human DHPR, essential for biochemical research.