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Mouse phenylalanine hydroxylase. Homology and divergence from human phenylalanine hydroxylase
F D Ledley1, H E Grenett, B S Dunbar
1Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.
Abstract:
The laboratory mouse represents an important model for the study of phenylalanine metabolism and the pathochemistry of phenylketonuria, yet mouse phenylalanine hydroxylase (PAH) has not been extensively studied. We report the cloning and sequencing of a mouse PAH cDNA, the expression of enzymic activity from the mouse PAH cDNA clone and the identification of mouse PAH and human PAH by two-dimensional PAGE of liver samples. These data confirm the expected homology of mouse PAH and human PAH and suggest differences in the primary sequence and the phosphorylation state of the two enzymes.
Insights
Researchers cloned and sequenced mouse phenylalanine hydroxylase (PAH) cDNA, confirming homology with human PAH. Differences in primary sequence and phosphorylation state were identified, advancing phenylketonuria research.
Area of Science:
- Biochemistry
- Genetics
- Enzymology
Background:
- The laboratory mouse is a key model for studying phenylalanine metabolism and phenylketonuria.
- Mouse phenylalanine hydroxylase (PAH) has been understudied, limiting comprehensive research.
- Understanding mouse PAH is crucial for advancing phenylketonuria (PKU) research and therapeutic development.
Purpose of the Study:
- To clone and sequence mouse phenylalanine hydroxylase (PAH) cDNA.
- To express and confirm enzymic activity of the cloned mouse PAH.
- To compare mouse PAH with human PAH at the molecular level.
Main Methods:
- Cloning and sequencing of mouse PAH cDNA.
- Expression of enzymic activity from the mouse PAH cDNA clone.
- Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) of liver samples for enzyme identification.
- Comparative analysis of mouse and human PAH.
Main Results:
- Successful cloning and sequencing of mouse PAH cDNA.
- Demonstration of enzymic activity from the expressed mouse PAH clone.
- Identification of mouse PAH and human PAH in liver samples using 2D-PAGE.
- Confirmation of significant homology between mouse and human PAH.
- Identification of differences in primary sequence and phosphorylation state between mouse and human PAH.
Conclusions:
- The cloned mouse PAH cDNA is functional and exhibits enzymic activity.
- Mouse PAH shares homology with human PAH, validating its use as a model.
- Distinct differences in primary sequence and phosphorylation state exist between mouse and human PAH, offering insights into enzyme regulation and potential PKU variations.