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The PLD superfamily: insights into catalysis
1Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA. mwaite@wfubmc.edu
Biochimica Et Biophysica Acta
|July 30, 1999
Summary
Phospholipase D (PLD) superfamily research is advancing, revealing a two-active-site catalytic mechanism. A key histidine residue likely forms a covalent bond with phosphatidate during the reaction.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- The Phospholipase D (PLD) superfamily plays crucial roles in cell signaling and membrane trafficking.
- Understanding the precise catalytic mechanism and regulation of PLD enzymes is an ongoing area of research.
Purpose of the Study:
- To elucidate the catalytic mechanism of the PLD superfamily.
- To identify key residues involved in PLD enzymatic activity.
- To propose a model for PLD-catalyzed phosphatidate formation.
Main Methods:
- Structural analysis of PLD enzymes.
- Site-directed mutagenesis to create mutant proteins.
- Biochemical assays to assess enzyme activity.
Main Results:
- Structural data suggest a mechanism involving two active sites working together.
- Mutant protein studies indicate that several residues are essential for activity.
- Evidence points to a specific histidine residue becoming covalently linked to phosphatidate during catalysis.
Conclusions:
- The PLD superfamily likely employs a conserved catalytic mechanism involving dual active sites.
- A histidine residue is proposed as the key catalytic residue forming a covalent intermediate with phosphatidate.
- These findings provide new mechanistic insights into PLD superfamily function.