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Bacterial phosphatidylinositol-specific phospholipase C: structure, function, and interaction with lipids.
1Institute of Molecular Biology and Department of Chemistry, University of Oregon, Eugene, OR 97403, USA. hayes@molbio.uoregon.edu
Biochimica Et Biophysica Acta
|November 26, 1999
Summary
Bacterial phosphatidylinositol-specific phospholipase C (PI-PLC) enzymes are small, water-soluble proteins. They share structural and catalytic similarities with mammalian PI-PLCs, aiding in functional region identification.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Bacterial phosphatidylinositol-specific phospholipase C (PI-PLC) are enzymes that hydrolyze membrane lipids like phosphatidylinositol (PI).
- Understanding their structure and function is crucial for comparative studies with eukaryotic counterparts.
Purpose of the Study:
- To review the crystal structure, NMR data, and enzymatic mechanisms of bacterial PI-PLCs.
- To highlight the structural similarities and sequence conservation among bacterial PI-PLCs and with mammalian PI-PLCs.
Main Methods:
- Review of existing literature on bacterial PI-PLC crystal structures and NMR data.
- Analysis of enzymatic mechanisms and sequence similarities across different bacterial species.
- Comparative structural analysis with mammalian PI-PLCs.
Main Results:
- Bacterial PI-PLCs are single-domain enzymes with a (betaalpha)(8)-barrel (TIM barrel) fold.
- These enzymes are calcium-independent and exhibit weak membrane interactions.
- Extensive sequence similarity exists among bacterial PI-PLCs, including catalytic residues.
- Bacterial PI-PLCs share structural resemblance with the catalytic domain of mammalian PI-PLCs.
Conclusions:
- Comparative studies of prokaryotic and eukaryotic PI-PLCs are valuable for identifying structurally and functionally important protein regions.
- The conserved structural and catalytic features suggest a shared evolutionary origin or functional necessity.