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Purification and characterization of canine myocardial cytosolic phospholipase A2. A calcium-independent phospholipase with absolute f1-2 regiospecificity for diradyl glycerophospholipids.
Open accessAbstract
Recently, we identified a novel calcium-independent, plasmalogen-selective phospholipase A2 activity in canine myocardial cytosol which represents the major measurable phospholipase A2 activity in myocardial homogenates (Wolf, R. A., and Gross, R. W. (1985) J. Biol. Chem. 260, 7295-7303). We now report the 154,000-fold purification of this phospholipase A2 to homogeneity through utilization of sequential anion exchange, chromatofocusing, affinity, Mono Q, and hydroxylapatite chromatographies. The purified enzyme had a molecular mass of 40 kDa, possessed a specific activity of 227 mumol/mg min, had a pH optimum of 6.4, and catalyzed the regiospecific cleavage of the sn-2 fatty acid from diradyl glycerophospholipids. The purified polypeptide was remarkable for its ability to selectively hydrolyze plasmenylcholine in homogeneous vesicles (subclass rank order: plasmenylcholine greater than alkyl-ether choline glycerophospholipid greater than phosphatidylcholine) as well as in mixed bilayers comprised of equimolar plasmenylcholine/phosphatidylcholine. Purified myocardial phospholipase A2 also possessed selectivity for hydrolysis of phospholipids containing arachidonic acid at the sn-2 position in comparison to oleic or palmitic acid. Taken together, these results constitute the first purification of a calcium-independent phospholipase with absolute regiospecificity for cleavage of the sn-2 acyl linkage in diradyl glycerophospholipids and demonstrate that myocardial phospholipase A2 has kinetic characteristics which are anticipated to result in the selective hydrolysis of sarcolemmal phospholipids during myocardial ischemia.
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Cited by
The Ca2(+)-sensitive cytosolic phospholipase A2 is a 100-kDa protein in human monoblast U937 cells.
Kramer, R. M., Roberts, E. F., Manetta, J., & Putnam, J. E. (1991) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(19)67782-3 · Cited by 411
Mammalian non-pancreatic phospholipases A2
Kudo, I., Murakami, M., Hara, S., & Inoue, K. (1993) · Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism · doi:10.1016/0005-2760(93)90003-r · Cited by 351
Glaser, P. E., & Gross, R. W. (1995) · Biochemistry · doi:10.1021/bi00038a013 · Cited by 210
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Metadata
- Authors
- Hazen, S. L., Stuppy, R. J., & Gross, R. W.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1990-06
- Volume
- 265
- Issue
- 18
- Pages
- 10622-10630
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1567170846
- Cited by
- 230
- References
- 0
- FWCI
- 12.44
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- CoChat. (2026). Citation check: Purification and characterization of canine myocardial cytosolic phospholipase A2. A calcium-independent phospholipase with absolute f1-2 regiospecificity for diradyl glycerophospholipids. https://app.cochat.ai/papers/10.1016/s0021-9258(18)86992-7
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- Hazen, S. L., Stuppy, R. J., & Gross, R. W. (1990). Purification and characterization of canine myocardial cytosolic phospholipase A2. A calcium-independent phospholipase with absolute f1-2 regiospecificity for diradyl glycerophospholipids. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(18)86992-7
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