Two novel brain proteins, CaBP33 and CaBP37, are calcium‐dependent phospholipid‐ and membrane‐binding proteins
- 12 March 1990
- journal article
- Published by Wiley in FEBS Letters
- Vol. 262 (1), 72-76
- https://doi.org/10.1016/0014-5793(90)80157-e
Abstract
Two acidic Ca2+ -binding proteins (CaBP33 and CaBP37) purified from bovine brain have been characterized in terms of immunological properties, heat-sensitivity, electrophoretic mobility, and Ca2+-dependent binding to negatively charged phospholipids and to brain membranes. They were induced to bind to membranes by homogenization of brain tissue in the presence of CaCl2. The membrane-bound CaBP33/CaBP37 mixture resisted extraction with detergents and was solubilized with high concentrations of EGTA/KC1. However, apparent Ca2+-independent binding of the two proteins to membranes seemed to occur as well. This latter fraction of membrane-bound CaBP33 and CaBP37 could be solubilized with Triton X-100, indicating that brain membranes normally contain the two proteins as intrinsic components.Keywords
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