451. Effect of detergent treatment on the cross-linking of purified chromaffin granule membranes with F-actin.
- Author
-
Morita K and Pollard HB
- Subjects
- Actins metabolism, Adrenal Medulla chemistry, Animals, Cattle, Cholic Acids pharmacology, Chromaffin Granules metabolism, Deoxycholic Acid pharmacology, Intracellular Membranes metabolism, Microfilament Proteins drug effects, Microfilament Proteins metabolism, Octoxynol pharmacology, Viscosity drug effects, Actins drug effects, Chromaffin Granules drug effects, Detergents pharmacology, Intracellular Membranes drug effects
- Abstract
Chromaffin granule-microfilament interaction has previously been proposed to play a potential role in the regulation of dopamine uptake into the granules as well as catecholamine secretion in the adrenal medullary cell. However, the microfilament-binding site on the granule surface has not yet been identified. To establish the conditions for solubilization of the binding site, the effects of different-type detergents on the cross-linking of chromaffin granule membranes with F-actin were examined. The cross-linking activity was abolished by treatment of the granule membranes with deoxycholate (DOC), but not Triton X-100 (TX100) and CHAPS. The addition of DOC-extract decreased the viscosity of F-actin solution, suggesting that solubilized proteins bind to F-actin, but not cause the cross-linking of actin filaments. These results indicate that the actin-binding site can be solubilized from chromaffin granule membranes by DOC treatment.
- Published
- 1997
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