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Dysferlin is a large membrane protein involved in calcium-triggered resealing of the sarcolemma after injury. Although it is generally accepted that dysferlin is Ca2+ sensitive, the Ca2+ binding properties of dysferlin have not been characterized. In this study, we report an analysis of the Ca2+ and membrane binding properties of all seven C2 domains of dysferlin as well as a multi-C2 domain construct...
Decades ago it was proposed that exocytosis involves invagination of the target membrane, resulting in a highly localized site of contact between the bilayers destined to fuse. The vesicle protein synaptotagmin-I (syt) bends membranes in response to Ca 2+ , but whether this drives localized invagination of the target membrane to accelerate fusion has not been determined. Previous studies relied...
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