The School of Molecular and Cellular Biology at the University of Illinois at Urbana-Champaign

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Event Detail Information

Event Detail Information

Speaker Dr. Axel Brunger
Date Mar 15, 2013
Time 12:00 pm - 1:00 pm  
Location B102 CLSL
Cost Free
Sponsor

Dr. Rudy Fratti

Contact Cara L. Day
Phone 217.333.2013
Event type Seminar
Views 2132
Originating Calendar Biochemistry Department Seminars
We used a combination of advanced optical imaging and cryogenic electron microscopy to explore membrane fusion between synthetic membranes that contained reconstituted synaptic proteins, including synaptotagmin and a family of protein receptors called SNAREs. When calcium ions were injected into the synthetic system, the basic characteristics of neurotransmitter release ' such as membrane fusion on a millisecond time scale ' was observed. Contrary to some theories of membrane fusion, the fastest fusion events did not begin or proceed via a discernible hemifusion intermediate state. Rather, these events proceeded from a 'point contact' state in which the membranes were close to each other (just 1-5 nm apart) without being fused, and were ready to undergo fast fusion once the calcium ions had been injected. When we introduced a protein called complexin, which is known to be important for fast neurotransmitter release in vivo, we observed more immediate fusion events and fewer events that involved a hemifusion intermediate.
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