What is the Ca2+ binding protein that regulates transmitter release?

[djflush]

and what is the name of the Ca2+ binding protein that is believed to underlie Ca2+ regulation of transmitter release

 

[GoldShadow]

I believe you are looking for synaptotagmin:
http://en.wikipedia.org/wiki/Synaptotagmins

 

[djflush]

Ok But

does this mean that syntaxin is the protein causing the binding but what molecule does it pass through to enter the presynaptic terminal