1l4a: Difference between revisions
New page: left|200px<br /><applet load="1l4a" size="450" color="white" frame="true" align="right" spinBox="true" caption="1l4a, resolution 2.95Å" /> '''X-RAY STRUCTURE OF T... |
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[[Image:1l4a.gif|left|200px]]<br /><applet load="1l4a" size=" | [[Image:1l4a.gif|left|200px]]<br /><applet load="1l4a" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1l4a, resolution 2.95Å" /> | caption="1l4a, resolution 2.95Å" /> | ||
'''X-RAY STRUCTURE OF THE NEURONAL COMPLEXIN/SNARE COMPLEX FROM THE SQUID LOLIGO PEALEI'''<br /> | '''X-RAY STRUCTURE OF THE NEURONAL COMPLEXIN/SNARE COMPLEX FROM THE SQUID LOLIGO PEALEI'''<br /> | ||
==Overview== | ==Overview== | ||
Nerve terminals release neurotransmitters from vesicles into the synaptic | Nerve terminals release neurotransmitters from vesicles into the synaptic cleft upon transient increases in intracellular Ca(2+). This exocytotic process requires the formation of trans SNARE complexes and is regulated by accessory proteins including the complexins. Here we report the crystal structure of a squid core complexin-SNARE complex at 2.95-A resolution. A helical segment of complexin binds in anti-parallel fashion to the four-helix bundle of the core SNARE complex and interacts at its C terminus with syntaxin and synaptobrevin around the ionic zero layer of the SNARE complex. We propose that this structure is part of a multiprotein fusion machinery that regulates vesicle fusion at a late pre-fusion stage. Accordingly, Ca(2+) may initiate membrane fusion by acting directly or indirectly on complexin, thus allowing the conformational transitions of the trans SNARE complex that are thought to drive membrane fusion. | ||
==About this Structure== | ==About this Structure== | ||
1L4A is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Loligo_plei Loligo plei]. Full crystallographic information is available from [http:// | 1L4A is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Loligo_plei Loligo plei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L4A OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: snare complex]] | [[Category: snare complex]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:41:10 2008'' | ||
Revision as of 14:41, 21 February 2008
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X-RAY STRUCTURE OF THE NEURONAL COMPLEXIN/SNARE COMPLEX FROM THE SQUID LOLIGO PEALEI
OverviewOverview
Nerve terminals release neurotransmitters from vesicles into the synaptic cleft upon transient increases in intracellular Ca(2+). This exocytotic process requires the formation of trans SNARE complexes and is regulated by accessory proteins including the complexins. Here we report the crystal structure of a squid core complexin-SNARE complex at 2.95-A resolution. A helical segment of complexin binds in anti-parallel fashion to the four-helix bundle of the core SNARE complex and interacts at its C terminus with syntaxin and synaptobrevin around the ionic zero layer of the SNARE complex. We propose that this structure is part of a multiprotein fusion machinery that regulates vesicle fusion at a late pre-fusion stage. Accordingly, Ca(2+) may initiate membrane fusion by acting directly or indirectly on complexin, thus allowing the conformational transitions of the trans SNARE complex that are thought to drive membrane fusion.
About this StructureAbout this Structure
1L4A is a Protein complex structure of sequences from Loligo plei. Full crystallographic information is available from OCA.
ReferenceReference
X-ray structure of a neuronal complexin-SNARE complex from squid., Bracher A, Kadlec J, Betz H, Weissenhorn W, J Biol Chem. 2002 Jul 19;277(29):26517-23. Epub 2002 May 9. PMID:12004067
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