2k3h: Difference between revisions
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==Structural determinants for Ca2+ and PIP2 binding by the C2A domain of rabphilin-3A== | ==Structural determinants for Ca2+ and PIP2 binding by the C2A domain of rabphilin-3A== | ||
<StructureSection load='2k3h' size='340' side='right'caption='[[2k3h | <StructureSection load='2k3h' size='340' side='right'caption='[[2k3h]]' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2k3h]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[2k3h]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2K3H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2K3H FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> | ||
<tr id=' | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2k3h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k3h OCA], [https://pdbe.org/2k3h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2k3h RCSB], [https://www.ebi.ac.uk/pdbsum/2k3h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2k3h ProSAT]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2k3h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k3h OCA], [https://pdbe.org/2k3h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2k3h RCSB], [https://www.ebi.ac.uk/pdbsum/2k3h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2k3h ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
[https://www.uniprot.org/uniprot/RP3A_MOUSE RP3A_MOUSE] Protein transport. Probably involved with Ras-related protein Rab-3A in synaptic vesicle traffic and/or synaptic vesicle fusion. Could play a role in neurotransmitter release by regulating membrane flow in the nerve terminal. | |||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: | [[Category: Mus musculus]] | ||
[[Category: Becker | [[Category: Becker S]] | ||
[[Category: Coudevylle | [[Category: Coudevylle N]] | ||
[[Category: Leonov | [[Category: Leonov A]] | ||
[[Category: Montaville | [[Category: Montaville P]] | ||
[[Category: Zweckstetter | [[Category: Zweckstetter M]] | ||
Latest revision as of 22:09, 29 May 2024
Structural determinants for Ca2+ and PIP2 binding by the C2A domain of rabphilin-3AStructural determinants for Ca2+ and PIP2 binding by the C2A domain of rabphilin-3A
Structural highlights
FunctionRP3A_MOUSE Protein transport. Probably involved with Ras-related protein Rab-3A in synaptic vesicle traffic and/or synaptic vesicle fusion. Could play a role in neurotransmitter release by regulating membrane flow in the nerve terminal. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedRabphilin-3A is a neuronal C2 domain tandem containing protein involved in vesicle trafficking. Both its C2 domains (C2A and C2B) are able to bind phosphatidylinositol 4,5-bisphosphate, a key player in the neurotransmitter release process. The rabphilin-3A C2A domain has previously been shown to bind inositol-1,4,5-trisphosphate (IP3; phosphatidylinositol 4,5-bisphosphate headgroup) in a Ca2+-dependent manner with a relatively high affinity (50 microm) in the presence of saturating concentrations of Ca2+. Moreover, IP3 and Ca2+ binding to the C2A domain mutually enhance each other. Here we present the Ca2+-bound solution structure of the C2A domain. Structural comparison with the previously published Ca2+-free crystal structure revealed that Ca2+ binding induces a conformational change of Ca2+ binding loop 3 (CBL3). Our IP3 binding studies as well as our IP3-C2A docking model show the active involvement of CBL3 in IP3 binding, suggesting that the conformational change on CBL3 upon Ca2+ binding enables the interaction with IP3 and vice versa, in line with a target-activated messenger affinity mechanism. Our data provide detailed structural insight into the functional properties of the rabphilin-3A C2A domain and reveal for the first time the structural determinants of a target-activated messenger affinity mechanism. Structural determinants for Ca2+ and phosphatidylinositol 4,5-bisphosphate binding by the C2A domain of rabphilin-3A.,Coudevylle N, Montaville P, Leonov A, Zweckstetter M, Becker S J Biol Chem. 2008 Dec 19;283(51):35918-28. Epub 2008 Oct 21. PMID:18945677[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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