View source for 4lhw


==Crystal structure of Rab8 in its active GppNHp-bound form==
<StructureSection load='4lhw' size='340' side='right'caption='[[4lhw]], [[Resolution|resolution]] 1.55&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4lhw]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LHW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LHW FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.55&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GNP:PHOSPHOAMINOPHOSPHONIC+ACID-GUANYLATE+ESTER'>GNP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</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=4lhw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4lhw OCA], [https://pdbe.org/4lhw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4lhw RCSB], [https://www.ebi.ac.uk/pdbsum/4lhw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4lhw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RAB8A_HUMAN RAB8A_HUMAN] May be involved in vesicular trafficking and neurotransmitter release. Together with RAB11A, RAB3IP, the exocyst complex, PARD3, PRKCI, ANXA2, CDC42 and DNMBP promotes transcytosis of PODXL to the apical membrane initiation sites (AMIS), apical surface formation and lumenogenesis. Together with MYO5B and RAB11A participates in epithelial cell polarization.<ref>PMID:20890297</ref> <ref>PMID:21282656</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Small G-proteins (G) of the Ras-superfamily control the temporal and spatial coordination of intracellular signaling networks by acting as molecular on/off switches. Guanine nucleotide exchange factors (GEFs) regulate the activation of these G-proteins through catalytic replace-ment of guanosine diphosphate (GDP) by gua-nosine triphosphate (GTP). During nucleotide exchange, three distinct substrate-enzyme complexes occur: A ternary complex with GDP at the start of reaction (G:GDP:GEF), an intermediary nucleotide-free binary complex (G:GEF), and a ternary GTP-complex after productive G-protein activation (G:GTP:GEF). Here we show structural snapshots of the full nucleotide-exchange reaction sequence together with the G-protein substrates and products using Rabin8/GRAB (GEF) and Rab8 (G-protein) as a model system. Together with a thorough enzymatic characterization, our data provide a detailed view into the mechanism of Rabin8/GRAB mediated nucleotide exchange.

Intermediates in the Guanine Nucleotide Exchange Reaction of Rab8 Catalyzed by Rabin8/GRAB.,Guo Z, Hou X, Goody RS, Itzen A J Biol Chem. 2013 Sep 26. PMID:24072714<ref>PMID:24072714</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4lhw" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ras-related protein Rab 3D structures|Ras-related protein Rab 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Goody RS]]
[[Category: Guo Z]]
[[Category: Hou XM]]
[[Category: Itzen A]]