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The entry | ==Crystal structure of the Rab27a fusion with Slp2a-RBDa1 effector for SF4 pocket drug targeting== | ||
<StructureSection load='7opp' size='340' side='right'caption='[[7opp]], [[Resolution|resolution]] 2.32Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[7opp]] is a 2 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=7OPP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OPP 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]] 2.32Å</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></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=7opp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7opp OCA], [https://pdbe.org/7opp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7opp RCSB], [https://www.ebi.ac.uk/pdbsum/7opp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7opp ProSAT]</span></td></tr> | |||
</table> | |||
== Disease == | |||
[https://www.uniprot.org/uniprot/RB27A_HUMAN RB27A_HUMAN] Griscelli syndrome type 2. The disease is caused by mutations affecting the gene represented in this entry. | |||
== Function == | |||
[https://www.uniprot.org/uniprot/SYTL2_HUMAN SYTL2_HUMAN] Isoform 1 acts as a RAB27A effector protein and plays a role in cytotoxic granule exocytosis in lymphocytes. It is required for cytotoxic granule docking at the immunologic synapse. Isoform 4 binds phosphatidylserine (PS) and phosphatidylinositol-4,5-bisphosphate (PIP2) and promotes the recruitment of glucagon-containing granules to the cell membrane in pancreatic alpha cells. Binding to PS is inhibited by Ca(2+) while binding to PIP2 is Ca(2+) insensitive.<ref>PMID:18812475</ref> <ref>PMID:17182843</ref> <ref>PMID:18266782</ref> [https://www.uniprot.org/uniprot/RB27A_HUMAN RB27A_HUMAN] Plays a role in cytotoxic granule exocytosis in lymphocytes. Required for both granule maturation and granule docking and priming at the immunologic synapse.<ref>PMID:18812475</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Rab27A is a small GTPase, which mediates transport and docking of secretory vesicles at the plasma membrane via protein-protein interactions (PPIs) with effector proteins. Rab27A promotes the growth and invasion of multiple cancer types such as breast, lung and pancreatic, by enhancing secretion of chemokines, metalloproteases and exosomes. The significant role of Rab27A in multiple cancer types and the minor role in adults suggest that Rab27A may be a suitable target to disrupt cancer metastasis. Similar to many GTPases, the flat topology of the Rab27A-effector PPI interface and the high affinity for GTP make it a challenging target for inhibition by small molecules. Reported co-crystal structures show that several effectors of Rab27A interact with the Rab27A SF4 pocket ('WF-binding pocket') via a conserved tryptophan-phenylalanine (WF) dipeptide motif. To obtain structural insight into the ligandability of this pocket, a novel construct was designed fusing Rab27A to part of an effector protein (fRab27A), allowing crystallisation of Rab27A in high throughput. The paradigm of KRas covalent inhibitor development highlights the challenge presented by GTPase proteins as targets. However, taking advantage of two cysteine residues, C123 and C188, that flank the WF pocket and are unique to Rab27A and Rab27B among the >60 Rab family proteins, we used the quantitative Irreversible Tethering (qIT) assay to identify the first covalent ligands for native Rab27A. The binding modes of two hits were elucidated by co-crystallisation with fRab27A, exemplifying a platform for identifying suitable lead fragments for future development of competitive inhibitors of the Rab27A-effector interaction interface, corroborating the use of covalent libraries to tackle challenging targets. | |||
Identification of the first structurally validated covalent ligands of the small GTPase RAB27A.,Jamshidiha M, Lanyon-Hogg T, Sutherell CL, Craven GB, Tersa M, De Vita E, Brustur D, Perez-Dorado I, Hassan S, Petracca R, Morgan RM, Sanz-Hernandez M, Norman JC, Armstrong A, Mann DJ, Cota E, Tate EW RSC Med Chem. 2021 Dec 16;13(2):150-155. doi: 10.1039/d1md00225b. eCollection, 2022 Feb 23. PMID:35308027<ref>PMID:35308027</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 7opp" style="background-color:#fffaf0;"></div> | ||
[[Category: Cota | |||
[[Category: De Vita | ==See Also== | ||
[[Category: | *[[Exophilin 3D structures|Exophilin 3D structures]] | ||
[[Category: | *[[GTP-binding protein 3D structures|GTP-binding protein 3D structures]] | ||
[[Category: Morgan | *[[Synaptotagmin 3D structures|Synaptotagmin 3D structures]] | ||
[[Category: | == References == | ||
[[Category: | <references/> | ||
[[Category: | __TOC__ | ||
</StructureSection> | |||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | |||
[[Category: Cota E]] | |||
[[Category: De Vita E]] | |||
[[Category: Jamshidiha M]] | |||
[[Category: Lanyon-Hogg T]] | |||
[[Category: Morgan RML]] | |||
[[Category: Perez-Dorado I]] | |||
[[Category: Sutherell CL]] | |||
[[Category: Tate EW]] | |||
[[Category: Tersa M]] | |||