View source for 5xag


==Crystal structure of tubulin-stathmin-TTL-Compound Z2 complex==
<StructureSection load='5xag' size='340' side='right'caption='[[5xag]], [[Resolution|resolution]] 2.56&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5xag]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus], [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus] and [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5XAG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5XAG 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]] 2.56&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=93X:(3~{R},4~{R})-3-(hydroxymethyl)-4-(4-methoxy-3-oxidanyl-phenyl)-1-(3,4,5-trimethoxyphenyl)azetidin-2-one'>93X</scene>, <scene name='pdbligand=ACP:PHOSPHOMETHYLPHOSPHONIC+ACID+ADENYLATE+ESTER'>ACP</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</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=5xag FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5xag OCA], [https://pdbe.org/5xag PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5xag RCSB], [https://www.ebi.ac.uk/pdbsum/5xag PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5xag ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TBA1B_BOVIN TBA1B_BOVIN] Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
A diverse of chiral beta-lactam bridged analogues of combretastatin A-4 (CA-4), 3-substituted 1,4-diaryl-2-azetidinones, were asymmetrically synthesized and biologically evaluated, leading to identify a number of potent anti-proliferative compounds represented by 14b and 14c with IC50 values of 0.001-0.021 muM, against four human cancer cell lines (A2780, Hela, SKOV-3 and MDA-MB-231). Structure-activity relationship (SAR) studies on all stereoisomers of 14b and 14c revealed that the absolute configurations of the chiral centers at 3- and 4-position were critically important for the activity and generally a trans configuration between the "A" and "B" rings is optimal. In addition, 14b and 14c displayed less cytotoxicity on normal human oviduct epithelial cells than malignant cells indicating good selectivity in vitro. Further biochemical evaluation and cocrystal structures with tubulin demonstrated that both compounds disrupted tubulin polymerization through interacting at the colchicine-binding site, suppressed angiogenesis in vitro and in vivo, blocked cell cycle progression at mitotic phase and induced cellular apoptosis. The in vivo assays verified that both compounds inhibited xenograft tumor growth in nude mice with acceptable therapeutic window, showing promising potentials for further clinical development.

Design, synthesis, biological evaluation and cocrystal structures with tubulin of chiral beta-lactam bridged combretastatin A-4 analogues as potent antitumor agents.,Zhou P, Liang Y, Zhang H, Jiang H, Feng K, Xu P, Wang J, Wang X, Ding K, Luo C, Liu M, Wang Y Eur J Med Chem. 2017 Dec 7;144:817-842. doi: 10.1016/j.ejmech.2017.12.004. PMID:29306206<ref>PMID:29306206</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5xag" style="background-color:#fffaf0;"></div>

==See Also==
*[[Stathmin-4 3D structures|Stathmin-4 3D structures]]
*[[Tubulin 3D Structures|Tubulin 3D Structures]]
*[[Tubulin tyrosine ligase|Tubulin tyrosine ligase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bos taurus]]
[[Category: Gallus gallus]]
[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Luo C]]
[[Category: Wang Y]]
[[Category: Zhang H]]