View source for 6g33


==Crystal structure of CLK1 in complex with 5-iodotubercidin==
<StructureSection load='6g33' size='340' side='right' caption='[[6g33]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6g33]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6G33 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6G33 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=5ID:(2R,3R,4S,5R)-2-(4-AMINO-5-IODO-7H-PYRROLO[2,3-D]PYRIMIDIN-7-YL)-5-(HYDROXYMETHYL)TETRAHYDROFURAN-3,4-DIOL'>5ID</scene>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=SEP:PHOSPHOSERINE'>SEP</scene>, <scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CLK1, CLK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Dual-specificity_kinase Dual-specificity kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.12.1 2.7.12.1] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6g33 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6g33 OCA], [http://pdbe.org/6g33 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6g33 RCSB], [http://www.ebi.ac.uk/pdbsum/6g33 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6g33 ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/CLK1_HUMAN CLK1_HUMAN]] Dual specificity kinase acting on both serine/threonine and tyrosine-containing substrates. Phosphorylates serine- and arginine-rich (SR) proteins of the spliceosomal complex and may be a constituent of a network of regulatory mechanisms that enable SR proteins to control RNA splicing. Phosphorylates: SRSF1, SRSF3 and PTPN1. Regulates the alternative splicing of tissue factor (F3) pre-mRNA in endothelial cells and adenovirus E1A pre-mRNA.<ref>PMID:10480872</ref> <ref>PMID:19168442</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Prolonged drug residence times may result in longer lasting drug efficacy, improved pharmacodynamic properties and "kinetic selectivity" over off-targets with fast drug dissociation rates. However, few strategies have been elaborated to rationally modulate drug residence time and thereby to integrate this key property into the drug development process. Here, we show that the interaction between a halogen moiety on an inhibitor and an aromatic residue in the target protein can significantly increase inhibitor residence time. By using the interaction of the serine/threonine kinase haspin with 5-iodotubercidin (5-iTU) derivatives as a model for an archetypal active state (type I) kinase-inhibitor binding mode, we demonstrate that inhibitor residence times markedly increase with the size and polarizability of the halogen atom. This key interaction is dependent on the interactions with an aromatic residue in the gatekeeper position and we observe this interaction in other kinases with an aromatic gatekeeper residue. We provide a detailed mechanistic characterization of the halogen-aromatic pi interactions in the haspin-inhibitor complexes by means of kinetic, thermodynamic, and structural measurements along with binding energy calculations. Since halogens are frequently used in drugs and aromatic residues are often present in the binding sites of proteins, our results provide a compelling rationale for introducing aromatic-halogen interactions to prolong drug-target residence times.

Halogen-aromatic pi-interactions modulate inhibitor residence time.,Heroven C, Georgi V, Ganotra GK, Brennan PE, Wolfreys F, Wade RC, Fernandez-Montalvan AE, Chaikuad A, Knapp S Angew Chem Int Ed Engl. 2018 Mar 30. doi: 10.1002/anie.201801666. PMID:29601130<ref>PMID:29601130</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6g33" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dual specificity protein kinase|Dual specificity protein kinase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Dual-specificity kinase]]
[[Category: Human]]
[[Category: Arrowsmith, C H]]
[[Category: Bountra, C]]
[[Category: Chaikuad, A]]
[[Category: Edwards, A M]]
[[Category: Heroven, C]]
[[Category: Knapp, S]]
[[Category: Structural genomic]]
[[Category: Inhibitor]]
[[Category: Kinase]]
[[Category: Kinetic]]
[[Category: Sgc]]
[[Category: Slow off-rate]]
[[Category: Transferase]]