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{{STRUCTURE_4gue| PDB=4gue | SCENE= }}
==Structure of N-terminal kinase domain of RSK2 with flavonoid glycoside quercitrin==
===Structure of N-terminal kinase domain of RSK2 with flavonoid glycoside quercitrin===
<StructureSection load='4gue' size='340' side='right' caption='[[4gue]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
{{ABSTRACT_PUBMED_23385462}}
== Structural highlights ==
<table><tr><td colspan='2'>[[4gue]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4GUE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4GUE FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=QCT:2-(3,4-DIHYDROXYPHENYL)-5,7-DIHYDROXY-4-OXO-4H-CHROMEN-3-YL+6-DEOXY-ALPHA-L-MANNOPYRANOSIDE'>QCT</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3ubd|3ubd]], [[4el9|4el9]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Rps6ka3, Mapkapk1b, Rps6ka-rs1, Rsk2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 Mus musculus])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Non-specific_serine/threonine_protein_kinase Non-specific serine/threonine protein kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.1 2.7.11.1] </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=4gue FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gue OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4gue RCSB], [http://www.ebi.ac.uk/pdbsum/4gue PDBsum]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Members of the RSK family of kinases constitute attractive targets for drug design, but a lack of structural information regarding the mechanism of selective inhibitors impedes progress in this field. The crystal structure of the N-terminal kinase domain (residues 45-346) of mouse RSK2, or RSK2(NTKD), has recently been described in complex with one of only two known selective inhibitors, a rare naturally occurring flavonol glycoside, kaempferol 3-O-(3'',4''-di-O-acetyl-alpha-L-rhamnopyranoside), known as SL0101. Based on this structure, it was hypothesized that quercitrin (quercetin 3-O-alpha-L-rhamnopyranoside), a related but ubiquitous and inexpensive compound, might also act as an RSK inhibitor. Here, it is demonstrated that quercitrin binds to RSK2(NTKD) with a dissociation constant (K(d)) of 5.8 microM as determined by isothermal titration calorimetry, and a crystal structure of the binary complex at 1.8 A resolution is reported. The crystal structure reveals a very similar mode of binding to that recently reported for SL0101. Closer inspection shows a number of small but significant differences that explain the slightly higher K(d) for quercitrin compared with SL0101. It is also shown that quercitrin can effectively substitute for SL0101 in a biological assay, in which it significantly suppresses the contractile force in rabbit pulmonary artery smooth muscle in response to Ca(2+).


==Function==
Identification of quercitrin as an inhibitor of the p90 S6 ribosomal kinase (RSK): structure of its complex with the N-terminal domain of RSK2 at 1.8 A resolution.,Derewenda U, Artamonov M, Szukalska G, Utepbergenov D, Olekhnovich N, Parikh HI, Kellogg GE, Somlyo AV, Derewenda ZS Acta Crystallogr D Biol Crystallogr. 2013 Feb;69(Pt 2):266-75. doi:, 10.1107/S0907444912045520. Epub 2013 Jan 19. PMID:23385462<ref>PMID:23385462</ref>
[[http://www.uniprot.org/uniprot/KS6A3_MOUSE KS6A3_MOUSE]] Serine/threonine-protein kinase that acts downstream of ERK (MAPK1/ERK2 and MAPK3/ERK1) signaling and mediates mitogenic and stress-induced activation of the transcription factors CREB1, ETV1/ER81 and NR4A1/NUR77, regulates translation through RPS6 and EIF4B phosphorylation, and mediates cellular proliferation, survival, and differentiation by modulating mTOR signaling and repressing pro-apoptotic function of BAD and DAPK1. In fibroblast, is required for EGF-stimulated phosphorylation of CREB1 and histone H3 at 'Ser-10', which results in the subsequent transcriptional activation of several immediate-early genes. In response to mitogenic stimulation (EGF and PMA), phosphorylates and activates NR4A1/NUR77 and ETV1/ER81 transcription factors and the cofactor CREBBP. Upon insulin-derived signal, acts indirectly on the transcription regulation of several genes by phosphorylating GSK3B at 'Ser-9' and inhibiting its activity. Phosphorylates RPS6 in response to serum or EGF via an mTOR-independent mechanism and promotes translation initiation by facilitating assembly of the preinitiation complex. In response to insulin, phosphorylates EIF4B, enhancing EIF4B affinity for the EIF3 complex and stimulating cap-dependent translation. Is involved in the mTOR nutrient-sensing pathway by directly phosphorylating TSC2 at 'Ser-1798', which potently inhibits TSC2 ability to suppress mTOR signaling, and mediates phosphorylation of RPTOR, which regulates mTORC1 activity and may promote rapamycin-sensitive signaling independently of the PI3K/AKT pathway. Mediates cell survival by phosphorylating the pro-apoptotic proteins BAD and DAPK1 and suppressing their pro-apoptotic function. Promotes the survival of hepatic stellate cells by phosphorylating CEBPB in response to the hepatotoxin carbon tetrachloride (CCl4). Is involved in cell cycle regulation by phosphorylating the CDK inhibitor CDKN1B, which promotes CDKN1B association with 14-3-3 proteins and prevents its translocation to the nucleus and inhibition of G1 progression. In LPS-stimulated dendritic cells, is involved in TLR4-induced macropinocytosis, and in myeloma cells, acts as effector of FGFR3-mediated transformation signaling, after direct phosphorylation at Tyr-529 by FGFR3. Phosphorylates DAPK1 (By similarity).<ref>PMID:10856237</ref><ref>PMID:14504289</ref><ref>PMID:17785202</ref><ref>PMID:17906627</ref>  


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[4gue]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4GUE OCA].
</div>


==Reference==
==See Also==
<references group="xtra"/><references/>
*[[Ribosomal protein S6 kinase|Ribosomal protein S6 kinase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Mus musculus]]
[[Category: Mus musculus]]
[[Category: Non-specific serine/threonine protein kinase]]
[[Category: Non-specific serine/threonine protein kinase]]
[[Category: Derewenda, U.]]
[[Category: Derewenda, U]]
[[Category: Derewenda, Z S.]]
[[Category: Derewenda, Z S]]
[[Category: Szukalska, G.]]
[[Category: Szukalska, G]]
[[Category: Utepbergenov, D.]]
[[Category: Utepbergenov, D]]
[[Category: Serine/threonine kinase domain]]
[[Category: Serine/threonine kinase domain]]
[[Category: Transferase-transferase inhibitor complex]]
[[Category: Transferase-transferase inhibitor complex]]

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