View source for 1h27

==CDK2/CYCLIN A IN COMPLEX WITH AN 11-RESIDUE RECRUITMENT PEPTIDE FROM P27==
<StructureSection load='1h27' size='340' side='right' caption='[[1h27]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1h27]] is a 5 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H27 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1H27 FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=TPO:PHOSPHOTHREONINE'>TPO</scene></td></tr>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1aq1|1aq1]], [[1b38|1b38]], [[1b39|1b39]], [[1buh|1buh]], [[1ckp|1ckp]], [[1di8|1di8]], [[1dm2|1dm2]], [[1e1v|1e1v]], [[1e1x|1e1x]], [[1e9h|1e9h]], [[1f5q|1f5q]], [[1fin|1fin]], [[1fq1|1fq1]], [[1fvt|1fvt]], [[1fvv|1fvv]], [[1g5s|1g5s]], [[1gih|1gih]], [[1gii|1gii]], [[1gij|1gij]], [[1gy3|1gy3]], [[1gz8|1gz8]], [[1h00|1h00]], [[1h01|1h01]], [[1h06|1h06]], [[1h07|1h07]], [[1h08|1h08]], [[1h0u|1h0u]], [[1h0v|1h0v]], [[1h0w|1h0w]], [[1h1p|1h1p]], [[1h1q|1h1q]], [[1h1r|1h1r]], [[1h1s|1h1s]], [[1h24|1h24]], [[1h25|1h25]], [[1h26|1h26]], [[1h28|1h28]], [[1hck|1hck]], [[1hcl|1hcl]], [[1jst|1jst]], [[1jsu|1jsu]], [[1jsv|1jsv]], [[1jvp|1jvp]], [[1ke5|1ke5]], [[1ke6|1ke6]], [[1ke7|1ke7]], [[1ke8|1ke8]], [[1ke9|1ke9]], [[1qmz|1qmz]]</td></tr>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1h27 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h27 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1h27 RCSB], [http://www.ebi.ac.uk/pdbsum/1h27 PDBsum]</span></td></tr>
<table>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/h2/1h27_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Progression through S phase of the eukaryotic cell cycle is regulated by the action of the cyclin dependent protein kinase 2 (CDK2) in association with cyclin A. CDK2/cyclin A phosphorylates numerous substrates. Substrate specificity often employs a dual recognition strategy in which the sequence flanking the phospho-acceptor site (Ser.Pro.X.Arg/Lys) is recognized by CDK2, while the cyclin A component of the complex contains a hydrophobic site that binds Arg/Lys.X.Leu ("RXL" or "KXL") substrate recruitment motifs. To determine additional sequence specificity motifs around the RXL sequence, we have performed X-ray crystallographic studies at 2.3 A resolution and isothermal calorimetry measurements on complexes of phospho-CDK2/cyclin A with a recruitment peptide derived from E2F1 and with shorter 11-mer peptides from p53, pRb, p27, E2F1, and p107. The results show that the cyclin recruitment site accommodates a second hydrophobic residue either immediately C-terminal or next adjacent to the leucine of the "RXL" motif and that this site makes important contributions to the recruitment peptide recognition. The arginine of the RXL motif contacts a glutamate, Glu220, on the cyclin. In those substrates that contain a KXL motif, no ionic interactions are observed with the lysine. The sequences N-terminal to the "RXL" motif of the individual peptides show no conservation, but nevertheless make common contacts to the cyclin through main chain interactions. Thus, the recruitment site is able to recognize diverse but conformationally constrained target sequences. The observations have implications for the further identification of physiological substrates of CDK2/cyclin A and the design of specific inhibitors.

Specificity determinants of recruitment peptides bound to phospho-CDK2/cyclin A.,Lowe ED, Tews I, Cheng KY, Brown NR, Gul S, Noble ME, Gamblin SJ, Johnson LN Biochemistry. 2002 Dec 31;41(52):15625-34. PMID:12501191<ref>PMID:12501191</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>

==See Also==
*[[Cell division protein kinase 2|Cell division protein kinase 2]]
*[[Cyclin|Cyclin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Brown, N R.]]
[[Category: Cheng, K Y.]]
[[Category: Gamblin, S.]]
[[Category: Gul, S.]]
[[Category: Johnson, L N.]]
[[Category: Lowe, E D.]]
[[Category: Noble, M E.M.]]
[[Category: Tews, I.]]
[[Category: Atp-binding]]
[[Category: Cdk2]]
[[Category: Cell cycle]]
[[Category: Cell division]]
[[Category: Cyclin]]
[[Category: Hydrolase-hydrolase inhibitor complex]]
[[Category: Mitosis]]
[[Category: Peptide specificity]]
[[Category: Phosphorylation]]
[[Category: Protein kinase]]
[[Category: Recruitment]]
[[Category: Serine/threonine-protein kinase]]