1ihb

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[[Image:1ihb.gif|left|200px]]
 
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{{Structure
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==CRYSTAL STRUCTURE OF P18-INK4C(INK6)==
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|PDB= 1ihb |SIZE=350|CAPTION= <scene name='initialview01'>1ihb</scene>, resolution 1.95&Aring;
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<StructureSection load='1ihb' size='340' side='right'caption='[[1ihb]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1ihb]] 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=1IHB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IHB FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.95&#8491;</td></tr>
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|GENE= P18-INK4C(INK6) ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ihb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ihb OCA], [https://pdbe.org/1ihb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ihb RCSB], [https://www.ebi.ac.uk/pdbsum/1ihb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ihb ProSAT]</span></td></tr>
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|DOMAIN=
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</table>
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|RELATEDENTRY=
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== Function ==
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ihb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ihb OCA], [http://www.ebi.ac.uk/pdbsum/1ihb PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ihb RCSB]</span>
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[https://www.uniprot.org/uniprot/CDN2C_HUMAN CDN2C_HUMAN] Interacts strongly with CDK6, weakly with CDK4. Inhibits cell growth and proliferation with a correlated dependence on endogenous retinoblastoma protein RB.
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}}
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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'''CRYSTAL STRUCTURE OF P18-INK4C(INK6)'''
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ih/1ihb_consurf.spt"</scriptWhenChecked>
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==Overview==
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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p18INK4c is a member of a family of INK4 proteins that function to arrest the G1 to S cell cycle transition by inhibiting the activity of the cyclin-dependent kinases 4 and 6. The X-ray crystal structure of the human p18INK4c protein to a resolution of 1.95 A reveals an elongated molecule comprised of five contiguous 32- or 33-residue ankyrin-like repeat units. Each ankyrin-like repeat contains a beta-strand helix-turn-helix extended strand beta-strand motif that associates with neighboring motifs through beta-sheet, and helical bundle interactions. Conserved ankyrin-like repeat residues function to facilitate the ankyrin repeat fold and the tertiary interactions between neighboring repeat units. A large percentage of residues that are conserved among INK4 proteins and that map to positions of tumor-derived p16INK4 mutations play important roles in protein stability. A subset of these residues suggest an INK4 binding surface for the cyclin-dependent kinases 4 and 6. This surface is centered around a region that shows structural features uncharacteristic of ankyrin-like repeat units.
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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==About this Structure==
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</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/main_output.php?pdb_ID=1ihb ConSurf].
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1IHB is a [[Single protein]] structure of 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=1IHB OCA].
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<div style="clear:both"></div>
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__TOC__
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==Reference==
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</StructureSection>
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Crystal structure of the CDK4/6 inhibitory protein p18INK4c provides insights into ankyrin-like repeat structure/function and tumor-derived p16INK4 mutations., Venkataramani R, Swaminathan K, Marmorstein R, Nat Struct Biol. 1998 Jan;5(1):74-81. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9437433 9437433]
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[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Marmorstein, R.]]
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[[Category: Marmorstein R]]
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[[Category: Ravichandran, V.]]
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[[Category: Ravichandran V]]
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[[Category: Swaminathan, K.]]
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[[Category: Swaminathan K]]
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[[Category: ankyrin repeat]]
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[[Category: cdk 4/6 inhibitor]]
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[[Category: cell cycle inhibitor]]
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[[Category: p18-ink4c(ink6)]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:19:49 2008''
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Current revision

CRYSTAL STRUCTURE OF P18-INK4C(INK6)

PDB ID 1ihb

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