View source for 2bqq


==X-ray Structure of the N-terminal Domain of Human Doublecortin==
<StructureSection load='2bqq' size='340' side='right'caption='[[2bqq]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2bqq]] is a 1 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=2BQQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2BQQ 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]] 2.2&#8491;</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=2bqq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2bqq OCA], [https://pdbe.org/2bqq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2bqq RCSB], [https://www.ebi.ac.uk/pdbsum/2bqq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2bqq ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/DCX_HUMAN DCX_HUMAN] Defects in DCX are the cause of lissencephaly X-linked type 1 (LISX1) [MIM:[https://omim.org/entry/300067 300067]; also called X-LIS or LIS. LISX1 is a classic lissencephaly characterized by mental retardation and seizures that are more severe in male patients. Affected boys show an abnormally thick cortex with absent or severely reduced gyri. Clinical manifestations include feeding problems, abnormal muscular tone, seizures and severe to profound psychomotor retardation. Female patients display a less severe phenotype referred to as 'doublecortex'.<ref>PMID:9489699</ref> <ref>PMID:9489700</ref> <ref>PMID:9668176</ref> <ref>PMID:9817918</ref> <ref>PMID:11468322</ref> <ref>PMID:12552055</ref>   Defects in DCX are the cause of subcortical band heterotopia X-linked (SBHX) [MIM:[https://omim.org/entry/300067 300067]; also known as double cortex or subcortical laminar heterotopia (SCLH). SBHX is a mild brain malformation of the lissencephaly spectrum. It is characterized by bilateral and symmetric plates or bands of gray matter found in the central white matter between the cortex and cerebral ventricles, cerebral convolutions usually appearing normal.<ref>PMID:9618162</ref> <ref>PMID:9989615</ref> <ref>PMID:10369164</ref> <ref>PMID:10441340</ref> <ref>PMID:10807542</ref> <ref>PMID:11601509</ref> <ref>PMID:11175293</ref> <ref>PMID:12390976</ref>   Note=A chromosomal aberration involving DCX is found in lissencephaly. Translocation t(X;2)(q22.3;p25.1).
== Function ==
[https://www.uniprot.org/uniprot/DCX_HUMAN DCX_HUMAN] Microtubule-associated protein required for initial steps of neuronal dispersion and cortex lamination during cerebral cortex development. May act by competing with the putative neuronal protein kinase DCLK1 in binding to a target protein. May in that way participate in a signaling pathway that is crucial for neuronal interaction before and during migration, possibly as part of a calcium ion-dependent signal transduction pathway. May be part with PAFAH1B1/LIS-1 of overlapping, but distinct, signaling pathways that promote neuronal migration.<ref>PMID:22359282</ref> 
== 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/bq/2bqq_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/main_output.php?pdb_ID=2bqq ConSurf].
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== Publication Abstract from PubMed ==
The doublecortin-like (DC) domains, which usually occur in tandem, constitute novel microtubule-binding modules. They were first identified in doublecortin (DCX), a protein expressed in migrating neurons, and in the doublecortin-like kinase (DCLK). They are also found in other proteins, including the RP1 gene product which-when mutated-causes a form of inherited blindness. We previously reported an X-ray structure of the N-terminal DC domain of DCLK (N-DCLK), and a solution structure of an analogous module of human doublecortin (N-DCX). These studies showed that the DC domain has a tertiary fold closely reminiscent of ubiquitin and similar to several GTPase-binding domains. We now report an X-ray structure of a mutant of N-DCX, in which the C-terminal fragment (residues 139-147) unexpectedly shows an altered, "open" conformation. However, heteronuclear NMR data show that this C-terminal fragment is only transiently open in solution, and assumes a predominantly "closed" conformation. While the "open" conformation may be artificially stabilized by crystal packing interactions, the observed switching between the "open" and "closed" conformations, which shortens the linker between the two DC-domains by approximately 20 A, is likely to be of functional importance in the control of tubulin polymerization and microtubule bundling by doublecortin.

The DC-module of doublecortin: dynamics, domain boundaries, and functional implications.,Cierpicki T, Kim MH, Cooper DR, Derewenda U, Bushweller JH, Derewenda ZS Proteins. 2006 Sep 1;64(4):874-82. PMID:16835924<ref>PMID:16835924</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Cooper DR]]
[[Category: Derewenda U]]
[[Category: Derewenda ZS]]
[[Category: Kim MH]]