View source for 2brq


==Crystal structure of the filamin A repeat 21 complexed with the integrin beta7 cytoplasmic tail peptide==
<StructureSection load='2brq' size='340' side='right'caption='[[2brq]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2brq]] is a 4 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=2BRQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2BRQ 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]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=GSH:GLUTATHIONE'>GSH</scene></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=2brq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2brq OCA], [https://pdbe.org/2brq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2brq RCSB], [https://www.ebi.ac.uk/pdbsum/2brq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2brq ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/FLNA_HUMAN FLNA_HUMAN] Defects in FLNA are the cause of periventricular nodular heterotopia type 1 (PVNH1) [MIM:[https://omim.org/entry/300049 300049]; also called nodular heterotopia, bilateral periventricular (NHBP or BPNH). PVNH is a developmental disorder characterized by the presence of periventricular nodules of cerebral gray matter, resulting from a failure of neurons to migrate normally from the lateral ventricular proliferative zone, where they are formed, to the cerebral cortex. PVNH1 is an X-linked dominant form. Heterozygous females have normal intelligence but suffer from seizures and various manifestations outside the central nervous system, especially related to the vascular system. Hemizygous affected males die in the prenatal or perinatal period.<ref>PMID:16299064</ref> <ref>PMID:11532987</ref> <ref>PMID:12410386</ref> <ref>PMID:11914408</ref> <ref>PMID:15249610</ref>   Defects in FLNA are the cause of periventricular nodular heterotopia type 4 (PVNH4) [MIM:[https://omim.org/entry/300537 300537]; also known as periventricular heterotopia Ehlers-Danlos variant. PVNH4 is characterized by nodular brain heterotopia, joint hypermobility and development of aortic dilation in early adulthood.  Defects in FLNA are the cause of otopalatodigital syndrome type 1 (OPD1) [MIM:[https://omim.org/entry/311300 311300]. OPD1 is an X-linked dominant multiple congenital anomalies disease mainly characterized by a generalized skeletal dysplasia, mild mental retardation, hearing loss, cleft palate, and typical facial anomalies. OPD1 belongs to a group of X-linked skeletal dysplasias known as oto-palato-digital syndrome spectrum disorders that also include OPD2, Melnick-Needles syndrome (MNS), and frontometaphyseal dysplasia (FMD). Remodeling of the cytoskeleton is central to the modulation of cell shape and migration. FLNA is a widely expressed protein that regulates re-organization of the actin cytoskeleton by interacting with integrins, transmembrane receptor complexes and second messengers. Males with OPD1 have cleft palate, malformations of the ossicles causing deafness and milder bone and limb defects than those associated with OPD2. Obligate female carriers of mutations causing both OPD1 and OPD2 have variable (often milder) expression of a similar phenotypic spectrum.<ref>PMID:12612583</ref> <ref>PMID:15940695</ref>   Defects in FLNA are the cause of otopalatodigital syndrome type 2 (OPD2) [MIM:[https://omim.org/entry/304120 304120]; also known as cranioorodigital syndrome. OPD2 is a congenital bone disorder that is characterized by abnormally modeled, bowed bones, small or absent first digits and, more variably, cleft palate, posterior fossa brain anomalies, omphalocele and cardiac defects.  Defects in FLNA are the cause of frontometaphyseal dysplasia (FMD) [MIM:[https://omim.org/entry/305620 305620]. FMD is a congenital bone disease characterized by supraorbital hyperostosis, deafness and digital anomalies.<ref>PMID:12612583</ref> <ref>PMID:16596676</ref>   Defects in FLNA are the cause of Melnick-Needles syndrome (MNS) [MIM:[https://omim.org/entry/309350 309350]. MNS is a severe congenital bone disorder characterized by typical facies (exophthalmos, full cheeks, micrognathia and malalignment of teeth), flaring of the metaphyses of long bones, s-like curvature of bones of legs, irregular constrictions in the ribs, and sclerosis of base of skull.<ref>PMID:12612583</ref>   Defects in FLNA are the cause of X-linked congenital idiopathic intestinal pseudoobstruction (CIIPX) [MIM:[https://omim.org/entry/300048 300048]. CIIPX is characterized by a severe abnormality of gastrointestinal motility due to primary qualitative defects of enteric ganglia and nerve fibers. Affected individuals manifest recurrent signs of intestinal obstruction in the absence of any mechanical lesion.<ref>PMID:17357080</ref>   Defects in FLNA are the cause of FG syndrome type 2 (FGS2) [MIM:[https://omim.org/entry/300321 300321]. FG syndrome (FGS) is an X-linked disorder characterized by mental retardation, relative macrocephaly, hypotonia and constipation.<ref>PMID:17632775</ref>   Defects in FLNA are the cause of terminal osseous dysplasia (TOD) [MIM:[https://omim.org/entry/300244 300244]. A rare X-linked dominant male-lethal disease characterized by skeletal dysplasia of the limbs, pigmentary defects of the skin and recurrent digital fibroma during infancy. A significant phenotypic variability is observed in affected females.<ref>PMID:20598277</ref>   Defects in FLNA are the cause of cardiac valvular dysplasia X-linked (CVDX) [MIM:[https://omim.org/entry/314400 314400]. A rare X-linked heart disease characterized by mitral and/or aortic valve regurgitation. The histologic features include fragmentation of collagenous bundles within the valve fibrosa and accumulation of proteoglycans, which produces excessive valve tissue leading to billowing of the valve leaflets.<ref>PMID:17190868</ref>   Note=Defects in FLNA may be a cause of macrothrombocytopenia, a disorder characterized by subnormal levels of blood platelets. Blood platelets are abonormally enlarged.
== Function ==
[https://www.uniprot.org/uniprot/FLNA_HUMAN FLNA_HUMAN] Promotes orthogonal branching of actin filaments and links actin filaments to membrane glycoproteins. Anchors various transmembrane proteins to the actin cytoskeleton and serves as a scaffold for a wide range of cytoplasmic signaling proteins. Interaction with FLNA may allow neuroblast migration from the ventricular zone into the cortical plate. Tethers cell surface-localized furin, modulates its rate of internalization and directs its intracellular trafficking (By similarity). Involved in ciliogenesis.<ref>PMID:22121117</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/br/2brq_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=2brq ConSurf].
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== Publication Abstract from PubMed ==
The ability of adhesion receptors to transmit biochemical signals and mechanical force across cell membranes depends on interactions with the actin cytoskeleton. Filamins are large, actin-crosslinking proteins that connect multiple transmembrane and signaling proteins to the cytoskeleton. Here, we describe the high-resolution structure of an interface between filamin A and an integrin adhesion receptor. When bound, the integrin beta cytoplasmic tail forms an extended beta strand that interacts with beta strands C and D of the filamin immunoglobulin-like domain (IgFLN) 21. This interface is common to many integrins, and we suggest it is a prototype for other IgFLN domain interactions. Notably, the structurally defined filamin binding site overlaps with that of the integrin-regulator talin, and these proteins compete for binding to integrin tails, allowing integrin-filamin interactions to impact talin-dependent integrin activation. Phosphothreonine-mimicking mutations inhibit filamin, but not talin, binding, indicating that kinases may modulate this competition and provide additional means to control integrin functions.

The molecular basis of filamin binding to integrins and competition with talin.,Kiema T, Lad Y, Jiang P, Oxley CL, Baldassarre M, Wegener KL, Campbell ID, Ylanne J, Calderwood DA Mol Cell. 2006 Feb 3;21(3):337-47. PMID:16455489<ref>PMID:16455489</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2brq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Filamin 3D structures|Filamin 3D structures]]
*[[Integrin 3D structures|Integrin 3D structures]]
*[[User:Georg Mlynek/workbench|User:Georg Mlynek/workbench]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Kiema T-R]]
[[Category: Ylanne J]]