View source for 2na9


==Transmembrane Structure of the P441A Mutant of the Cytokine Receptor Common Subunit beta==
<StructureSection load='2na9' size='340' side='right'caption='[[2na9]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2na9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NA9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2NA9 FirstGlance]. <br>
</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=2na9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2na9 OCA], [https://pdbe.org/2na9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2na9 RCSB], [https://www.ebi.ac.uk/pdbsum/2na9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2na9 ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/IL3RB_HUMAN IL3RB_HUMAN] Defects in CSF2RB are the cause of pulmonary surfactant metabolism dysfunction type 5 (SMDP5) [MIM:[https://omim.org/entry/614370 614370]. SMDP5 is a rare lung disorder due to impaired surfactant homeostasis. It is characterized by alveolar filling with floccular material that stains positive using the periodic acid-Schiff method and is derived from surfactant phospholipids and protein components. Excessive lipoproteins accumulation in the alveoli results in severe respiratory distress.<ref>PMID:21075760</ref> 
== Function ==
[https://www.uniprot.org/uniprot/IL3RB_HUMAN IL3RB_HUMAN] High affinity receptor for interleukin-3, interleukin-5 and granulocyte-macrophage colony-stimulating factor.
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== Publication Abstract from PubMed ==
In many families of cell surface receptors, a single transmembrane (TM) alpha-helix separates ecto- and cytosolic domains. A defined coupling of ecto- and TM domains must be essential to allosteric receptor regulation but remains little understood. Here, we characterize the linker structure, dynamics and resulting ecto-TM domain coupling of integrin alphaIIb in model constructs and relate it to other integrin alpha subunits by mutagenesis. Cellular integrin activation assays subsequently validate the findings in intact receptors. Our results indicate a flexible yet carefully tuned ecto-TM coupling that sets the signaling threshold of integrin receptors. Interestingly, a proline at the N-terminal TM helix border, termed NBP, is critical to linker flexibility in integrins. NBP is further predicted in 21% of human single-pass TM proteins and validated in cytokine receptors by the TM domain structure of the cytokine receptor common subunit beta and its P441A-substituted variant. Thus, NBP is a conserved uncoupling motif of the ecto-TM domain transition and the degree of ecto-TM domain coupling represents an important parameter in the allosteric regulation of diverse cell surface receptors.

A Conserved Ectodomain-Transmembrane Domain Linker Motif Tunes the Allosteric Regulation of Cell Surface Receptors.,Schmidt T, Ye F, Situ AJ, An W, Ginsberg MH, Ulmer TS J Biol Chem. 2016 Jun 30. pii: jbc.M116.733683. PMID:27365391<ref>PMID:27365391</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2na9" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: An W]]
[[Category: Ginsberg MH]]
[[Category: Schmidt T]]
[[Category: Situ AJ]]
[[Category: Ulmer TS]]
[[Category: Ye F]]