View source for 3bg1


==Architecture of a Coat for the Nuclear Pore Membrane==
<StructureSection load='3bg1' size='340' side='right' caption='[[3bg1]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3bg1]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824] and [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BG1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3BG1 FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3bg0|3bg0]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SEC13, D3S1231E, SEC13L1, SEC13R ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN]), NUP145, RAT10 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3bg1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bg1 OCA], [http://pdbe.org/3bg1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3bg1 RCSB], [http://www.ebi.ac.uk/pdbsum/3bg1 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3bg1 ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/SEC13_HUMAN SEC13_HUMAN]] Functions as a component of the nuclear pore complex (NPC) and the COPII coat. At the endoplasmic reticulum, SEC13 is involved in the biogenesis of COPII-coated vesicles.<ref>PMID:8972206</ref>  [[http://www.uniprot.org/uniprot/NU145_YEAST NU145_YEAST]] Functions as a component of the nuclear pore complex (NPC). NPC components, collectively referred to as nucleoporins (NUPs), can play the role of both NPC structural components and of docking or interaction partners for transiently associated nuclear transport factors. Active directional transport is assured by both, a Phe-Gly (FG) repeat affinity gradient for these transport factors across the NPC and a transport cofactor concentration gradient across the nuclear envelope (GSP1 and GSP2 GTPases associated predominantly with GTP in the nucleus, with GDP in the cytoplasm). NUP145 is autocatalytically cleaved in vivo in 2 polypeptides which assume different functions in the NPC. NUP145N as one of the FG repeat nucleoporins participates in karyopherin interactions and contains part of the autocatalytic cleavage activity. NUP145C as part of the NUP84 complex is involved in nuclear poly(A)+ RNA and tRNA export. It is also required for normal NPC distribution (probably through interactions with MLP1 and MLP2) and NPC assembly, as well as for normal nuclear envelope organization.<ref>PMID:8044840</ref> <ref>PMID:8195299</ref> <ref>PMID:8524308</ref> <ref>PMID:9305650</ref> <ref>PMID:10542288</ref> <ref>PMID:10638763</ref> <ref>PMID:11823431</ref> <ref>PMID:12604785</ref> <ref>PMID:15039779</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/bg/3bg1_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=3bg1 ConSurf].
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== Publication Abstract from PubMed ==
The symmetric core of the nuclear pore complex can be considered schematically as a series of concentric cylinders. A peripheral cylinder coating the pore membrane contains the previously characterized, elongated heptamer that harbors Sec13-Nup145C in its middle section. Strikingly, Sec13-Nup145C crystallizes as a hetero-octamer in two space groups. Oligomerization of Sec13-Nup145C was confirmed biochemically. Importantly, the numerous interacting surfaces in the hetero-octamer are evolutionarily highly conserved, further underlining the physiological relevance of the oligomerization. The hetero-octamer forms a slightly curved, yet rigid rod of sufficient length to span the entire height of the proposed membrane-adjacent cylinder. In concordance with the dimensions and symmetry of the nuclear pore complex core, we suggest that the cylinder is constructed of four antiparallel rings, each ring being composed of eight heptamers arranged in a head-to-tail fashion. Our model proposes that the hetero-octamer would vertically traverse and connect the four stacked rings.

Architecture of a coat for the nuclear pore membrane.,Hsia KC, Stavropoulos P, Blobel G, Hoelz A Cell. 2007 Dec 28;131(7):1313-26. PMID:18160040<ref>PMID:18160040</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 3bg1" style="background-color:#fffaf0;"></div>

==See Also==
*[[Nucleoporin|Nucleoporin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Atcc 18824]]
[[Category: Human]]
[[Category: Hoelz, A]]
[[Category: Autocatalytic cleavage]]
[[Category: Hydrolase]]
[[Category: Mrna transport]]
[[Category: Npc]]
[[Category: Nuclear pore complex]]
[[Category: Nucleus]]
[[Category: Phosphoprotein]]
[[Category: Protein transport]]
[[Category: Rna-binding]]
[[Category: Translocation]]
[[Category: Transport]]
[[Category: Wd repeat]]