This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.


2i7t

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Current revision (09:02, 21 February 2024) (edit) (undo)
 
(13 intermediate revisions not shown.)
Line 1: Line 1:
-
[[Image:2i7t.jpg|left|200px]]<br /><applet load="2i7t" size="350" color="white" frame="true" align="right" spinBox="true"
 
-
caption="2i7t, resolution 2.10&Aring;" />
 
-
'''Structure of human CPSF-73'''<br />
 
-
==Overview==
+
==Structure of human CPSF-73==
-
Most eukaryotic messenger RNA precursors (pre-mRNAs) undergo extensive, maturational processing, including cleavage and polyadenylation at the, 3'-end. Despite the characterization of many proteins that are required, for the cleavage reaction, the identity of the endonuclease is not known., Recent analyses indicated that the 73-kDa subunit of cleavage and, polyadenylation specificity factor (CPSF-73) might be the endonuclease for, this and related reactions, although no direct data confirmed this. Here, we report the crystal structures of human CPSF-73 at 2.1 A resolution, complexed with zinc ions and a sulphate that might mimic the phosphate, group of the substrate, and the related yeast protein CPSF-100 (Ydh1) at, 2.5 A resolution. Both CPSF-73 and CPSF-100 contain two domains, a, metallo-beta-lactamase domain and a novel beta-CASP (named for, metallo-beta-lactamase, CPSF, Artemis, Snm1, Pso2) domain. The active site, of CPSF-73, with two zinc ions, is located at the interface of the two, domains. Purified recombinant CPSF-73 possesses RNA endonuclease activity, and mutations that disrupt zinc binding in the active site abolish this, activity. Our studies provide the first direct experimental evidence that, CPSF-73 is the pre-mRNA 3'-end-processing endonuclease.
+
<StructureSection load='2i7t' size='340' side='right'caption='[[2i7t]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
-
 
+
== Structural highlights ==
-
==About this Structure==
+
<table><tr><td colspan='2'>[[2i7t]] 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=2I7T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2I7T FirstGlance]. <br>
-
2I7T is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=ZN:'>ZN</scene> and <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2I7T OCA].
+
</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=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
-
==Reference==
+
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2i7t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i7t OCA], [https://pdbe.org/2i7t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2i7t RCSB], [https://www.ebi.ac.uk/pdbsum/2i7t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2i7t ProSAT]</span></td></tr>
-
Polyadenylation factor CPSF-73 is the pre-mRNA 3'-end-processing endonuclease., Mandel CR, Kaneko S, Zhang H, Gebauer D, Vethantham V, Manley JL, Tong L, Nature. 2006 Dec 14;444(7121):953-6. Epub 2006 Nov 26. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17128255 17128255]
+
</table>
 +
== Function ==
 +
[https://www.uniprot.org/uniprot/CPSF3_HUMAN CPSF3_HUMAN] Component of the cleavage and polyadenylation specificity factor (CPSF) complex that play a key role in pre-mRNA 3'-end formation, recognizing the AAUAAA signal sequence and interacting with poly(A) polymerase and other factors to bring about cleavage and poly(A) addition. Has endonuclease activity, and functions as mRNA 3'-end-processing endonuclease. Also involved in the histone 3'-end pre-mRNA processing. U7 snRNP-dependent protein that induces both the 3'-endoribonucleolytic cleavage of histone pre-mRNAs and acts as a 5' to 3' exonuclease for degrading the subsequent downstream cleavage product (DCP) of mature histone mRNAs. Cleavage occurs after the 5'-ACCCA-3' sequence in the histone pre-mRNA leaving a 3'hydroxyl group on the upstream fragment containing the stem loop (SL) and 5' phosphate on the downstream cleavage product (DCP) starting with CU nucleotides. The U7-dependent 5' to 3' exonuclease activity is processive and degrades the DCP RNA substrate even after complete removal of the U7-binding site. Binds to the downstream cleavage product (DCP) of histone pre-mRNAs and the cleaved DCP RNA substrate in a U7 snRNP dependent manner.<ref>PMID:14749727</ref> <ref>PMID:15037765</ref> <ref>PMID:18688255</ref> <ref>PMID:17128255</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/i7/2i7t_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=2i7t ConSurf].
 +
<div style="clear:both"></div>
 +
== References ==
 +
<references/>
 +
__TOC__
 +
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
-
[[Category: Single protein]]
+
[[Category: Large Structures]]
-
[[Category: Mandel, C.R.]]
+
[[Category: Mandel CR]]
-
[[Category: Tong, L.]]
+
[[Category: Tong L]]
-
[[Category: Zhang, H.]]
+
[[Category: Zhang H]]
-
[[Category: SO4]]
+
-
[[Category: ZN]]
+
-
[[Category: artemis]]
+
-
[[Category: double-strand break repair]]
+
-
[[Category: metallo-b-lactamase]]
+
-
[[Category: polyadenylation]]
+
-
[[Category: pre-mrna processing]]
+
-
[[Category: v(d)j recombination]]
+
-
 
+
-
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 17:35:12 2008''
+

Current revision

Structure of human CPSF-73

PDB ID 2i7t

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2i7t"
Personal tools