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.

4p1z

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 16:06, 16 November 2017

Structure of the MID domain from MIWI

Structural highlights

4p1z is a 4 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	Piwil1, Miwi (LK3 transgenic mice)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[PIWL1_MOUSE] Plays a central role during spermatogenesis by repressing transposable elements and preventing their mobilization, which is essential for the germline integrity. Acts via the piRNA metabolic process, which mediates the repression of transposable elements during meiosis by forming complexes composed of piRNAs and Piwi proteins and governs the methylation and subsequent repression of transposons. Directly binds methylated piRNAs, a class of 24 to 30 nucleotide RNAs that are generated by a Dicer-independent mechanism and are primarily derived from transposons and other repeated sequence elements. Besides their function in transposable elements repression, piRNAs are probably involved in other processes during meiosis such as translation regulation. Probable component of some RISC complex, which mediates RNA cleavage and translational silencing. Also plays a role in the formation of chromatoid bodies and is required for some miRNAs stability.^[1]

Publication Abstract from PubMed

Piwi-interacting RNAs (piRNAs) guide Piwi Argonautes to suppress transposon activity in animal gonads. Known piRNA populations are extremely complex, with millions of individual sequences present in a single organism. Despite this complexity, specific Piwi proteins incorporate piRNAs with distinct nucleotide- and transposon strand-biases (antisense or sense) of unknown origin. Here, we examined the contribution of structural domains in Piwi proteins toward defining these biases. We report the first crystal structure of the MID domain from a Piwi Argonaute and use docking experiments to show its ability to specify recognition of 5' uridine (1U-bias) of piRNAs. Mutational analyses reveal the importance of 5' end-recognition within the MID domain for piRNA biogenesis in vivo. Finally, domain-swapping experiments uncover an unexpected role for the MID-PIWI module of a Piwi protein in dictating the transposon strand-orientation of its bound piRNAs. Our work identifies structural features that allow distinguishing individual Piwi members during piRNA biogenesis.

The MID-PIWI module of Piwi proteins specifies nucleotide- and strand-biases of piRNAs.,Cora E, Pandey RR, Xiol J, Taylor J, Sachidanandam R, McCarthy AA, Pillai RS RNA. 2014 Apr 22. PMID:24757166^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Kuramochi-Miyagawa S, Kimura T, Yomogida K, Kuroiwa A, Tadokoro Y, Fujita Y, Sato M, Matsuda Y, Nakano T. Two mouse piwi-related genes: miwi and mili. Mech Dev. 2001 Oct;108(1-2):121-33. PMID:11578866
↑ Cora E, Pandey RR, Xiol J, Taylor J, Sachidanandam R, McCarthy AA, Pillai RS. The MID-PIWI module of Piwi proteins specifies nucleotide- and strand-biases of piRNAs. RNA. 2014 Apr 22. PMID:24757166 doi:http://dx.doi.org/10.1261/rna.044701.114

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4p1z"

@@ Line 1: / Line 1: @@
 ==Structure of the MID domain from MIWI==
 <StructureSection load='4p1z' size='340' side='right' caption='[[4p1z]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[4p1z]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4P1Z OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4P1Z FirstGlance]. <br>
+<table><tr><td colspan='2'>[[4p1z]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4P1Z OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4P1Z FirstGlance]. <br>
-</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=4p1z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4p1z OCA], [http://pdbe.org/4p1z PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4p1z RCSB], [http://www.ebi.ac.uk/pdbsum/4p1z PDBsum]</span></td></tr>
+</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Piwil1, Miwi ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</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=4p1z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4p1z OCA], [http://pdbe.org/4p1z PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4p1z RCSB], [http://www.ebi.ac.uk/pdbsum/4p1z PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4p1z ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 20: / Line 22: @@
 __TOC__
 </StructureSection>
+[[Category: Lk3 transgenic mice]]
 [[Category: Cora, E]]
 [[Category: McCarthy, A A]]

4p1z

From Proteopedia

Revision as of 16:06, 16 November 2017

Structure of the MID domain from MIWI

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox