1rc5
From Proteopedia
(New page: 200px<br /><applet load="1rc5" size="450" color="white" frame="true" align="right" spinBox="true" caption="1rc5, resolution 2.30Å" /> '''CRYSTAL STRUCTURE OF...) |
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| - | [[Image:1rc5.gif|left|200px]]<br /><applet load="1rc5" size=" | + | [[Image:1rc5.gif|left|200px]]<br /><applet load="1rc5" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1rc5, resolution 2.30Å" /> | caption="1rc5, resolution 2.30Å" /> | ||
'''CRYSTAL STRUCTURE OF MG(II)-COMPLEX OF RNASE III ENDONUCLEASE DOMAIN FROM AQUIFEX AEOLICUS AT 2.30 ANGSTROM RESOLUTION'''<br /> | '''CRYSTAL STRUCTURE OF MG(II)-COMPLEX OF RNASE III ENDONUCLEASE DOMAIN FROM AQUIFEX AEOLICUS AT 2.30 ANGSTROM RESOLUTION'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Ribonuclease III (RNase III) represents a family of double-stranded RNA | + | Ribonuclease III (RNase III) represents a family of double-stranded RNA (dsRNA) endonucleases. The simplest bacterial enzyme contains an endonuclease domain (endoND) and a dsRNA binding domain (dsRBD). RNase III can affect RNA structure and gene expression in either of two ways: as a dsRNA-processing enzyme that cleaves dsRNA, or as a dsRNA binding protein that binds but does not cleave dsRNA. We previously determined the endoND structure of Aquifex aeolicus RNase III (Aa-RNase III) and modeled a catalytic complex of full-length Aa-RNase III with dsRNA. Here, we present the crystal structure of Aa-RNase III in complex with dsRNA, revealing a noncatalytic assembly. The major differences between the two functional forms of RNase III.dsRNA are the conformation of the protein and the orientation and location of dsRNA. The flexibility of a 7 residue linker between the endoND and dsRBD enables the transition between these two forms. |
==About this Structure== | ==About this Structure== | ||
| - | 1RC5 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus] with MG as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Ribonuclease_III Ribonuclease III], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.26.3 3.1.26.3] Full crystallographic information is available from [http:// | + | 1RC5 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus] with <scene name='pdbligand=MG:'>MG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Ribonuclease_III Ribonuclease III], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.26.3 3.1.26.3] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RC5 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: rnase iii]] | [[Category: rnase iii]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:49:22 2008'' |
Revision as of 12:49, 21 February 2008
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CRYSTAL STRUCTURE OF MG(II)-COMPLEX OF RNASE III ENDONUCLEASE DOMAIN FROM AQUIFEX AEOLICUS AT 2.30 ANGSTROM RESOLUTION
Overview
Ribonuclease III (RNase III) represents a family of double-stranded RNA (dsRNA) endonucleases. The simplest bacterial enzyme contains an endonuclease domain (endoND) and a dsRNA binding domain (dsRBD). RNase III can affect RNA structure and gene expression in either of two ways: as a dsRNA-processing enzyme that cleaves dsRNA, or as a dsRNA binding protein that binds but does not cleave dsRNA. We previously determined the endoND structure of Aquifex aeolicus RNase III (Aa-RNase III) and modeled a catalytic complex of full-length Aa-RNase III with dsRNA. Here, we present the crystal structure of Aa-RNase III in complex with dsRNA, revealing a noncatalytic assembly. The major differences between the two functional forms of RNase III.dsRNA are the conformation of the protein and the orientation and location of dsRNA. The flexibility of a 7 residue linker between the endoND and dsRBD enables the transition between these two forms.
About this Structure
1RC5 is a Single protein structure of sequence from Aquifex aeolicus with as ligand. Active as Ribonuclease III, with EC number 3.1.26.3 Full crystallographic information is available from OCA.
Reference
Noncatalytic assembly of ribonuclease III with double-stranded RNA., Blaszczyk J, Gan J, Tropea JE, Court DL, Waugh DS, Ji X, Structure. 2004 Mar;12(3):457-66. PMID:15016361
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