2ihx: Difference between revisions

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[[Image:2ihx.gif|left|200px]]
{{Seed}}
[[Image:2ihx.png|left|200px]]


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{{STRUCTURE_2ihx|  PDB=2ihx  |  SCENE=  }}  
{{STRUCTURE_2ihx|  PDB=2ihx  |  SCENE=  }}  


'''Solution Structure of the Rous Sarcoma Virus Nucleocapsid Protein:uPsi RNA Packaging Signal Complex'''
===Solution Structure of the Rous Sarcoma Virus Nucleocapsid Protein:uPsi RNA Packaging Signal Complex===




==Overview==
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The 5'-untranslated region (5'-UTR) of retroviral genomes contains elements required for genome packaging during virus assembly. For many retroviruses, the packaging elements reside in non-contiguous segments that span most or all of the 5'-UTR. The Rous sarcoma virus (RSV) is an exception, in that its genome can be packaged efficiently by a relatively short, 82 nt segment of the 5'-UTR called muPsi. The RSV 5'-UTR also contains three translational start codons (AUG-1, AUG-2 and AUG-3) that have been controvertibly implicated in translation initiation and genome packaging, one of which (AUG-3) resides within the muPsi sequence. We demonstrated recently that muPsi is capable of binding to the cognate RSV nucleocapsid protein (NC) with high affinity (dissociation constant K(d) approximately 2 nM), and that residues of AUG-3 are essential for tight binding. We now report the solution structure of the NC:muPsi complex, determined using NMR data obtained for samples containing ((13)C,(15)N)-labeled NC and (2)H-enriched, nucleotide-specifically protonated RNAs. Upon NC binding, muPsi adopts a stable secondary structure that consists of three stem loops (SL-A, SL-B and SL-C) and an 8 bp stem (O3). Binding is mediated by the two zinc knuckle domains of NC. The N-terminal knuckle interacts with a conserved U(217)GCG tetraloop (a member of the UNCG family; N=A,U,G or C), and the C-terminal zinc knuckle binds to residues that flank SL-A, including residues of AUG-3. Mutations of critical nucleotides in these sequences compromise or abolish viral infectivity. Our studies reveal novel structural features important for NC:RNA binding, and support the hypothesis that AUG-3 is conserved for genome packaging rather than translational control.
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==About this Structure==
==About this Structure==
2IHX is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rous_sarcoma_virus Rous sarcoma virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IHX OCA].  
2IHX is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rous_sarcoma_virus Rous sarcoma virus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IHX OCA].  


==Reference==
==Reference==
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[[Category: Zhou, J.]]
[[Category: Zhou, J.]]
[[Category: Protein-rna complex]]
[[Category: Protein-rna complex]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 07:31:33 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 10:37:23 2008''

Revision as of 07:37, 29 July 2008

File:2ihx.png

Template:STRUCTURE 2ihx

Solution Structure of the Rous Sarcoma Virus Nucleocapsid Protein:uPsi RNA Packaging Signal Complex

Template:ABSTRACT PUBMED 17070546

About this Structure

2IHX is a Single protein structure of sequence from Rous sarcoma virus. Full experimental information is available from OCA.

Reference

Solution structure of the Rous sarcoma virus nucleocapsid protein: muPsi RNA packaging signal complex., Zhou J, Bean RL, Vogt VM, Summers M, J Mol Biol. 2007 Jan 12;365(2):453-67. Epub 2006 Oct 10. PMID:17070546

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