1un6: Difference between revisions

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[[Image:1un6.jpg|left|200px]]
[[Image:1un6.png|left|200px]]


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==Overview==
{{ABSTRACT_14603324}}
Zinc-finger proteins of the classical Cys2His2 type are the most frequently used class of transcription factor and account for about 3% of genes in the human genome. The zinc-finger motif was discovered during biochemical studies on the transcription factor TFIIIA, which regulates the 5S ribosomal RNA genes of Xenopus laevis. Zinc-fingers mostly interact with DNA, but TFIIIA binds not only specifically to the promoter DNA, but also to 5S RNA itself. Increasing evidence indicates that zinc-fingers are more widely used to recognize RNA. There have been numerous structural studies on DNA binding, but none on RNA binding by zinc-finger proteins. Here we report the crystal structure of a three-finger complex with 61 bases of RNA, derived from the central regions of the complete nine-finger TFIIIA-5S RNA complex. The structure reveals two modes of zinc-finger binding, both of which differ from that in common use for DNA: first, the zinc-fingers interact with the backbone of a double helix; and second, the zinc-fingers specifically recognize individual bases positioned for access in otherwise intricately folded 'loop' regions of the RNA.


==About this Structure==
==About this Structure==
1UN6 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Xenopus_laevis Xenopus laevis]. The following page contains interesting information on the relation of 1UN6 with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb87_1.html Zinc Fingers]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UN6 OCA].  
1UN6 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Xenopus_laevis Xenopus laevis]. The following page contains interesting information on the relation of 1UN6 with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb87_1.html Zinc Fingers]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UN6 OCA].  
==Reference==
Crystal structure of a zinc-finger-RNA complex reveals two modes of molecular recognition., Lu D, Searles MA, Klug A, Nature. 2003 Nov 6;426(6962):96-100. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14603324 14603324]
[[Category: Single protein]]
[[Category: Single protein]]
[[Category: Xenopus laevis]]
[[Category: Xenopus laevis]]
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[[Category: X. laevi]]
[[Category: X. laevi]]
[[Category: Zinc finger]]
[[Category: Zinc finger]]
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