1eqa

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[[Image:1eqa.gif|left|200px]]<br /><applet load="1eqa" size="350" color="white" frame="true" align="right" spinBox="true"
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[[Image:1eqa.gif|left|200px]]
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caption="1eqa, resolution 2.2&Aring;" />
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'''VACCINIA METHYLTRANSFERASE VP39 MUTANT E233Q COMPLEXED WITH M7G AND S-ADENOSYLHOMOCYSTEINE'''<br />
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{{Structure
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|PDB= 1eqa |SIZE=350|CAPTION= <scene name='initialview01'>1eqa</scene>, resolution 2.2&Aring;
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|SITE=
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|LIGAND= <scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene> and <scene name='pdbligand=MG7:7-METHYLGUANOSINE'>MG7</scene>
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|ACTIVITY= [http://en.wikipedia.org/wiki/Polynucleotide_adenylyltransferase Polynucleotide adenylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.19 2.7.7.19]
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|GENE=
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}}
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'''VACCINIA METHYLTRANSFERASE VP39 MUTANT E233Q COMPLEXED WITH M7G AND S-ADENOSYLHOMOCYSTEINE'''
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==Overview==
==Overview==
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==About this Structure==
==About this Structure==
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1EQA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Vaccinia_virus Vaccinia virus] with <scene name='pdbligand=SAH:'>SAH</scene> and <scene name='pdbligand=MG7:'>MG7</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Polynucleotide_adenylyltransferase Polynucleotide adenylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.19 2.7.7.19] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQA OCA].
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1EQA is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Vaccinia_virus Vaccinia virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQA OCA].
==Reference==
==Reference==
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mRNA cap recognition: dominant role of enhanced stacking interactions between methylated bases and protein aromatic side chains., Hu G, Gershon PD, Hodel AE, Quiocho FA, Proc Natl Acad Sci U S A. 1999 Jun 22;96(13):7149-54. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10377383 10377383]
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mRNA cap recognition: dominant role of enhanced stacking interactions between methylated bases and protein aromatic side chains., Hu G, Gershon PD, Hodel AE, Quiocho FA, Proc Natl Acad Sci U S A. 1999 Jun 22;96(13):7149-54. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10377383 10377383]
[[Category: Polynucleotide adenylyltransferase]]
[[Category: Polynucleotide adenylyltransferase]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: vaccinia]]
[[Category: vaccinia]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:30:26 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:58:59 2008''

Revision as of 08:58, 20 March 2008

Image:1eqa.gif


PDB ID 1eqa

Drag the structure with the mouse to rotate
, resolution 2.2Å
Ligands: and
Activity: Polynucleotide adenylyltransferase, with EC number 2.7.7.19
Coordinates: save as pdb, mmCIF, xml



VACCINIA METHYLTRANSFERASE VP39 MUTANT E233Q COMPLEXED WITH M7G AND S-ADENOSYLHOMOCYSTEINE


Overview

We have determined, by high resolution x-ray analysis, 10 structures comprising the mRNA cap-specific methyltransferase VP39 or specific mutants thereof in the presence of methylated nucleobase analogs (N1-methyladenine, N3-methyladenine, N1-methylcytosine, N3-methylcytosine) and their unmethylated counterparts, or nucleoside N7-methylguanosine. Together with solution affinity studies and previous crystallographic data for N7-methylguanosine and its phosphorylated derivatives, these data demonstrate that only methylated, positively charged bases are bound, indicating that their enhanced stacking with two aromatic side chains of VP39 (Tyr 22 and Phe 180) plays a dominant role in cap recognition. Four key features characterize this stacking interaction: (i) near perfect parallel alignment between the sandwiched methylated bases and aromatic side chains, (ii) substantial areas of overlap in the two-stacked rings, (iii) a 3.4-A interplanar spacing within the overlapping region, and (iv) positive charge in the heterocyclic nucleobase.

About this Structure

1EQA is a Single protein structure of sequence from Vaccinia virus. Full crystallographic information is available from OCA.

Reference

mRNA cap recognition: dominant role of enhanced stacking interactions between methylated bases and protein aromatic side chains., Hu G, Gershon PD, Hodel AE, Quiocho FA, Proc Natl Acad Sci U S A. 1999 Jun 22;96(13):7149-54. PMID:10377383

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