1p91
From Proteopedia
(New page: 200px<br /><applet load="1p91" size="450" color="white" frame="true" align="right" spinBox="true" caption="1p91, resolution 2.80Å" /> '''Crystal Structure of...) |
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| - | [[Image:1p91.gif|left|200px]]<br /><applet load="1p91" size=" | + | [[Image:1p91.gif|left|200px]]<br /><applet load="1p91" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1p91, resolution 2.80Å" /> | caption="1p91, resolution 2.80Å" /> | ||
'''Crystal Structure of RlmA(I) enzyme: 23S rRNA n1-G745 methyltransferase (NORTHEAST STRUCTURAL GENOMICS CONSORTIUM TARGET ER19)'''<br /> | '''Crystal Structure of RlmA(I) enzyme: 23S rRNA n1-G745 methyltransferase (NORTHEAST STRUCTURAL GENOMICS CONSORTIUM TARGET ER19)'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The RlmA class of enzymes (RlmA(I) and RlmA(II)) catalyzes N1-methylation | + | The RlmA class of enzymes (RlmA(I) and RlmA(II)) catalyzes N1-methylation of a guanine base (G745 in Gram-negative and G748 in Gram-positive bacteria) of hairpin 35 of 23S rRNA. We have determined the crystal structure of Escherichia coli RlmA(I) at 2.8-A resolution, providing 3D structure information for the RlmA class of RNA methyltransferases. The dimeric protein structure exhibits features that provide new insights into its molecular function. Each RlmA(I) molecule has a Zn-binding domain, responsible for specific recognition and binding of its rRNA substrate, and a methyltransferase domain. The asymmetric RlmA(I) dimer observed in the crystal structure has a well defined W-shaped RNA-binding cleft. Two S-adenosyl-l-methionine substrate molecules are located at the two valleys of the W-shaped RNA-binding cleft. The unique shape of the RNA-binding cleft, different from that of known RNA-binding proteins, is highly specific and structurally complements the 3D structure of hairpin 35 of bacterial 23S rRNA. Apart from the hairpin 35, parts of hairpins 33 and 34 also interact with the RlmA(I) dimer. |
==About this Structure== | ==About this Structure== | ||
| - | 1P91 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with ZN, SO4 and SAM as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/rRNA_(guanine-N(1)-)-methyltransferase rRNA (guanine-N(1)-)-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.51 2.1.1.51] Full crystallographic information is available from [http:// | + | 1P91 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=ZN:'>ZN</scene>, <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=SAM:'>SAM</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/rRNA_(guanine-N(1)-)-methyltransferase rRNA (guanine-N(1)-)-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.51 2.1.1.51] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1P91 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Das, K.]] | [[Category: Das, K.]] | ||
[[Category: Montelione, G.]] | [[Category: Montelione, G.]] | ||
| - | [[Category: NESG, Northeast | + | [[Category: NESG, Northeast Structural Genomics Consortium.]] |
[[Category: SAM]] | [[Category: SAM]] | ||
[[Category: SO4]] | [[Category: SO4]] | ||
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[[Category: structural genomics]] | [[Category: structural genomics]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:26:26 2008'' |
Revision as of 12:26, 21 February 2008
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Crystal Structure of RlmA(I) enzyme: 23S rRNA n1-G745 methyltransferase (NORTHEAST STRUCTURAL GENOMICS CONSORTIUM TARGET ER19)
Overview
The RlmA class of enzymes (RlmA(I) and RlmA(II)) catalyzes N1-methylation of a guanine base (G745 in Gram-negative and G748 in Gram-positive bacteria) of hairpin 35 of 23S rRNA. We have determined the crystal structure of Escherichia coli RlmA(I) at 2.8-A resolution, providing 3D structure information for the RlmA class of RNA methyltransferases. The dimeric protein structure exhibits features that provide new insights into its molecular function. Each RlmA(I) molecule has a Zn-binding domain, responsible for specific recognition and binding of its rRNA substrate, and a methyltransferase domain. The asymmetric RlmA(I) dimer observed in the crystal structure has a well defined W-shaped RNA-binding cleft. Two S-adenosyl-l-methionine substrate molecules are located at the two valleys of the W-shaped RNA-binding cleft. The unique shape of the RNA-binding cleft, different from that of known RNA-binding proteins, is highly specific and structurally complements the 3D structure of hairpin 35 of bacterial 23S rRNA. Apart from the hairpin 35, parts of hairpins 33 and 34 also interact with the RlmA(I) dimer.
About this Structure
1P91 is a Single protein structure of sequence from Escherichia coli with , and as ligands. Active as rRNA (guanine-N(1)-)-methyltransferase, with EC number 2.1.1.51 Full crystallographic information is available from OCA.
Reference
Crystal structure of RlmAI: implications for understanding the 23S rRNA G745/G748-methylation at the macrolide antibiotic-binding site., Das K, Acton T, Chiang Y, Shih L, Arnold E, Montelione GT, Proc Natl Acad Sci U S A. 2004 Mar 23;101(12):4041-6. Epub 2004 Mar 3. PMID:14999102
Page seeded by OCA on Thu Feb 21 14:26:26 2008
Categories: Escherichia coli | Single protein | RRNA (guanine-N(1)-)-methyltransferase | Acton, T. | Arnold, E. | Das, K. | Montelione, G. | NESG, Northeast Structural Genomics Consortium. | SAM | SO4 | ZN | 23s rrna | Er19 | G745 | Methyltransferase | Nesg | Northeast structural genomics consortium | Protein structure initiative | Psi | Rlma | Rrma | Structural genomics
