2h2j
From Proteopedia
(New page: 200px<br /><applet load="2h2j" size="450" color="white" frame="true" align="right" spinBox="true" caption="2h2j, resolution 2.45Å" /> '''Structure of Rubisco...) |
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| - | [[Image:2h2j.gif|left|200px]]<br /><applet load="2h2j" size=" | + | [[Image:2h2j.gif|left|200px]]<br /><applet load="2h2j" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2h2j, resolution 2.45Å" /> | caption="2h2j, resolution 2.45Å" /> | ||
'''Structure of Rubisco LSMT bound to Sinefungin and Monomethyllysine'''<br /> | '''Structure of Rubisco LSMT bound to Sinefungin and Monomethyllysine'''<br /> | ||
==Overview== | ==Overview== | ||
| - | SET domain enzymes represent a distinct family of protein lysine | + | SET domain enzymes represent a distinct family of protein lysine methyltransferases in eukaryotes. Recent studies have yielded significant insights into the structural basis of substrate recognition and the product specificities of these enzymes. However, the mechanism by which SET domain methyltransferases catalyze the transfer of the methyl group from S-adenosyl-L-methionine to the lysine epsilon-amine has remained unresolved. To elucidate this mechanism, we have determined the structures of the plant SET domain enzyme, pea ribulose-1,5 bisphosphate carboxylase/oxygenase large subunit methyltransferase, bound to S-adenosyl-L-methionine, and its non-reactive analogs Aza-adenosyl-L-methionine and Sinefungin, and characterized the binding of these ligands to a homolog of the enzyme. The structural and biochemical data collectively reveal that S-adenosyl-L-methionine is selectively recognized through carbon-oxygen hydrogen bonds between the cofactor's methyl group and an array of structurally conserved oxygens that comprise the methyl transfer pore in the active site. Furthermore, the structure of the enzyme co-crystallized with the product epsilon-N-trimethyllysine reveals a trigonal array of carbon-oxygen interactions between the epsilon-ammonium methyl groups and the oxygens in the pore. Taken together, these results establish a central role for carbon-oxygen hydrogen bonding in aligning the cofactor's methyl group for transfer to the lysine epsilon-amine and in coordinating the methyl groups after transfer to facilitate multiple rounds of lysine methylation. |
==About this Structure== | ==About this Structure== | ||
| - | 2H2J is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pisum_sativum Pisum sativum] with SFG and MLZ as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/[Ribulose-bisphosphate_carboxylase]-lysine_N-methyltransferase [Ribulose-bisphosphate carboxylase]-lysine N-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.127 2.1.1.127] Full crystallographic information is available from [http:// | + | 2H2J is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pisum_sativum Pisum sativum] with <scene name='pdbligand=SFG:'>SFG</scene> and <scene name='pdbligand=MLZ:'>MLZ</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/[Ribulose-bisphosphate_carboxylase]-lysine_N-methyltransferase [Ribulose-bisphosphate carboxylase]-lysine N-methyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.1.127 2.1.1.127] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2H2J OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: [Ribulose-bisphosphate carboxylase]-lysine N-methyltransferase]] | [[Category: [Ribulose-bisphosphate carboxylase]-lysine N-methyltransferase]] | ||
| - | [[Category: Couture, J | + | [[Category: Couture, J F.]] |
[[Category: Hauk, G.]] | [[Category: Hauk, G.]] | ||
| - | [[Category: Trievel, R | + | [[Category: Trievel, R C.]] |
[[Category: MLZ]] | [[Category: MLZ]] | ||
[[Category: SFG]] | [[Category: SFG]] | ||
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[[Category: set domain]] | [[Category: set domain]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:37:32 2008'' |
Revision as of 15:37, 21 February 2008
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Structure of Rubisco LSMT bound to Sinefungin and Monomethyllysine
Overview
SET domain enzymes represent a distinct family of protein lysine methyltransferases in eukaryotes. Recent studies have yielded significant insights into the structural basis of substrate recognition and the product specificities of these enzymes. However, the mechanism by which SET domain methyltransferases catalyze the transfer of the methyl group from S-adenosyl-L-methionine to the lysine epsilon-amine has remained unresolved. To elucidate this mechanism, we have determined the structures of the plant SET domain enzyme, pea ribulose-1,5 bisphosphate carboxylase/oxygenase large subunit methyltransferase, bound to S-adenosyl-L-methionine, and its non-reactive analogs Aza-adenosyl-L-methionine and Sinefungin, and characterized the binding of these ligands to a homolog of the enzyme. The structural and biochemical data collectively reveal that S-adenosyl-L-methionine is selectively recognized through carbon-oxygen hydrogen bonds between the cofactor's methyl group and an array of structurally conserved oxygens that comprise the methyl transfer pore in the active site. Furthermore, the structure of the enzyme co-crystallized with the product epsilon-N-trimethyllysine reveals a trigonal array of carbon-oxygen interactions between the epsilon-ammonium methyl groups and the oxygens in the pore. Taken together, these results establish a central role for carbon-oxygen hydrogen bonding in aligning the cofactor's methyl group for transfer to the lysine epsilon-amine and in coordinating the methyl groups after transfer to facilitate multiple rounds of lysine methylation.
About this Structure
2H2J is a Single protein structure of sequence from Pisum sativum with and as ligands. Active as [Ribulose-bisphosphate_carboxylase-lysine_N-methyltransferase [Ribulose-bisphosphate carboxylase]-lysine N-methyltransferase], with EC number 2.1.1.127 Full crystallographic information is available from OCA.
Reference
Catalytic roles for carbon-oxygen hydrogen bonding in SET domain lysine methyltransferases., Couture JF, Hauk G, Thompson MJ, Blackburn GM, Trievel RC, J Biol Chem. 2006 Jul 14;281(28):19280-7. Epub 2006 May 8. PMID:16682405[[Category: [Ribulose-bisphosphate carboxylase]-lysine N-methyltransferase]]
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