1f38
From Proteopedia
(New page: 200px<br /><applet load="1f38" size="450" color="white" frame="true" align="right" spinBox="true" caption="1f38, resolution 2.4Å" /> '''X-RAY CRYSTALLOGRAPHI...) |
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| - | [[Image:1f38.gif|left|200px]]<br /><applet load="1f38" size=" | + | [[Image:1f38.gif|left|200px]]<br /><applet load="1f38" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1f38, resolution 2.4Å" /> | caption="1f38, resolution 2.4Å" /> | ||
'''X-RAY CRYSTALLOGRAPHIC STRUCTURE OF PRECORRIN 8W DECARBOXYLASE, THE PRODUCT OF GENE MT0146 IN THE METHANOBACTERIUM THERMOAUTOTROPHICUM GENOME'''<br /> | '''X-RAY CRYSTALLOGRAPHIC STRUCTURE OF PRECORRIN 8W DECARBOXYLASE, THE PRODUCT OF GENE MT0146 IN THE METHANOBACTERIUM THERMOAUTOTROPHICUM GENOME'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The CbiT and CbiE enzymes participate in the biosynthesis of vitamin B12. | + | The CbiT and CbiE enzymes participate in the biosynthesis of vitamin B12. They are fused together in some organisms to form a protein called CobL, which catalyzes two methylations and one decarboxylation on a precorrin intermediate. Because CbiE has sequence homology to canonical precorrin methyltransferases, CbiT was hypothesized to catalyze the decarboxylation. We herein present the crystal structure of MT0146, the CbiT homolog from Methanobacterium thermoautotrophicum. The protein shows structural similarity to Rossmann-like S-adenosyl-methionine-dependent methyltransferases, and our 1.9 A cocrystal structure shows that it binds S-adenosyl-methionine in standard geometry near a binding pocket that could accommodate a precorrin substrate. Therefore, MT0146/CbiT probably functions as a precorrin methyltransferase and represents the first enzyme identified with this activity that does not have the canonical precorrin methyltransferase fold. |
==About this Structure== | ==About this Structure== | ||
| - | 1F38 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Methanothermobacter_thermautotrophicus Methanothermobacter thermautotrophicus]. Full crystallographic information is available from [http:// | + | 1F38 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Methanothermobacter_thermautotrophicus Methanothermobacter thermautotrophicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F38 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Methanothermobacter thermautotrophicus]] | [[Category: Methanothermobacter thermautotrophicus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Hunt, J | + | [[Category: Hunt, J F.]] |
| - | [[Category: Keller, J | + | [[Category: Keller, J P.]] |
| - | [[Category: NESG, Northeast | + | [[Category: NESG, Northeast Structural Genomics Consortium.]] |
| - | [[Category: Smith, P | + | [[Category: Smith, P M.]] |
[[Category: decarboxylase]] | [[Category: decarboxylase]] | ||
[[Category: nesg]] | [[Category: nesg]] | ||
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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 12:34:19 2008'' |
Revision as of 10:34, 21 February 2008
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X-RAY CRYSTALLOGRAPHIC STRUCTURE OF PRECORRIN 8W DECARBOXYLASE, THE PRODUCT OF GENE MT0146 IN THE METHANOBACTERIUM THERMOAUTOTROPHICUM GENOME
Overview
The CbiT and CbiE enzymes participate in the biosynthesis of vitamin B12. They are fused together in some organisms to form a protein called CobL, which catalyzes two methylations and one decarboxylation on a precorrin intermediate. Because CbiE has sequence homology to canonical precorrin methyltransferases, CbiT was hypothesized to catalyze the decarboxylation. We herein present the crystal structure of MT0146, the CbiT homolog from Methanobacterium thermoautotrophicum. The protein shows structural similarity to Rossmann-like S-adenosyl-methionine-dependent methyltransferases, and our 1.9 A cocrystal structure shows that it binds S-adenosyl-methionine in standard geometry near a binding pocket that could accommodate a precorrin substrate. Therefore, MT0146/CbiT probably functions as a precorrin methyltransferase and represents the first enzyme identified with this activity that does not have the canonical precorrin methyltransferase fold.
About this Structure
1F38 is a Single protein structure of sequence from Methanothermobacter thermautotrophicus. Full crystallographic information is available from OCA.
Reference
The crystal structure of MT0146/CbiT suggests that the putative precorrin-8w decarboxylase is a methyltransferase., Keller JP, Smith PM, Benach J, Christendat D, deTitta GT, Hunt JF, Structure. 2002 Nov;10(11):1475-87. PMID:12429089
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