1jwa
From Proteopedia
(New page: 200px<br /><applet load="1jwa" size="450" color="white" frame="true" align="right" spinBox="true" caption="1jwa, resolution 2.9Å" /> '''Structure of the ATP-...) |
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| - | [[Image:1jwa.jpg|left|200px]]<br /><applet load="1jwa" size=" | + | [[Image:1jwa.jpg|left|200px]]<br /><applet load="1jwa" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1jwa, resolution 2.9Å" /> | caption="1jwa, resolution 2.9Å" /> | ||
'''Structure of the ATP-bound MoeB-MoaD Protein Complex'''<br /> | '''Structure of the ATP-bound MoeB-MoaD Protein Complex'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The activation of ubiquitin and related protein modifiers is catalysed by | + | The activation of ubiquitin and related protein modifiers is catalysed by members of the E1 enzyme family that use ATP for the covalent self-attachment of the modifiers to a conserved cysteine. The Escherichia coli proteins MoeB and MoaD are involved in molybdenum cofactor (Moco) biosynthesis, an evolutionarily conserved pathway. The MoeB- and E1-catalysed reactions are mechanistically similar, and despite a lack of sequence similarity, MoaD and ubiquitin display the same fold including a conserved carboxy-terminal Gly-Gly motif. Similar to the E1 enzymes, MoeB activates the C terminus of MoaD to form an acyl-adenylate. Subsequently, a sulphurtransferase converts the MoaD acyl-adenylate to a thiocarboxylate that acts as the sulphur donor during Moco biosynthesis. These findings suggest that ubiquitin and E1 are derived from two ancestral genes closely related to moaD and moeB. Here we present the crystal structures of the MoeB-MoaD complex in its apo, ATP-bound, and MoaD-adenylate forms, and highlight the functional similarities between the MoeB- and E1-substrate complexes. These structures provide a molecular framework for understanding the activation of ubiquitin, Rub, SUMO and the sulphur incorporation step during Moco and thiamine biosynthesis. |
==About this Structure== | ==About this Structure== | ||
| - | 1JWA is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with ATP as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1JWA is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=ATP:'>ATP</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JWA OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
| - | [[Category: Lake, M | + | [[Category: Lake, M W.]] |
| - | [[Category: Rajagopalan, K | + | [[Category: Rajagopalan, K V.]] |
[[Category: Schindelin, H.]] | [[Category: Schindelin, H.]] | ||
| - | [[Category: Wuebbens, M | + | [[Category: Wuebbens, M M.]] |
[[Category: ATP]] | [[Category: ATP]] | ||
[[Category: moeb: modified rossmann fold; moad: ubiquitin-like fold]] | [[Category: moeb: modified rossmann fold; moad: ubiquitin-like fold]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:27:29 2008'' |
Revision as of 11:27, 21 February 2008
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Structure of the ATP-bound MoeB-MoaD Protein Complex
Overview
The activation of ubiquitin and related protein modifiers is catalysed by members of the E1 enzyme family that use ATP for the covalent self-attachment of the modifiers to a conserved cysteine. The Escherichia coli proteins MoeB and MoaD are involved in molybdenum cofactor (Moco) biosynthesis, an evolutionarily conserved pathway. The MoeB- and E1-catalysed reactions are mechanistically similar, and despite a lack of sequence similarity, MoaD and ubiquitin display the same fold including a conserved carboxy-terminal Gly-Gly motif. Similar to the E1 enzymes, MoeB activates the C terminus of MoaD to form an acyl-adenylate. Subsequently, a sulphurtransferase converts the MoaD acyl-adenylate to a thiocarboxylate that acts as the sulphur donor during Moco biosynthesis. These findings suggest that ubiquitin and E1 are derived from two ancestral genes closely related to moaD and moeB. Here we present the crystal structures of the MoeB-MoaD complex in its apo, ATP-bound, and MoaD-adenylate forms, and highlight the functional similarities between the MoeB- and E1-substrate complexes. These structures provide a molecular framework for understanding the activation of ubiquitin, Rub, SUMO and the sulphur incorporation step during Moco and thiamine biosynthesis.
About this Structure
1JWA is a Protein complex structure of sequences from Escherichia coli with as ligand. Full crystallographic information is available from OCA.
Reference
Mechanism of ubiquitin activation revealed by the structure of a bacterial MoeB-MoaD complex., Lake MW, Wuebbens MM, Rajagopalan KV, Schindelin H, Nature. 2001 Nov 15;414(6861):325-9. PMID:11713534
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