1yau
From Proteopedia
(New page: 200px<br /><applet load="1yau" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yau, resolution 2.40Å" /> '''Structure of Archeab...) |
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| - | [[Image:1yau.gif|left|200px]]<br /><applet load="1yau" size=" | + | [[Image:1yau.gif|left|200px]]<br /><applet load="1yau" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1yau, resolution 2.40Å" /> | caption="1yau, resolution 2.40Å" /> | ||
'''Structure of Archeabacterial 20S proteasome- PA26 complex'''<br /> | '''Structure of Archeabacterial 20S proteasome- PA26 complex'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Proteasomes are cylindrical structures that function in multiple cellular | + | Proteasomes are cylindrical structures that function in multiple cellular processes by degrading a wide variety of cytosolic and nuclear proteins. Substrate access and product release from the enclosed catalytic chamber occurs through axial pores that are opened by activator complexes. Here, we report high-resolution structures of wild-type and mutant archaeal proteasomes bound to the activator PA26. These structures support the proposal that an ordered open conformation is required for proteolysis and that its formation can be triggered by outward displacement of surrounding residues. The structures and associated biochemical assays reveal the mechanism of binding, which involves an interaction between the PA26 C terminus and a conserved lysine. Surprisingly, biochemical observations implicate an equivalent interaction for the unrelated ATP-dependent activators PAN and PA700. |
==About this Structure== | ==About this Structure== | ||
| - | 1YAU is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Thermoplasma_acidophilum Thermoplasma acidophilum] and [http://en.wikipedia.org/wiki/Trypanosoma_brucei Trypanosoma brucei] with SO4 and GOL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Proteasome_endopeptidase_complex Proteasome endopeptidase complex], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.25.1 3.4.25.1] Full crystallographic information is available from [http:// | + | 1YAU is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Thermoplasma_acidophilum Thermoplasma acidophilum] and [http://en.wikipedia.org/wiki/Trypanosoma_brucei Trypanosoma brucei] with <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=GOL:'>GOL</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Proteasome_endopeptidase_complex Proteasome endopeptidase complex], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.25.1 3.4.25.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YAU OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Trypanosoma brucei]] | [[Category: Trypanosoma brucei]] | ||
[[Category: Forster, A.]] | [[Category: Forster, A.]] | ||
| - | [[Category: Hill, C | + | [[Category: Hill, C P.]] |
| - | [[Category: Masters, E | + | [[Category: Masters, E I.]] |
[[Category: Robinson, H.]] | [[Category: Robinson, H.]] | ||
| - | [[Category: Whitby, F | + | [[Category: Whitby, F G.]] |
[[Category: GOL]] | [[Category: GOL]] | ||
[[Category: SO4]] | [[Category: SO4]] | ||
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[[Category: proteasome 20s]] | [[Category: proteasome 20s]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:03:26 2008'' |
Revision as of 14:03, 21 February 2008
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Structure of Archeabacterial 20S proteasome- PA26 complex
Overview
Proteasomes are cylindrical structures that function in multiple cellular processes by degrading a wide variety of cytosolic and nuclear proteins. Substrate access and product release from the enclosed catalytic chamber occurs through axial pores that are opened by activator complexes. Here, we report high-resolution structures of wild-type and mutant archaeal proteasomes bound to the activator PA26. These structures support the proposal that an ordered open conformation is required for proteolysis and that its formation can be triggered by outward displacement of surrounding residues. The structures and associated biochemical assays reveal the mechanism of binding, which involves an interaction between the PA26 C terminus and a conserved lysine. Surprisingly, biochemical observations implicate an equivalent interaction for the unrelated ATP-dependent activators PAN and PA700.
About this Structure
1YAU is a Protein complex structure of sequences from Thermoplasma acidophilum and Trypanosoma brucei with and as ligands. Active as Proteasome endopeptidase complex, with EC number 3.4.25.1 Full crystallographic information is available from OCA.
Reference
The 1.9 A structure of a proteasome-11S activator complex and implications for proteasome-PAN/PA700 interactions., Forster A, Masters EI, Whitby FG, Robinson H, Hill CP, Mol Cell. 2005 May 27;18(5):589-99. PMID:15916965
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