1j2p

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[[Image:1j2p.gif|left|200px]]
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{{Seed}}
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{{STRUCTURE_1j2p| PDB=1j2p | SCENE= }}
{{STRUCTURE_1j2p| PDB=1j2p | SCENE= }}
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'''alpha-ring from the proteasome from archaeoglobus fulgidus'''
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===alpha-ring from the proteasome from archaeoglobus fulgidus===
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==Overview==
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The 20S proteasome (core particle, CP) is a multifunctional protease complex and composed of four heptameric subunit rings arranged in a hollow, barrel-shaped structure. Here, we report the crystal structure of the CP from Archaeoglobus fulgidus at 2.25A resolution. The analysis of the structure of early and late assembly intermediates of this CP gives new insights in the maturation of archaebacterial CPs and indicates similarities to assembly intermediates observed in eukaryotes. We also show a striking difference in mechanism and regulation of substrate access between eukaryotic and archaebacterial 20S proteasomes. While eukaryotic CPs are auto-inhibited by the N-terminal tails of the outer alpha-ring by imposing topological closure with a characteristic sequence motif (YDR-motif) and show regulatory gating this segment is disordered in the CP and differently structured in the alpha(7)-sub-complex of A.fulgidus leaving a pore leading into the particle with a diameter of 13A. Mutagenesis and functional studies indicate the absence of regulatory gating in the archaeal 20S proteasome.
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(as it appears on PubMed at http://www.pubmed.gov), where 12614609 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12614609}}
==About this Structure==
==About this Structure==
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[[Category: Alpha-ring]]
[[Category: Alpha-ring]]
[[Category: Proteasome]]
[[Category: Proteasome]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:43:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 14:24:43 2008''

Revision as of 11:24, 1 July 2008

Image:1j2p.png

Template:STRUCTURE 1j2p

alpha-ring from the proteasome from archaeoglobus fulgidus

Template:ABSTRACT PUBMED 12614609

About this Structure

1J2P is a Single protein structure of sequence from Archaeoglobus fulgidus. Full crystallographic information is available from OCA.

Reference

Investigations on the maturation and regulation of archaebacterial proteasomes., Groll M, Brandstetter H, Bartunik H, Bourenkow G, Huber R, J Mol Biol. 2003 Mar 14;327(1):75-83. PMID:12614609

Page seeded by OCA on Tue Jul 1 14:24:43 2008

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