3c91

<StructureSection load='3c91' size='340' side='right' caption='[[3c91]], [[Resolution|resolution]] 6.80&Aring;' scene=''>

<table><tr><td colspan='2'>[[3c91]] is a 28 chain structure with sequence from [http://en.wikipedia.org/wiki/"thermoplasma_acidophila"_(sic)_darland_et_al._1970 "thermoplasma acidophila" (sic) darland et al. 1970]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3C91 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3C91 FirstGlance]. <br>

</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3c92|3c92]]</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[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] </span></td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3c91 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3c91 OCA], [http://pdbe.org/3c91 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3c91 RCSB], [http://www.ebi.ac.uk/pdbsum/3c91 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3c91 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/PSA_THEAC PSA_THEAC]] Component of the proteasome core, a large protease complex with broad specificity involved in protein degradation. The T.acidophilum proteasome is able to cleave oligopeptides after Tyr, Leu, Phe, and to a lesser extent after Glu and Arg. Thus, displays chymotrypsin-like activity and low level of caspase-like and trypsin-like activities.<ref>PMID:8999862</ref> [[http://www.uniprot.org/uniprot/PSB_THEAC PSB_THEAC]] Component of the proteasome core, a large protease complex with broad specificity involved in protein degradation. The T.acidophilum proteasome is able to cleave oligopeptides after Tyr, Leu, Phe, and to a lesser extent after Glu and Arg. Thus, displays chymotrypsin-like activity and low level of caspase-like and trypsin-like activities.<ref>PMID:8999862</ref>

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== Publication Abstract from PubMed ==

Substrates enter the cylindrical 20S proteasome through a gated channel that is regulated by the ATPases in the 19S regulatory particle in eukaryotes or the homologous PAN ATPase complex in archaea. These ATPases contain a conserved C-terminal hydrophobic-tyrosine-X (HbYX) motif that triggers gate opening upon ATP binding. Using cryo-electron microscopy, we identified the sites in the archaeal 20S where PAN's C-terminal residues bind and determined the structures of the gate in its closed and open forms. Peptides containing the HbYX motif bind to 20S in the pockets between neighboring alpha subunits where they interact with conserved residues required for gate opening. This interaction induces a rotation in the alpha subunits and displacement of a reverse-turn loop that stabilizes the open-gate conformation. This mechanism differs from that of PA26/28, which lacks the HbYX motif and does not cause alpha subunit rotation. These findings demonstrated how the ATPases' C termini function to facilitate substrate entry.

Mechanism of gate opening in the 20S proteasome by the proteasomal ATPases.,Rabl J, Smith DM, Yu Y, Chang SC, Goldberg AL, Cheng Y Mol Cell. 2008 May 9;30(3):360-8. PMID:18471981<ref>PMID:18471981</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 3c91" style="background-color:#fffaf0;"></div>

*[[Proteasome|Proteasome]]

</StructureSection>

[[Category: Proteasome endopeptidase complex]]

[[Category: Chang, S C]]

[[Category: Cheng, Y]]

[[Category: Goldberg, A L]]

[[Category: Rabl, J]]

[[Category: Smith, D M]]

[[Category: Yu, Y]]

[[Category: Threonine protease]]