3e47 is a 28 chain structure with sequence from Saccharomyces cerevisiae. This structure supersedes the now removed PDB entry 2fny. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Most class I MHC ligands are generated from the vast majority of cellular proteins by proteolysis within the ubiquitin-proteasome pathway and are presented on the cell surface by MHC class I molecules. Here, we present the crystallographic analysis of yeast 20S proteasome in complex with the inhibitor homobelactosin C. The structure reveals a unique inhibitor-binding mode and provides information about the composition of proteasomal primed substrate-binding sites. IFN-gamma inducible substitution of proteasomal constitutive subunits by immunosubunits modulates characteristics of generated peptides, thus producing fragments with higher preference for binding to MHC class I molecules. The structural data for the proteasome:homobelactosin C complex provide an explanation for involvement of immunosubunits in antigen generation and open perspectives for rational design of ligands, inhibiting exclusively constitutive proteasomes or immunoproteasomes.
Inhibitor-binding mode of homobelactosin C to proteasomes: new insights into class I MHC ligand generation.,Groll M, Larionov OV, Huber R, de Meijere A Proc Natl Acad Sci U S A. 2006 Mar 21;103(12):4576-9. Epub 2006 Mar 13. PMID:16537370[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
↑ Groll M, Larionov OV, Huber R, de Meijere A. Inhibitor-binding mode of homobelactosin C to proteasomes: new insights into class I MHC ligand generation. Proc Natl Acad Sci U S A. 2006 Mar 21;103(12):4576-9. Epub 2006 Mar 13. PMID:16537370
