1x3z

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{{STRUCTURE_1x3z| PDB=1x3z | SCENE= }}
{{STRUCTURE_1x3z| PDB=1x3z | SCENE= }}
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'''Structure of a peptide:N-glycanase-Rad23 complex'''
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===Structure of a peptide:N-glycanase-Rad23 complex===
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==Overview==
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In eukaryotes, misfolded proteins must be distinguished from correctly folded proteins during folding and transport processes by quality control systems. Yeast peptide:N-glycanase (yPNGase) specifically deglycosylates the denatured form of N-linked glycoproteins in the cytoplasm and assists proteasome-mediated glycoprotein degradation by forming a complex with 26S proteasome through DNA repair protein, yRad23. Here, we describe the crystal structures of a yPNGase and XPC-binding domain of yRad23 (yRad23XBD, residues 238-309) complex and of a yPNGase-yRad23XBD complex bound to a caspase inhibitor, Z-VAD-fmk. yPNGase is formed with three domains, a core domain containing a Cys-His-Asp triad, a Zn-binding domain, and a Rad23-binding domain. Both N- and C-terminal helices of yPNGase interact with yRad23 through extensive hydrophobic interactions. The active site of yPNGase is located in a deep cleft that is formed with residues conserved in all PNGase members, and three sugar molecules are bound to this cleft. Complex structures in conjunction with mutational analyses revealed that the walls of the cleft block access to the active site of yPNGase by native glycoprotein, whereas the cleft is sufficiently wide to accommodate denatured glycoprotein, thus explaining the specificity of PNGase for denatured substrates.
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{{ABSTRACT_PUBMED_15964983}}
==About this Structure==
==About this Structure==
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[[Category: Yi, K J.]]
[[Category: Yi, K J.]]
[[Category: Protein-protein-inhibitor complex]]
[[Category: Protein-protein-inhibitor complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 14:29:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 14:04:24 2008''

Revision as of 11:04, 28 July 2008

Image:1x3z.png

Template:STRUCTURE 1x3z

Structure of a peptide:N-glycanase-Rad23 complex

Template:ABSTRACT PUBMED 15964983

About this Structure

1X3Z is a Protein complex structure of sequences from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Structure of a peptide:N-glycanase-Rad23 complex: insight into the deglycosylation for denatured glycoproteins., Lee JH, Choi JM, Lee C, Yi KJ, Cho Y, Proc Natl Acad Sci U S A. 2005 Jun 28;102(26):9144-9. Epub 2005 Jun 17. PMID:15964983

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